Originally Posted By: kd5byb
I've got a 2007 Tundra 5.7L Crewcab. I've used Amsoil 0W-20 and it turned in very, very good UOA's. In fact, those may be my UOA's referred to earlier in the thread.
Lately I've fed it Valvoline Synpower 5W-20 (O'reilly rebate) and was mostly happy. Only thing was that towards the end of the last OCI, fuel mileage went into the toilet. From high 19's to low 17's. I then changed the oil for Quaker State Q-horsepower 5W-20 (with rebate). I also did a drain and fill on the tranny with Toyota WS. Gas mileage is back into the high 19's. I find it hard to believe that an oil change would boost fuel mileage so much, but I can't explain it any other way.
All oils seemed to sound the same in it - can't tell if one is quieter or not.
I'm a believer in the drain and fill for the tranny. The fluid I drained at 40k didn't look bad, but it sure wasn't new either.
thanks,
ben
Your mileage went in the toilet with the valvoline?
Good decision on the trans drain and fill; what did you pay for the WS?
Did my tundra couple months ago with ATL, and so far it's improved low throttle shifting some. You're right, the old didn't look bad, (even mostly towing) but it's a good thing to start the process off sooner. The old fluid in my truck looked maroon in color, while the new was a bright red. Truck at 27k now.
IF you did the d&f yourself, did you check the level before you drained to see if toyota underfilled you?
What's your plans for future drains?
Later