Well, it's almost always been my experiences with synthetics that they leak
more. A damp spot becomes wet, and a slow drip becomes an active leak.
Others insist that isn't true, but it's certainly what I've observed with
synthetics.
The concern over flat lifters vs roller lifters was originally a break in
issue. It has since morphed to a hysteria that all flat tappets will
promptly self destruct with new oil. As that hasn't happened, and many new
engines are still flat tappet design, I rather suspect the story has become
quite overblown.
----- Original Message -----
From: "Greg Perry" <rgperry@earthlink.net>
To: <triumphs@autox.team.net>
Sent: Tuesday, October 02, 2007 12:16 PM
Subject: [TR] Changing oil to full synthetic
> Hello List,
>
> What has been the experience if any with changing from mineral based oils
> (Castrol GTX 20-w50)to full synthetic based oils Castrol Syntec 20W-50)on
> a flat tappet 200,000 mile leaky Triumph motor? The question comes about
> because of the recommendation from Castrol oil Company of only using
> Syntec 20W-50 only in flat tappet camshaft engines.
>
> I would suspect that the synthetic oil would leak more vigorously than
> mineral oil. I'm hesitant to change to full synthetic oil. I tried
> Mobile 1 when it first came out. It was too thin, valve train clattered
> loudly until oil got there and leaked out of the ford 460 at the time.
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