Hey, I recently bought an automatic 1991 325i off Craigslist and while I didn't see any when I was inspecting the car, the other day I noticed there was oil in the coolant reservoir.
However, there isn't any (visible) coolant in the oil, which is a good sign. Also, the car hasn't overheated at all since I've had it, stays around 1/4 the temp gauge
I did a compression test, and while the compression seemed on the low end, it was consistent across all cylinders. In the 105psi range, with the biggest difference being under 10psi. This was also with a closed throttle, cool engine, and not putting oil in the cylinders
I took out the coolant reservoir and cleaned it out as best I could, put fresh coolant in, and drove for around half an hour. Doesn't look like any more oil has gotten in the coolant either
Are there any other tests I can do to test the head gasket/if the head is cracked? Could it be something to do with the oil cooler?
Thanks for the help!
Tl; DR: Found oil in the coolant. No white smoke from the exhaust, it doesn't overheat, and no coolant in the oil. Compression was low, but consistent across all cylinders.
However, there isn't any (visible) coolant in the oil, which is a good sign. Also, the car hasn't overheated at all since I've had it, stays around 1/4 the temp gauge
I did a compression test, and while the compression seemed on the low end, it was consistent across all cylinders. In the 105psi range, with the biggest difference being under 10psi. This was also with a closed throttle, cool engine, and not putting oil in the cylinders
I took out the coolant reservoir and cleaned it out as best I could, put fresh coolant in, and drove for around half an hour. Doesn't look like any more oil has gotten in the coolant either
Are there any other tests I can do to test the head gasket/if the head is cracked? Could it be something to do with the oil cooler?
Thanks for the help!
Tl; DR: Found oil in the coolant. No white smoke from the exhaust, it doesn't overheat, and no coolant in the oil. Compression was low, but consistent across all cylinders.
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