I worked for a company the shop foreman would only use 15-40 in all engines. The company bought 5 new 2007 Chevys with 6.0 engines they did all the oil changes at 3000 miles and all 5 of the trucks within 100000 miles either had to have new engines or oil pumps. The head tech found out from GM that the oil pump was positioned different on these newer engines and the heaver oil would not pick up correctly on cold start up and thus starved for a few seconds every start. After a few more costly moves like this the foreman was fired and they use the correct oil on all there newer trucks with no issues. John
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Today's Featured Article - Farmall 460: That's My Girl - by LeAnn R. Ralph. How many sounds can you think of that are as familiar to you as your own breathing? What about the hum of your refrigerator? Or the thump of your clothes dryer? Maybe the engine of your car? You hear those sounds every day, and you don't think much about them, do you. I can think of a few common, ordinary sounds in my daily life, too.
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