41mpg...

[daf62757]

Originally Posted by SilverGlow

I agree synthetic will often provide 1% to 2% better MPG. However, you are dead wrong about the "much better protection" over using mineral oil (dino). Too many Used Oil Analysis tests prove you wrong. The wear number differences are way too small, too insignificant. Now the one great thing about synthetic is that using them can allow you to safely extend your oil change intervals over dino. For example you could go 7,000 - 10,000 and beyond with certain synthetics. I would not go more then 5,000 with dino, however.

I don't know. Common sense is that an oil that reduces operating temperature like synthetic oil will extend engine life. Extended life is a direct by product of better protection.

[1stToyota]

Originally Posted by daf62757

I don't know. Common sense is that an oil that reduces operating temperature like synthetic oil will extend engine life. Extended life is a direct by product of better protection.

Yeah, SilverGlow needs to find a dino oil that flows at -54 degrees f (Castrol GTX is -31 degrees)
And passing around 10K mile OCI advice is dumb unless it's followed with a footnote about the car already being out of warranty.
IMO, don't listen to any oil advice given out by SilverGlow, ever...he's still using and advising others to use 0W-20 oil in the Yaris eventho' the TSB that Toyota issued couldn't be more clear about not using 0W-20 in the Yaris NZ 1.5