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Everything I've read says that synthetic oil is fine at even 300°F. Why is there such a push to put oil coolers on these cars? You want the oil hot (>212°F) so it burns off the water from combustion byproducts. Unless you're changing it really often. Why not just skip the pressure lose of a cooler and run an appropriate oil for the temperatures. M1 0W-40 to get the best viscosity index I know of would be my thought process as it should maintain its viscosity well as temperatures increase and still act like 0W-20 at startup. If your oil temps are going higher than 300°F or if you're pressure is going too low - and the oil cooler will actually increase post cooler pressure - then get one. Otherwise, why add the complication?
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