[TR] Changing oil to full synthetic

[Greg Perry]

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.

Regards,
Greg Perry