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I'm using 0w40 mobil one euro spec. The car makes more noise at cold starts, and seems to take a bit longer to bring the oil temps up. However, the oil and water temps stay right around 192 F during normal driving. For spirited driving oil temps are between 220-240 F, but come back down a lot quicker when cruising.
20w50 seems really thick, so unless you live in an area with a really warm climate or humidity, you probably don't want to run something that thick unless the motor is running a turbo or supercharger.
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