Antifreeze contains glycol. Glycol breaks down at high temperatures
and when it cools back down it forms clumps.
Antifreeze in your motor oil creates a lot of sludge very quickly.
When sludge builds up, the oil strainer gets clogged. The clogged
strainer prevents oil from getting to the motor (oil starvation). You
know that oil acts as a lubricant to the metal parts of your engine.
When there isn't enough oil, youll get metal-to-metal contact.
The friction this produces wears down the metal parts. If it gets bad
enough - and hot enough - the moving part will get fused together -the
engine will seize. Once it seizes, youll have to rebuild or replace
If you think you have antifreeze in your oil, get the oil changed.
Don't wait to see if you'll have a problem. By the time you find out,
you'll be paying a BMV mechanic a lot of money to put a new engine in
your very nice car.
Some sites that explain this are:
"As engine temperature rises, so does the probability that the
glycol/oil mixture will approach solidification."
"Example: during a routine valve cover gasket replacement, antifreeze
could accidentally run or drip into the oil, creating large amounts of
sludge very rapidly."
"Glycol, as found in engine coolant, when mixed with motor oil
(including synthetics) will greatly increase the chances of engine
"Coolant Contamination -- Cooling system leakage is one of the most
serious hazards for engine lubrication. One alternative test measures
the level of glycol in the oil, while emission spectroscopy will
detect levels of boron or sodium from the additives in antifreeze. In
either case, once coolant leakage is detected, the leak should be
repaired and the oil changed."
"Antifreeze is an insidious bearing destroyer. When the oil is hot,
the antifreeze mixes congenially causing no appreciable problems. When
the oil is cold, the antifreeze will coagulate into clumps. If this
coagulation happens inside a bearing, say bye bye."
Notice that these sites cover car, boat and motorcycle engines...
search terms: antifreeze motor oil engine sludge
Get your oil changed... fast!
Good luck and happy searching,