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My 96 Jeep Cherokee 4.0L is getting crap for gas mileage lately. The temps have been in the teens for a while. I know in the winter time they run a different gas around here. The motor runs fine and has plenty of power, but I did notice last week that while I was loading some wood up at Lowe's...

It's around 10 degrees today and I can tell my Jeep 4.0 I6 engine is struggling a little at start up with the M1 10w-30. I stopped at Autozone and couldn't find any GC 0W-30, which seems to be the latest rave on this site. They did have 0W-30 in the M1 flavor, so I got it. What are your thoughts...

Are heavier oils better for protection??? I have a liquid cooled Honda CBR 954cc sportbike and am wondering if it's beneficial to run a 20w50 (better protection)? Then I start to think about the tolerances. Maybe a heavier oil isn't so good to use, and maybe it's robbing me of some performance...

The time has come to pull the drain plug on my Jeeps AW4 tranny pan and replace the fluid. Is Napa's stuff okay? Or, is there something better at a comparable price?

Who makes NAPA's brand of motoroils and transfluid?

I have an '02 CBR 954 that's inline 4 , water cooled. So far I have run in it: Honda GN4, M1 15-50, and M1 Vtwin 20W-50. I recently ran the 20W-50 because of a recommendation by a person on a bike site that tests oils. He was always concerned about running long OCI because of fuel dilution. What...