rotaries and the right oil

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1,723
Location
Virginia
What does the manual state? I seem to remember Honda saying NOT to use synthetic oil on their rotary engine, but I honestly don't remember so I can easily be mistaken
 

JRed

Site Donor 2021
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2,329
Location
Virginia
There's nothing that's all that different between the RX8 and the RX7. Honestly, I'd use 10w-40 dino and I'd also premix the gas with either motor oil or TCW3. The Apex seals need all the help they can get, as those engines are not long lived.
 
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5,941
Location
Arlington
Honda rotary? Suzuki had a Wankel rotary engine, but I cannot remember a Honda rotary. FTR, before I knew better, I ran Castrol Syntec 5W50 in my 12A. I never had any problems which either says a lot about how good the 12A was or how overrated the early Group III Syntec was. I know better now. Don't use synthetic.
 
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3,517
Location
Austin, TX MSA
You can use synthetic if you plumb up a separate tank for the oil injection system, and put something like TC-W3 in that tank. That will keep the apex seals happy. Or just use dino, way less of a PITA. Today's dinos are excellent oils.
 
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2,804
Location
NJ
wankel engines favor dino, easier to burn off and lubricate apex seals. Synthetics are more resistant to burn off. Mazda sells a semi syn that is ok for use in the rx8
 
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