if the oil fails to reach and maintain a minimum temp of 215F for at least 15 minutes theres frequently enough moisture left in any engine to form that mix of oil and moisture, its usually found in valve covers, and your timing cover because, being thin sheet metal in most cases, they cool a bit faster than the lower larger heavy cast components in the engine , a working PVC and breather assembly or a CATCH CAN can generally REDUCE but not totally remove the problem. the moisture posses a problem in that it can form acids with exhaust bye-products that can destroy bearings over time if the engines left un- attended in a moist area.
obviously, if you have coolant getting mixed with the oil theres a coolant leak into the engine, you could be dealing with a blown head gasket, leaking intake gasket, cracked cylinder head, cracked block, loose valve guide or other issues so you need to tear it down and locate the source of the coolant getting into your oil before it does major damage, which it will rather quickly
Obviously if your driving the car regularly and allowing it to get up to operating temperature , and you still have moisture in the oil ,moisture indicated on the oil dip stick, or if the oil smells like antifreeze , or coolant in the oil filter, its a BIG PROBLEM, and you better start checking for gasket leaks, cracked heads etc. so a coolant system pressure test and a cylinder leak down test is going to be a good idea.
coolant mixed with oil has almost no ability to lubricate or prevent rust, a leaking head gasket,a cracked head, or leaking intake gasket, etc. will allow the two fluids to mix, if the problems not quickly corrected, the engine run with the mix being pumped to the bearings is in for major damage too occur
read these related links
viewtopic.php?f=54&t=3057&p=8072#p8072
viewtopic.php?f=54&t=2207&p=12639&hilit=vacuum+valve#p12639
/viewtopic.php?f=52&t=2005&p=5328&hilit=+valve+vacuum+PVC#p5328
/viewtopic.php?f=54&t=2102
/viewtopic.php?f=54&t=615
viewtopic.php?f=54&t=3834&p=10199&hilit=cutter+filter#p10199
viewtopic.php?f=54&t=4611&p=12336&hilit=filter+inspect#p12336
viewtopic.php?f=57&t=74&hilit=slime
/viewtopic.php?f=54&t=296
obviously, if you have coolant getting mixed with the oil theres a coolant leak into the engine, you could be dealing with a blown head gasket, leaking intake gasket, cracked cylinder head, cracked block, loose valve guide or other issues so you need to tear it down and locate the source of the coolant getting into your oil before it does major damage, which it will rather quickly
Obviously if your driving the car regularly and allowing it to get up to operating temperature , and you still have moisture in the oil ,moisture indicated on the oil dip stick, or if the oil smells like antifreeze , or coolant in the oil filter, its a BIG PROBLEM, and you better start checking for gasket leaks, cracked heads etc. so a coolant system pressure test and a cylinder leak down test is going to be a good idea.
coolant mixed with oil has almost no ability to lubricate or prevent rust, a leaking head gasket,a cracked head, or leaking intake gasket, etc. will allow the two fluids to mix, if the problems not quickly corrected, the engine run with the mix being pumped to the bearings is in for major damage too occur
read these related links
viewtopic.php?f=54&t=3057&p=8072#p8072
viewtopic.php?f=54&t=2207&p=12639&hilit=vacuum+valve#p12639
/viewtopic.php?f=52&t=2005&p=5328&hilit=+valve+vacuum+PVC#p5328
/viewtopic.php?f=54&t=2102
/viewtopic.php?f=54&t=615
viewtopic.php?f=54&t=3834&p=10199&hilit=cutter+filter#p10199
viewtopic.php?f=54&t=4611&p=12336&hilit=filter+inspect#p12336
viewtopic.php?f=57&t=74&hilit=slime
/viewtopic.php?f=54&t=296