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When I got my 1997 965, it had synthetic in it, so I continued that. Then I considered using it in my high-mileage 1988 244GL.
The usual caveat is that this change can cause oil leaks. How? Mineral oil can leave a varnish residue in locations that - over time - could be leaks without that residue. Synthetic washes away that residue, allowing leaks to become leaky.
When I switched the 244 to Mobil-1, no leaks showed up. BENEFIT - never having to clean a flame trap. It was always clean, so after several oil changes I quit looking.
So now all my drivers are on synthetic, using Mann filters and 5000 mile interval.
Good Luck,
Bob
:>)
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