petro found in engine oil sample

Asked by GuruXDQ77 Oct 02, 2018 at 05:34 AM about the 2002 Nissan Cedric Y34

Question type: Maintenance & Repair

my car could not start and when i took the oil deep stick i found that it was more than the required level. and i drained and saw that te petro was mixed with oil instead i drained about 12 litres of mixed petro and oil. then i put new oil and the engine run for 1 month and it happened again. so i did it for 3 times and what could be the reason for this

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Hornet_2497 answered 5 years ago

There might be unburned fuel running past the pistons during misfire and ending up in the crankcase...motor oil. So make sure you plugs and spark are good. Actually, if it runs smoothly, they are probably okay. And sometimes a fuel pressure regulator, the kind with a vacuum line attached, will rupture and allow petro (gasoline) to get sucked into the engine and oil. Also scan for codes. Maybe an evaporator purge valve is drawing petro into the engine oil. Good Luck

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F_O_R answered 5 years ago

Possible leaking fuel injector. I would pull the spark plugs and inspect them.

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