BigBeans
10+ Year Contributor
- 1,423
- 27
- Aug 16, 2009
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I am in,
Rhode_Island
10w40 is better for higher mileage cars
Heavy oil protects better after the initial startup. In cold winter temps you want thin oil for good lube on startup. This is the first number (10W30).
In the summer i want an oil that's a little thicker when up to temp because of the warmer air temps, and the fact that the car sees more full throttle time, track and otherwise, during the summer months.
I've thought about going to a 20w50 for the summer, but i don't think it's necessary because i'm not doing any road course stuff with this car.