2001 Chevy Silverado 1500 4.3 milky oil after sitting for 7 months

[Dee Hugh]

Is it possible to accumulate enough condensation to turn my oil slightly milky after 7 months of sitting. I changed the oil 2 weeks before my distributor broke and it looked good. I had a hard time installing distributor but after realizing my timing marks were off I Finally got it figured out. I had installed it and tried to start Cple times a month but never started. Now it started and sounds, good, no miss, no smoke, not running hot but I pulled oil plug and it's milky. 

[richard wysong]

Probably not unless the crank case was open to the atmosphere. Was the distributor out of the engine for 7 months? i would change the oil and make sure the coolant is at the full mark and monitor the coolant level. It could be the intake manifold gaskets leaking

[Dee Hugh]

It was out for a few weeks but had a rag over it so nothing could fall in. Radiator is still on full mark. I drained the oil and refilled. Ran it for few mins and still clean. I plan to pick up filter today and drop the oil again and see what happens. Having none of the symptoms of a head gasket or a intake gasket is throwing me off. And the fact that it was fine and I didn't drive it all all then it's mixed up just from trying to start it so many times....faint smell of gas too

[Dee Hugh]

Well no signs other than milky oil

Edited February 4, 2025 by Dee Hugh

[Bleepster]

its still milky?  maybe run a flush, refill and new filter and as stated, keep checking

[dna9656]

If you're seeing the milky oil under the oil filler cap that is for sure condensate, it forms only due to not getting fully warmed up before it's shut off, like from short trips.You should change your oil every 3k miles or 4 months.

[Dee Hugh]

I drained the oil and changed filter. Filled it back up and ran it for Cple days. Not milky anymore and coolant levels haven't changed. I'll probably do one more oil and filter change this weekend, Must have been a lot of condensation. I'll keep a eye on it. Only code I have now is p1860 but runs fine