I hope member Kartgreen chimes in. He found a source of motor oil designed for classic engines.
I like
Shell Rotella straight 30wt diesel oil. No clutch slip
In a pinch:
Castrol Straight 30 wt oil and I blend in the zinc additive found at most auto parts stores.
I'm trying Castrol 30 wt with 10% straight 50 wt racing oil.
Both of the above oils give some clutch slip under heavy acceleration.
Since I live .5 miles from work, no lights or stop signs (except on the way back) I live with a little slippage until I find my Rotella again.
Never, but never, use Chevron straight 30 wt oil. I did and it glued my clutch plates tight.
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