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I read up on oil years ago and my general take away was that the upper number for when the engine was hot should be at least 30 if not 40 and the cold number was always too high so go as low as possible, certainly use 0 instead of 5 or 10. In general it may not make a huge difference but until...

I browsed through some reading on this site a few years ago and got the impression that generally you can't, at least without special ordering, you can't go to low on the first number and 40 is better than 30 for the high number. So in general even if my engine recommends something else, for a...