10W-40 in disfavor

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1 total messages Started by Mark Stevans Sat, 16 Nov 1985 19:13

#110

Author: Mark Stevans
Date: Sat, 16 Nov 1985 19:13

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According to my 1984 Toyota owner's manual, 10W-40 should be used for ambient
temperatures above 40 Farenheit.  However, my Toyota dealer says that 10W-40
has fallen out of favor with manufacturers.  It seems that various polymers
are mixed into 10W oil to "stretch" it to a 10W-40 multigrade are not quite
stable enough, and break down too quickly in high temperatures.  10W-30 is
about at the safe "stretch" limit, and so it is recommended instead.

This seems to make sense to me, but might not a less polymerized oil, such
as 15W-40, be better than the lighter oil, at least in the summer?

					Mark Stevans
					ritcv!husky!mls

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