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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...

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 --...