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      06-05-2012, 12:31 PM   #1

Drives: BMW
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Question Plastic vs. aluminum thermostat

So... my thermostat failed (got "Service Engine Soon" light), so I took it to a shop for repair.

After I got the car back, engine oil temp is up to 230 F to 240 F... it used to be almost always 220 F.

Apparently the difference is because they put in a plastic thermostat to replace the aluminum one that they removed. They're saying the plastic was OEM, but the aluminum one they removed came with the car, so obviously that is OEM too.

I always figure that running a lower temp consistently will be better for the engine -- after adding the oil cooler, temps have been solidly 220 F (unless pushing very hard), whereas before the oil cooler the temps were like 240F consistently.

Any advice would be great!

Appreciate 0


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