Thats water mixed with oil. Sometimes its just condensation if the car
is not driven very often, although not if its oil in the coolant water.
Usually you will get water in the oil pan as the water side is
presurised, but its not unknown to get oil into the cooling sytem.
This could be a leaking gasket or a small crack somewhere. If its not
getting water into the oil pan, it will run for a while. However too
much oil in the water will make it more like glue than water and will
clog the radiator if it gets bad enough.
Smoke out of the exhaust at higher revs, usually indicated worn cylinder
bores, and or rings, its where the rings are losing contact with the
cylinder walls and letting some oil into the combustion chamber.
Pistons have 2 compression rings and 1 (3 piece) oil ring, these work in
different ways. The compression rings ( solid top ones) stop gases
leaking past them into the oil pan. These seal best on compression stroke.
Take the oil cap off an older engine and put your hand over it, and
you will usually feel some pressure.
Oil rings consist of 2 very thin rails with a wavey spacer, this scrapes
the oil off the cylinder walls and prevents it from getting up to the
compresion rings. The oil drains back through the wavey part of the ring
They leave a little oil on the walls to keep everything lubed up, but
not a lot.
Oil is splashing about everywhere inside an engine while it is running,
keeping everything slippery and carrying away heat. some con rods have
little holes in them that will spray oil onto the cylinder walls. There
is also a lot of oil going therough the bearings, that just leaks out
the sides. If the con rod bearings or con rod journals of an engine wear
into an oval shape, this actually pumps oil through the bearings.
This lets too much oil get onto the cylinder walls, and the oil rings
just can not keep up.
Short answer the more you lean on an engine the shorter lifespan they have.
David Lane wrote:
Head gasket 300TE.
In the left front of the row 6 cyl. block there are two openings, one for
oil and one for coolage.
If the the head gasket leakes in that spot you may get coolant mixed into
the oil, giving the result you describe.
This is a well known problem to the W124 and when it happens you have to
change the gasket.
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