Said It Here

How to find a hidden engine oil leak spraying on components

When an engine oil leak sprays onto moving components like the CV joint, it covers surrounding areas and makes tracing the original source difficult. Even after replacing common problem spots like gaskets, the residual mess prevents drivers from easily identifying where the new or ongoing leak is originating.

Overview
People affected38 accounts across 3 forums
Workarounds found62 items attempted
Community agreement65 total upvotes

What the numbers show

Counted from the threads quoted below. How we count

  • Most of it landed at once — the busiest month was September 2026, with 29 people.
  • This comes up 9.6× more often in r/MechanicAdvice than across the site as a whole.

What people tried

Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.

62 items+ Contribute

Found another way around this?

Share your steps and trade-offs so fellow engineers don't have to reinvent the wheel. No account required.

  1. 1
    changing gaskets like the ivtech solenoid gaskets
    Did this help you?
  2. 2
    using a camera to inspect hard-to-reach areas under the hood
    Did this help you?
  3. 3
    swapping out a flattened drain plug washer
    Did this help you?
  4. 4
    Using luminescent UV dye in the oil with a black light
    Did this help you?
  5. 5
    Cleaning the engine bay thoroughly with brake cleaner and using paper towels to find fresh wet spots
    Did this help you?
  6. 6
    Tracing the oil trail to the highest point of the leak
    Did this help you?
  7. 7
    Replacing components like the oil pressure sending unit first
    Did this help you?
  8. 8
    Degreasing and cleaning the area before reobserving
    Did this help you?
  9. 9
    Tightening the sensor
    Did this help you?
  10. 10
    Asking for advice on online forums before visiting a mechanic
    Did this help you?
  11. 11
    Dabbing fluid on a white paper towel to compare oil versus power steering fluid spread
    Did this help you?
  12. 12
    Inspecting the valve covers and power steering components manually
    Did this help you?
  13. 13
    Replace the valve cover gasket and spark plug tube seals
    Did this help you?
  14. 14
    Checking oil levels regularly
    Did this help you?
  15. 15
    Tightening the valve cover
    Did this help you?
  16. 16
    Replacing and properly torquing the valve cover gasket
    Did this help you?
  17. 17
    topping off coolant
    Did this help you?
  18. 18
    replacing hoses
    Did this help you?
  19. 19
    Tightening loose valve cover bolts
    Did this help you?
  20. 20
    Keeping an eye on fluid levels and watching for signs of drips
    Did this help you?
  21. 21
    Replacing hardened valve cover gaskets
    Did this help you?
  22. 22
    Taking the vehicle to a local shop
    Did this help you?
  23. 23
    Reassembling components to test for leaks
    Did this help you?
  24. 24
    Inspect the engine area for grime and potential alternative leak sources before doing repairs.
    Did this help you?
  25. 25
    Buying oil to fill the engine back up and running it briefly to locate the leak
    Did this help you?
  26. 26
    Having a parts store or mechanic test the charging system to check the alternator
    Did this help you?
  27. 27
    inspecting the valve cover gasket or sensors for leaks
    Did this help you?
  28. 28
    cleaning off caked-on oil sludge
    Did this help you?
  29. 29
    Replacing the upper timing cover seals, gaskets, and adjuster solenoid o-ring.
    Did this help you?
  30. 30
    Cleaning or wiping off the residue to see if it returns
    Did this help you?
  31. 31
    Checking for underlying mechanical leaks
    Did this help you?
  32. 32
    Cleaning the engine with degreaser and checking again after a week
    Did this help you?
  33. 33
    Looking underneath the vehicle first before diagnosing the top
    Did this help you?
  34. 34
    Taking the car to a professional mechanic
    Did this help you?
  35. 35
    Cleaning the area first to monitor where the drips are coming from
    Did this help you?
  36. 36
    Checking under the car for oil drops and stains
    Did this help you?
  37. 37
    Posting photos and vehicle details online for mechanic advice
    Did this help you?
  38. 38
    Using UV dye and a UV flashlight to spot hidden leaks
    Did this help you?
  39. 39
    Waiting a full week of driving before declaring victory
    Did this help you?
  40. 40
    Spraying down oil-soaked areas with brake clean to isolate new leaks
    Did this help you?
  41. 41
    Cleaning the whole area with brake cleaner and dusting with aerosol foot powder or cornstarch to trace the oil trail
    Did this help you?
  42. 42
    Accepting a slow oil drip as character over years
    Did this help you?
  43. 43
    Taking the vehicle to a repair shop for diagnosis and gasket replacements
    Did this help you?
  44. 44
    Wiping away pooled oil under the hood to observe where it reappears after starting the engine
    Did this help you?
  45. 45
    Checking the top of the engine and working down
    Did this help you?
  46. 46
    Inspecting for potential rear main seal leaks
    Did this help you?
  47. 47
    Replacing valve cover gaskets and power steering o-rings
    Did this help you?
  48. 48
    Inspecting timing belt cavities and buying specific replacement brand seals
    Did this help you?
  49. 49
    Took the car to a mechanic to get valve covers replaced
    Did this help you?
  50. 50
    Replacing valve covers and gaskets
    Did this help you?
  51. 51
    diagnose it as a bad gasket and replace it
    Did this help you?
  52. 52
    get rid of the car and buy a more reliable brand
    Did this help you?
  53. 53
    Asking mechanics on forums to visually identify the leak from photos or videos
    Did this help you?
  54. 54
    Researching common leak points for their specific vehicle model
    Did this help you?
  55. 55
    Look around the engine bay to spot 'gunk' where it shouldn't be.
    Did this help you?
  56. 56
    Look up examples of the specific car model on YouTube.
    Did this help you?
  57. 57
    Take the car to a mechanic to get it checked out professionally.
    Did this help you?
  58. 58
    Cleaning the area with brake cleaner and dusting it with talcum powder or flour to trace the leak
    Did this help you?
  59. 59
    Checking the oil pan gasket up front where it meets the timing cover
    Did this help you?
  60. 60
    Checking the valve cover gasket at the back corner
    Did this help you?
  61. 61
    tightening the oil filter or cover further in hopes of stopping the leak
    Did this help you?
  62. 62
    Posting pictures of the engine bay on a forum to get opinions from others.
    Did this help you?
Tried another approach not listed above?+ Share your workaround ↑

In their words

Unedited, grouped by where they were said, most upvoted first within each place, each linked to the thread it came from.

r/MechanicAdvice25 people · September 2026 – November 2026

“Its runs completely normal, but over the last months i have noticed this white stuff leaking out the tube at two points. Its been building up for quite some time now, and i am getting a bit worried”source ↗

“Repairs on this car are usully quite expensics, so before bringing it to a mechanic and consequently not eating for a month i wanted to ask if its a serious and urgent repair?”source ↗

nKRyptON · r/MechanicAdvice · 6 upvotes

“There’s oil leaking from a specific point between the block and the head just under the exhaust manifold.”source ↗

“Can someone just confirm that is likely a head gasket failure?”source ↗

“I’m already struggling with overheating issues but have no other head gasket failure symptoms.”source ↗

Goopiestgoblin · r/MechanicAdvice · 5 upvotes

“My car is leaking oil. There isn’t any on the driveway or splash guard. my timing chain cover though is oily. would this be the culprit?”source ↗

ogterry23 · r/MechanicAdvice · 4 upvotes

“Was chasing an oil leak onto the CV joint and spraying everywhere which makes it hard.”source ↗

“Changed the ivtech solenoid gaskets. Still there.”source ↗

“Put my camera down there… am I screwed?”source ↗

packardhewlett · r/MechanicAdvice · 3 upvotes

“Last I checked (about a week or so ago) that it had burnt oil more than usual, since it was almost 1/2.”source ↗

Swamp_Mouth · r/MechanicAdvice · 3 upvotes

“I wanted to see if it’s normal for this age of the car or it’s a leakage that can be fixed”source ↗

Suspicious-While5713 · r/MechanicAdvice · 2 upvotes

“1999 dodge Dakota sport slow oil leak. Just wondering if there’s any advice or easy fix/way to slow it.”source ↗

Acrobatic-Network566 · r/MechanicAdvice · 1 upvotes

“Hey guys, I’m having a hard time trying to figure out where I have this oil leak from, on my 1997 Honda civic ex coupe with the d16y8, it looks like it’s coming from around alternator bracket or above it I’m not sure if anyone can guide me to what seals/gaskets are around this area cause I already fixed my camshaft seal and it’s doesn’t look like it’s coming from the crankshaft either maybe it’s my oil pan leaking but I’m not sure, and it’s not leaking from the valve cover either cause I just recently replaced it and it would be easily visible.”source ↗

WeirdCauliflower6494 · r/MechanicAdvice · 1 upvotes

“I've since replaced the radiator and the car runs fine, but it has a leak and perhaps it overheating is what caused it.”source ↗

Tier3Games · r/MechanicAdvice · 1 upvotes

“I actually just looked at the driver side valve cover through the wheel well and it does appear it's a lot more wet than normal.”source ↗

Tier3Games · r/MechanicAdvice · 1 upvotes

“I was changing the spark plugs on my 2009 Chevy trailblazer 4.2L and found oil pooled on the 5th plug.”source ↗

BigBiff1999 · r/MechanicAdvice · 1 upvotes

“Found older grimy oil on back of engine.”source ↗

“Just curious.”source ↗

Altruistic-Ant-629 · r/MechanicAdvice · 1 upvotes

“I have a 01 tundra that i had to tighten them down because they where leaking”source ↗

Exotic-Leading3608 · r/MechanicAdvice · 1 upvotes

“Huge oil leak on 2009 chevy 1500 (heavily modified).”source ↗

“It was pouring oil near the bell housing so my thought was Crank sensor or rear main seal.”source ↗

“does a loose oil filter and bad valve cover seal make sense with this mess to any of you guys?”source ↗

Iamalittlelamb · r/MechanicAdvice · 1 upvotes

“No. It looked empty when I checked it. I just did an oil change a month ago, so it should have been full. I was thinking about buying some oil to fill it back up today and running it for a few minutes to see if I can pinpoint the leak.”source ↗

Kirkwilhelm234 · r/MechanicAdvice · 1 upvotes

“I was also wondering if the timing chain cover came with the seals/gaskets or if I should purchase separately.”source ↗

ogterry23 · r/MechanicAdvice · 1 upvotes

“I had a detailed that cleaned under the hood and harder he used left that residue”source ↗

RR50 · r/MechanicAdvice · 1 upvotes

“About two days after, I started noticing a metallic buzzing sound after I drive off shortly after starting the car. (It only lasts for a few seconds after I drive off) When I arrived home, I checked under my car and noticed some oil drops and looked under the car on the driver side towards the back and saw the oil stain you see in the pic. Can someone tell me where the oil is leaking from and what I’m most likely dealing with here?”source ↗

thedudeofyork · r/MechanicAdvice · 1 upvotes

“I was fueling up and a stranger pointed out some smoke was coming from my hood near the back (near windshield).”source ↗

“After opening it up I noticed that some of this fluff/insulation? From the cover was touching some leaking oil (presumably).”source ↗

“I removed the cover and noticed all along the back of the engine was caked in oily grime.”source ↗

“Could this just be the engine valve cover or am I royally screwed?”source ↗

SerKiljerk · r/MechanicAdvice · 1 upvotes

“I am still skeptical its leaking somewhere but its been 2 days since I changed the VVT gasket and no leak so far… but I can sense it. You know?”source ↗

nyxflare · r/MechanicAdvice · 1 upvotes

“Am I leaking oil? If so can you help identify where”source ↗

Crazy4CarCamping · r/MechanicAdvice · 1 upvotes

“I fought the same slow drip on my old Cobalt for two years before I just accepted it as character.”source ↗

“Fresh oil on old oil tells you nothing useful.”source ↗

the_MaterialPeacock · r/MechanicAdvice · 1 upvotes

“How do I go about finding the leak? Do i clean around the gasket first and see if anything comes out after a week?”source ↗

Swamp_Mouth · r/MechanicAdvice · 1 upvotes

“I replaced clutch and rear main, only to find it was still leaking afterwards.”source ↗

“For good measure I replaced the rear main again thinking maybe a bad seal. But nope, still leaking.”source ↗

“I'm just wondering before I go back in there, if there was any other places these engines can leak out of inside the bell housing?”source ↗

“I'm losing about 1.5 litres a week, and it's getting quite pricey to run.”source ↗

hishon01 · r/MechanicAdvice · 1 upvotes

“it has a decent oil leak around the back passenger side of the engine. I was thinking valve cover gasket but not sure if those commonly go bad.”source ↗

“took these pics to hopefully get a better idea of what is leaking.”source ↗

Roe_127 · r/MechanicAdvice · 1 upvotes

“Can anybody give me a clue as to where this leak is coming from? I think its the oil filter housing or oil temp sensor but there oil all around the area so Im lost.”source ↗

“When I let the engine run I cannot see any obvious leaking”source ↗

Purple-Fishing-636 · r/MechanicAdvice

“Possibly paranoid but it leaks down the rear of the engine as well I just want to make sure while I'm in here that the crank isn't leaking too j35z6”source ↗

Loadedpotato11 · r/MechanicAdvice

“How serious is this? Is it a seep, weep, leak, oil vapor weep collecting road dust or does gm consider this normal for a 2.5 ecotec?”source ↗

Patty_Cheeze · r/MechanicAdvice
r/AskMechanics12 people · September 2026 – November 2026

“Anyone able to help with identifying where this oil leak is coming from?”source ↗

“so far I've had a shop replace the oil filter adapter gasket, oil pressure switch and the valve cover gasket set. noticed leaks again on the ground yesterday.”source ↗

“I went under the hood today and noticed oil pooling in the pictured area. I wiped it away but after starting the vehicle it immediately pooled again.”source ↗

HeroicVillain721 · r/AskMechanics · 5 upvotes

“So, it’s been a minute since it started leaking some oil from under the transmission. Should I replace the whole thing?”source ↗

AdministrativeLie822 · r/AskMechanics · 4 upvotes

“Have a coolant leak and haven’t been able to trace it to a specific spot. Have this area inside the engine bay that’s wet. It has pooled up on the splash guard under the frame.”source ↗

justin2363 · r/AskMechanics · 2 upvotes

“Goes through a lot of oil and there’s occasional burny smells in the cabin. Am I correct in my diagnosis?”source ↗

buttcheeksouffle · r/AskMechanics · 2 upvotes

“Found an oil leak on my oil filter. It seems to have gathered on the tip of the oil filter cover but I can’t seem to located exactly where it is leaking from.”source ↗

“Should I just tighten it even more?”source ↗

Rich-Fact-3366 · r/AskMechanics · 2 upvotes

“I ordered parts to start replacing my valve cover but the more I look at it the less I’m sure if the valve covers are even leaking.”source ↗

Agitated_Cell_7041 · r/AskMechanics · 1 upvotes

“It's on the front side of the block. The sludge is caked on oil. It's been leaking oil for a while obviously. I assume the smoke is from hot oil, but why?”source ↗

mob19151 · r/AskMechanics · 1 upvotes

“I have no idea how to diagnose or even maintain a car. Complete beginner 🙌”source ↗

AdministrativeLie822 · r/AskMechanics · 1 upvotes

“Looks like oil but from where is it leaking?”source ↗

Acrobatic_Tower1712 · r/AskMechanics · 1 upvotes

“Not sure since there’s a lot of oil present”source ↗

EbbWilling3845 · r/AskMechanics · 1 upvotes

“over the past year or so, I've been having an oil leak from somewhere. This mainly happens after driving at 60 mph or above for extended periods of time 1.5-2+ hrs. So much so that when I stop, the oil leaks onto the exhaust and tends to smoke under the hood”source ↗

“I took it to a mechanic and was advised to replace my valve covers. I did that, but it still leaks, perhaps not as much as before but she's still leaking oil from somewhere.”source ↗

sam-mcg-music · r/AskMechanics · 1 upvotes

“The leak still persists.”source ↗

Camera_of_the_west · r/AskMechanics · 1 upvotes

“somebody please tell me where this leak is coming from.”source ↗

AsleepGoose7474 · r/AskMechanics · 1 upvotes
r/autorepair1 person · September 2026

“I was filling it up w coolant and heard DRIPPING.”source ↗

renry_hollins · r/autorepair

Where this came up

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