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2000 Toyota Tundra 4.7 V-8 148k miles Out-Mobil 1 Synthetic 5w30 In-Valvoline Full Synthetic 5w30 and Napa Gold filter

I am currently running Mobil 1 HM 5w30 and just changed it a couple weeks ago. I didn't figure there would be much of a mpg increase but any little bit would be good. I won't likely change the oil again until late spring comes around and I thought 5w30 may be better in the warm months of the...

I have a 2000 Toyota Avalon with 140k miles that calls for 5w-30 oil and am considering running ow-30 at the next oil change in hopes of a slight mpg increase. Is there any advantages or disadvantages to switching? I have been reading a few of these oil threads and the knowledge you guys have of...