I've been using Castrol 20-50 in my 20B, with the metering pump injection.
The exhaust goes through the prop.  Based on the gummy/sticky film that
builds up on the prop; it seems to me that the oil must not be burning very
well.  I'm thinking I either need to change type of oil, or dis the OMP and
go to premix.

Since the Idemitsu racing oils are made especially for rotaries; do you
suppose that clean burning is also one of their qualities?

Al

I think so. I have been using it in my RX8. Besides that, the girls
they hire in Japan are cute :)