Quote:
Originally Posted by wmjinman
Wow, really? You got better mileage with 10w30 than with 5w20?!?!?! That sure is counter-intuitive, huh? Were these the same brand & type oil? (synthetic, etc) And was that better mileage consistant throughout that whole time with the heavier oil? Definitely some "food for thought"!!!
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Look at my fuel log for 'Sweetie' and it's easy to find where I ran the 10w30.
Better mpg throughout the service interval, better record mileage (+2.5 mpg),
Same brand (Pennzoil) but Pennzoil Ultra 5w20 (syn) vs PYB 10w30 (conv).
Funny thing was that the engine 'felt' a little sluggish with the 10w30 so I figured the mileage would suffer.
I've run Durablend 5w20, M1 5w20 and 10w30 (terrible), RP 5w20, PU 5w20 and PYB 10w30. Going back to PYB but might try the 5w20 just to see.
Starting to feel like all the supposed advantages of much touted synthetic oil is a farce! BITOG is a wonderful site for learning about oil.