Rep Power: 776

why do they not like synthetics?

 
Rep Power: 0

Well it's not actually true anymore. The problem has always been that original synthetics didn't burn properly. Since rotaries require a mixture of oil in the combustion process to lube the apex seals this was a problem. The burn would leave extra carbon on the housing causing cracked seals.

Newer synthetics actually do burn cleanly and can be run in a rotary. I personally run 5w40 now. There are still some who disagree and won't touch synthetic with a rotary, but hey whatever works for you.

Raven

 
Rep Power: 765

was just about to say the same, theres always the option of running a second resivoir for oil just for the apex seals, so you cna run synthetic the rest of the engine.

 
Rep Power: 0

Well that's possible I don't see how feasiable it would be. You would need to hook up a resevoir to the MOP inlet and pressurize it. Essentially a lot of extra components for no real gain. If people are that concerned about burning synthetic just shutdown the MOP and run premix only, or don't use synthetic at all.

Raven

 
Rep Power: 772

yeah mixing the oils an okaayyy idea, except that oil is an octane reducer, bad for turbo rotaries..

Its not hard to set up a separate resevoir for the oil metering pump.. though I forget it might only work on the mechanical ones,, just need a little adapter and a tank of some sort. But you cant deny injecting two stroke oil will be better for your seals then injecting the crap in the oil pan.

edit: Otherwise, I've heard royal purple leaves the least deposits out of all synthetic oils.

 
Rep Power: 702

so wats the best oil 2 use then?

 
Rep Power: 802

I add about 0.5L of 2 stroke oil per 50L fill-up in my RX-7. The additional oil helps lubricate the seals.