Milky sump oil is coolant liquid in the oil. The leak may not necessarily be a head gasket but a corrosion hole behind the water pump impellor that is allowing water through the timing cover and into the sump. At this stage it will be a pin hole but it will get bigger.. Fix the problem as the water in the oil destroys the oil capabilities and will lead to engine failure.
SOURCE: 97 aurora overheats new stat flush system oil not
Was the engine overheating before you replaced the thermostat ?
By not putting the cap on tight, you are not allowing the cooling system to build up pressure. So it could be a restriction somewhere like a radiator hose.
SOURCE: I have a 2000 chevy venture with a blown head
sorry but that stuff only works for awile.just get the head gasket replaced.
SOURCE: oil is milky is this
I have done mechanic work with my father for years, everytime I have seen a vehicle with over heating issues and the oil is milky looking yes the head gasket has been bad. When replacing the head gasket always have the head checked for warps, or cracks.
SOURCE: I have oil in the water but it runs fine doesnt
I am afraid it is, or a blown water jacket either way the heads need to be pulled and checked make sure they are not warped. It's best to have the heads reworked it's safer, then you know your heads are OK if a good machine shop did the job.
SOURCE: My 2001 suburban is making
If you suspect gas dilution of the oil, DON'T try to burn it. If it does have gas in it the liquid won't burn but the vapor will FLASH and may burn you.
What you need to do is more tests. I would do a cooling system pressure test and a Used Oil analysis. There are kits you can get at your local parts stores to test for exhaust gases in the coolant (head gasket,crack). Use Google and search for "used Oil Analysis"..Blackstone labs is popular, cost is about $25.00
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