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2 questions

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1. The B&S books say you can use SAE 10W, 10W-30, and 10W-40 down to 0 degrees F. I was wondering what temp SAE 15W-40 can safely used down to with out and engine start up damage. 2. Anybody know why the the aluminum cyl. Briggs engines idle at 1750 RPM and the cast iron and cast iron sleeved engines idle at 1200 RPM?

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15w40 oil is mainly a heavier oil used in diesel engines. and 10w40 is a terrible oil. In my diesel mechanic schools yrs ago they said in order to get the viscosity swing from 10 weight up to 40 weight the oil has to be more additives than lubricants. for our tractor gasoline engines I use 10w30 in winter and SAE30 in summer in the mid-west. Canada or Alaska maybe 5w20 or SAE10??? sm01

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Off topic but I have been using 5/40 full synthetic shell rotella in my Mazdaspeed3 2.3L turbo for 91,000 miles now and very pleased. The engine on a mustang dino is putting down 305hp and 315 torque to the wheels and still holding together.

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