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A week ago I purchased my first brand new vehicle. I am 19 years old, but have been just as obsessive over the maintenance of every vehicle of mine as any other BITOG member. I am quite adequate with a wrench and have personally performed all the maintenance and repairs my driveway will allow...

My oil pressure has been reading noticeably lower lately, with about 2500 miles on my Syntec 10w40. I assume this is because of shearing? I'm running this weight of oil because it provides more comforting oil pressure in the first place. This is on an engine with 255,000 miles... Is Syntec...

Are gear oil weights about like motor oil weights in that a slight variation from spec will do no mechanical harm? For example, my truck calls for 80w90 in the rear end, would it be fine to use 75w90? Going further, is this oil thinner when cold and therefore beneficial for fuel mileage? Like...