Do you feel that you aren’t getting the power you should be from your rotary engine? Are you experiencing bearing wear under severe (or possibly under not-so-severe) operating conditions? If so, you may be using the wrong engine oil. Idemitsu 20W-50 can reduce or even eliminate some of the problems you may be having.
As the developer of the engine oil for the winning 1991 LeMans Mazda 787B and a long time supplier of vital lubricants to Mazda, Idemitsu has intimate knowledge of the requirements of rotary engines.