I am asking for troubleshooting advice for a R32 GTR. Yes I have searched but did not find an answer, just similiar issues without a resolution.
To the problem....
At the moment I am having issues with oil entering the coolant system. I first noticed it with a slight build up of brown greasy crap under the radiator cap. Since then I have flushed the coolant system, replaced the radiator, thermostat and am still getting build up of the brown greasy stuff in the radiator and coolant overflow bottle. It is definitely engine oil as it slowly being used, but did not seem to be affecting engine oil pressure.
I have run a TK Test for exhaust gases in the radiator (which there was none), completed a cold dry compression test with 5 cylinders coming up at 150 with cylinder 1 coming up with 132. I have also dropped the oil and it is not milky brown so it does not look like coolant is entering the sump. The spark plugs look fine with no obvious signs of contamination.
I am thinking along the lines of a blown headgasket (due to a low cylinder comp) between oil gallery and coolant galleries, however before jumping in and disassembling the engine I thought I would ask around as to what other things it could be or what other tests to run so that I can identify it as being a headgasket (or worse.. Cracked head).
The only other thing I can think of is potentially a problem with the water/oil seals on the engine warmer on the side of the block (where the oil filter mounts)....
Any opinions or help would be really appreciated as it has me stumped as to why I am not seeing any typical milky brown oil in the sump/head etc while oil is getting squeezed into the cooling system.
Thanks in advance.