I?ve been running Castrol 20-50 in my 20B to this point (about 25 hours).  Now that it is about ?broken in?, I?m considering changing to synthetic.
Everyone has their favorite oil, but I?m thinking the Idemitsu racing oil;
?specifically engineered to meet the unique requirements of a rotary
engine?. http://www.idemitsu-usa.com/page_211.htm, would make sense.

It comes in 10-30 and 20-50.  Considering typical operation at high power,about 5000 rpm, and at temps of 180 -210; I?m thinking stay with 20-50.

I use the stock oil metering pump for pan oil to the seals.

Comments?

Al

That is what I use in my RX8. Mazda recommends 5 W 30 as I recall.
the lighter the weight the less friction and it cools better.
Mazdatrix stocks it.

Paul Lamar ...No rotor no motor.

My 2005 RX8 Shinka's manual says 5-20.

Scott Gettings

My mistake. Yes  5 W 20.

Paul Lamar ...No rotor no motor.

The reason for the light weight oils isnt so much cooling as it is gas
mileage. And it's not as big of a deal in a rotary as it is the piston
engines. I personally can not fathom running a 5 weight oil in any engine,
so I don't. I'll give up a little gas mileage.

Bob Mears
Supermarine spitfire

Idemitsu has heavier weight rotary engine oil if you wish to run it.

Paul Lamar

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