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Bought a 55G drum of AMSOIL 15W40 Heavy Duty Diesel and Marine oil in 2008. Used about half but then sold my diesel. Oil has been in my basement which is pretty constant temperature and humidity since then. A friend wants to buy it, but is concerned that it may not be any good. I have no clue...

Since DI diesels need clean fuel, and the new Ford Ecoboost DI engine may also need refined fuel, would it be feasible to use a diesel fuel filter in a gas engine to replace the OEM fuel filter? Would the media melt, dissolve?

Bought a 55 G drum of the synthetic oil in 2008. It is laying on its side on a stand, and I take 5 qts out every 3-4 months. I have a valve installed and crack open the top to vent it and drain out what I need. After searching the shelf life issue, I am starting to worry that maybe I should be...

Rode my 09 Harley Ultraclassic in 95 degree stop/go traffic. Engine started pinging real bad. May have been bad gas or maybe engine just got too hot. Using AMSOIL 20W-50 Motorcycle oil in engine with about 1500 miles on the oil and 8500 miles on the engine. Should I change the oil after the...

Just bought an 06 Deuce with 153 miles on it, but one year old. So thought I should change the oil. AMSOIL 20-50 or Mobil 1 20-50 is the first issue. The book says to use diesel oil with API rating of CF-4, CG-4, CH-4 or CI-4, but the AMSOIL and Mobil 1 don't meet that spec. Amsoil has SG...