Kirk,
The issue with synthetic in a gearbox is that it tends to be too
slippery for proper operation of the synchros, leading to lots of
gear-crunching shifts. I lean towards 20W50 myself.
David L
On Sun, Mar 21, 2010 at 4:23 PM, Kirk Hargreaves <khargreaves2@gmail.com>
wrote:
> Thanks to all of gave advice on what to run and how much to put in.
>
> Seems that there might be a bit of a difference going on regarding running
> motor oil, non-detergent oil. . etc.
>
> I am using motor oil (non-synthetic).
>
> However. . I am not totally convinced that synthetic would harm the gear
> box.
>
> Back in the day when synthetics came on the market there was a lot of talk
> about how they would spin bearings and cause other issues.
>
> A synthetic is the same thing as a non-synthetic. . only that it's
> molecular chain has been equaled out to ten chain molecular links as
opposed
> to a non-synthetic which can carries different molecular chain lengths. A
> non synthetic chain might have 7 or 3 or whatever is found. And of course
> there can be different additives in the differing products as well.
>
> The ten chain process allows the oil to sustain greater amounts of heat.
> Same idea as what it takes to light a phone book or a pile of leaves. It
> also makes it more of a lubricant. . more of a slip factor between metal
> surfaces.
>
> Harley Davidson was the biggest hypocrite saying that their bikes must have
> the Harley 360 non synthetic product or damage would occur to their
engines.
>
>
> Dealers were also adamant about this. (And of course the dealers were
> carrying 360 on their shelves).
>
> The motor company realized that Harley owners were using Red Line and other
> brands of synthetic in their bikes, and that the bikes were running fine,
no
> issues. Owners were racking up miles on their bikes with no issues.
(Which
> to me says more about frequency of oil changes than whether the oil is
> synthetic or not).
>
> I believe that Porsche made it mandatory that the owner uses a synthetic,
as
> well as Ferrari and other high end automobile manufacturers?
>
> Short story. . Harley finally came out with their own brand of synthetic.
> Their response, "We realize that Harley owners are running different brands
> of synthetic oils in their bikes, so we came out with our own
> in order to control the type of synthetic oil that our owners should use."
>
> What a crock of )(*7u980. . . Harley's determination was a result of the
> free market place and bike owners doing what they thought was best for
their
> high dollar investments.
>
> Eventually, much of this talk about spinning bearings and causing harm to
> different metals and how the parts function seems to have dissipated.
>
> I am playing it safe as so many listers have talked about not using
> synthetic in a rib case. Again, maintenance rules over all. However I
> wonder what, if any real harm would come running synthetic in the box. and
> if their just might be some value to the idea of doing so?
>
> My ramble on the subject!
>
>
> Kirk
> 59
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