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Hey Mark A Nemetz,

The reason you see all the new vehicles recomending 5-20 or lower is for the company to meet mileage spec's. I have 2 vehicles 99 and 02 along with a 00 Lowrider. I use 10-40 in the car and truck, just because I like it and it works fine, also it keeps the inside on my engine clean, so I go by the rule don't change it it's working good. On the HD I use hd oil 20-50 but change it every 1k. My rule of thum. I guess I change my oil enough and it's not dirty enought I might just start using it in my truck. Well it just a truck.
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