Re: Straight 40 to thick?
Greetings TJ!
Take it from an old farm boy, straight 40 is way too thick for winter. You are far better off using the 15w40 oil for winter weather. 10w30 Amzoil Synthetic Oil would be even a better choice over the 15w40. Straight 40 is fine for summer, but running straight 40 in winter, you might as well have molasses in your engine because straight 40 flows just about the same. If you are lucky enough to get the engine started on a zero or below zero day (most engines will fail to start in temps that cold even running a straight 30 oil,) you run the risk of engine damage since you will have a lot of parts starving for lubrication until your molasses thick oil gets to them.
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