Quote:
Originally Posted by Gav
Unless you are planning to drive your car in sub zero temps your oil won't get cold enough in the cooler to cause issues.
Here in Oz we don't get the extremes that they do elsewhere.
A cobra looks a bit funny IMHO without an oil cooler up front though! |
Not true. Doesn't need to be sub-zero to create a problem. It's common for me to leave the house in the morning with temps in the 40's. On a highway cruise, there's a lot of air flow and not many rpm's. Even with the thermostat "closed", the
oil would not get to operating temp. Tried covering with duct tape, plastic, and cardboard. Those things helped, but the oil never really got up to temp.
Quote:
Originally Posted by AL427SBF
Is this correct? I think they mean prevents the system from being "shocked" by a sudden flow of cold oil in the engine.
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Both, actually.
If the oil is cold, and you get on the throttle a bit, the oil pressure rapidly rises with rpm's. If the oil is too cold and too thick (a lot of people use 20W-50 oil), you can actually burst the oil cooler from the pressure spike.
If the oil in the cooler and lines are cold and the thermostat suddenly opens on a warm engine, then a thick and cold slug of oil will hit the bearings, rotating assembly, and valve train. If you're at speed, bad things will happen.
Using something like a 5W-30 or 0W-30 oil will help prevent all those problems.