Lots of threads on this topic and lots of conflicting information. Which of these two theories is correct? Both have been posted and/or confirmed by knowledgeable members in one way or another. But contradiction creates doubts, and I would greatly appreciate if anyone could shed some light on this. Preferably through facts and not guesses/speculation... Thank you in advance.
Theory 1: In short tripped vehicles, with low rpm cruising and/or rare use, it is best to use the oil of lowest viscosity available. It will flow faster and be the quickest to get up to temp, but it's final operating temps will be lower. Many argue that lower film thickness is a problem, but easier flow and pump-ability balance that off.
Theory 2: In short tripped vehicles, with low rpm cruising and/or rare use, it is best to use oil of a higher viscosity as it will heat up faster through frictional drag, and final operating temps will be higher, aiding in moisture burn-off. Here many argue that it provides higher fluid film thickness, at the cost of cold start-up protection, but gives better overall protection, and aids with fuel dilution that short tripped vehicles are known for. (talk about run-on sentences)
So which one is it? Or maybe both? Is mid-grade (like 5w30) the ideal place to be for any internal combustion engine? Discuss...
Theory 1: In short tripped vehicles, with low rpm cruising and/or rare use, it is best to use the oil of lowest viscosity available. It will flow faster and be the quickest to get up to temp, but it's final operating temps will be lower. Many argue that lower film thickness is a problem, but easier flow and pump-ability balance that off.
Theory 2: In short tripped vehicles, with low rpm cruising and/or rare use, it is best to use oil of a higher viscosity as it will heat up faster through frictional drag, and final operating temps will be higher, aiding in moisture burn-off. Here many argue that it provides higher fluid film thickness, at the cost of cold start-up protection, but gives better overall protection, and aids with fuel dilution that short tripped vehicles are known for. (talk about run-on sentences)
So which one is it? Or maybe both? Is mid-grade (like 5w30) the ideal place to be for any internal combustion engine? Discuss...
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