quote:
I think a lot of cars are starting to run 20 weight so they can meet or exceed CAFE standards, not really because it is the best thing to use for that particular motor.
This is true, but I find myself complaining about Mobil's tendency to thin out, yet based on the fact that 20wt. oils are becoming more popular, i don't think it really matters. You do loose HT/HS though.
This is from Mobil's website which has improved there Frequently Asked questions section. Mobil also mentions how there oils resist thickening due to oxidation. So thinng out doesn't seem to be an issue, as compared with thickening. I'm still stuck on this topic...
Won't a 5W-50 motor oil's higher viscosity (thickness) give better wear protection than Mobil 1 with SuperSyn™ 5W-30 or 10W-30?
SAE grades alone do not measure performance and protection. The basic issue is what SAE rating is best suited for a specific engine design. For instance, high-powered Corvettes are filled at the factory with Mobil 1 with SuperSyn™ 5W-30. All Porsches use Mobil 1 with SuperSyn™ 0W-40.
After you have selected the right SAE rating for your car (check your owner's manual), the difference between oil brands is found in the quality of their components. And in performance tests that we have run, Mobil 1 with SuperSyn™ 5W-30 provided excellent wear protection.
[ March 02, 2003, 12:02 PM: Message edited by: buster ]