The differences between mult-weight and straight weight oil eludes me. If it is always 95 degrees, what is the difference in viscosity and protection between 20-50W and straight 50W? Does not the use of mult-weight simply mean a thinner oil in cooler temps, and the thicker rating when it is hotter? I was taught that the 10-40W will be basically 10W in colder weather (temp dependent) to make starting no problem and still be as protective as straight 40W when it is hot. I am ignorant of why straight weight even exists anymore. (and on a lot of other topics as well) I run 20-50W year round here in SLC, and have never had any trouble starting in the winter. It ain't Alaska, but it does get darn cold <g> Thanks for the lessons, John |
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