> If it's in the Tecumseh manual, isn't that the final word on the
topic?
Absolutely not. No more so then warnings about no customer serviceable
parts inside. Yet many of us take apart and repair our microwave ovens
and such quite successfully. In spite of warnings from the manual that
it cannot be done.
> The fact is, the designers of the engine know the engine INSIDE
OUT,
>they've seen hundreds, they know every failure mode, every wear point,
>every cost cutting measure, every design improvement that makes your
>version better than the one before, and everything that the next
version
>has that yours doesn't.
Which is why no product recall has ever existed. The designers know
their product completely, and have resolved all issues with it, and
there will never be any problem of any type with any product ever made.
Isn't that absurd? Of course it is. The design engineers do *not*
have an absolute knowledge. Never have, never will. Having worked as a
mechanical engineer in a power tool research lab, I can say that with
quite a bit of confidence.
> When you design a product, you know it to a level that frankly a
lot
>of people don't comprehend...
You would be appalled at how little many of those design engineers know
about their product.
> The designers know what makes the engine run best. This information
>goes into the manual.
Wrong. Engineers do not write that manual. The manual is written by
marketing, blessed by the lawyers, and sent out.
Fwiw, the single weight oil recommendation does in fact have to do with
thermal breakdown resulting from the high heats of an air cooled engine.
Synthetics, have an even higher temperature range then conventional
single weight oils. As such, a multi-weight synthetic exceeds the
manufacturers recommendations.
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