No. But the thermostat has ABSOLUTELY NO EFFECT on the upper operating
temp of an engine. It only controls the MINIMUM operating temperature,
which you would know if you had half a clue about automobile
And today's oil, in some important ways, is INFERIOR to oil of as
little as 5 years ago. Due to concerns about catalytic converter
poisoning, the zinc and phosphorous based extreme pressure additives
have been all but eliminated fron current automotive spec oils.
Nothing has been found that is as effective as an extreme pressure
additive as the old zinc/phospourous combination.
And the Chryco, Toyota, and Honda techs I speak to say the much
discussed "coking" problems do NOT EXIST on engines where the oil is
changed on the "extreme service" schedule. Period.
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