Question about 1988 Mazda B2200

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What causes oil to get in antifreeze

My 87madza b2000 started overheating i check the thermostat there was oil deposit on it i put in a new one truck run fine for a week then started overheating again i realized there was light oil in antifreeze check the thermostat again there was more oil deposit so i took the thermostat off and drove without thermostat run fine. Questions: Will driving without Thermostat cause damage to truck? Why is oil getting into antifreeze?

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Driving the truck without a thermostat won't necessarily hurt the engine. It will take longer to get heat and it will be sporadic because the coolant is always circulating. Oil in antifreeze could come from 2 places, transmission cooler in rad if you have an automatic. The lines inside will occasionally start leaking. The other is from the engine, usually a head gasket leaking. My suspicion is that you have a leaking head gasket. This would explain the over heating with oil in the coolant. Take it in and get a pressure test on the rad or a compression test on the engine. This should confirm or eliminate the head gasket. Hope this helps.

Posted on Jan 31, 2010

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