On Sun, May 13, 2012 at 7:21 PM, John Meeks <vanagon@gmail.com> wrote:

 http://www.carbibles.com/engineoil_bible.html

John. Thanks for the link.

Reading now, I see this. (bold text is what I want to draw attention to
even though I originally posted regarding a synthetic blend):

*"If I put new, fully synthetic oil in my older engine, will the seals
leak?"*

"The short answer: generally speaking, *not any more.* The caveat is that
your engine must be in good working order and *not be leaking right now*."

*"Mixing Mineral and Synthetic oils - current thinking"*

".......There was a time, years ago, when switching between synthetic oils
and mineral oils was not recommended if you had used one product or the
other for a long period of time. People experienced problems with seals
leaking and high oil consumption but changes in additive chemistry *and
seal material* have taken care of those issues. And that's an important
caveat. New seal technology is great, but if you're still driving around in
a car from the 80's with its original seals, then this argument becomes a
bit of a moot point - your seals are still going to be subject to the old
leakage problems no matter what newfangled additives the oil companies are
putting in their products."

Obviously the author suggest that regardless of oil type or old or new seal
technology, if a seal already leaks, it leaks. But. I'd be curious about
the rate of leak changing when switching to a synthetic. Anyhow.....

Does the WBX use seals considered to be of "new seal technology"? e.g.
including push rod seals, any of the paper gaskets, etc.

If none of these seals/gaskets leak prior to switching to synthetic oil,
will these seals be ok?

Neil.

On Sun, May 13, 2012 at 12:49 PM, neil n <musomuso@gmail.com> wrote:

>> I don't know if the TBN and Low Ash aspects help a gas engine, but
> looking at "Oxidation Control & Shear Stability" here:
>
>
http://www.castrol.com/castrol/genericarticle.do?categoryId=82915547&contentId=7025207

....

> When introducing a synthetic blend oil to a an engine that's been
> running NON synthetic, is there a high risk that the new oil will
> cause seals to leak?

--
Neil n

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