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Alright, I'll probably go with M1, @$9/Qt. I'm going back and forth with a local AMSOIL dealer and see what he do for me, but it's looking like 60% more expensive than M1. For the sake of arguement though, AMSOIL Synthetic Long Life 75W-90, or AMSOIL Sythetic 80W-90: is there a big difference...

I've got an '03 Trailblazer EXT 4WD 4.2L with 141k miles. Just bought in December at 136k miles and have no idea what the history is on differential or transfer case fluids. With the transfer case, it doesn't appear I have much of an option, gotta go with dealer supplied AutoTracII. I was...

Not exactly an expert here, but from other threads I see smart fella's recommending synthetic for short drive, cold weather situations (for your Nov-Apr oil). Definitely dino oil is good enough for the summer though, especially at that interval.

Originally Posted By: Char Baby Typicaly, Syn oils have better flow for cold starting but, it also depends on how cold out it is! At certain cold outside temps, oh let's say at zero deg F, they may both be the same, i.e. syn 5W30 vs. dino 5W30. But when it gets really cold outside,(-20 or -30...

How are the following Valvoline deals currently on Advance Auto? If you definitely think I should go synthetic I will, but I like to save a couple bucks when I can. They include 5 quarts and Puralator PureOne filter. I realize I'd have to pick up an additional 2 qts. Valvoline... Conventional...

New here, wondering what the experts have to say about oil type, filters and change intervals. 1. What kind of vehicle you have 2003 Chevy Trailblazer EXT 4x4 with 4.2L engine, 137k miles just bought it last month and have put about 1k miles on it so far. 2. What your owner's manual says --...