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Post by ziggystardust on Jul 7, 2012 14:50:45 GMT -5
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Post by gts1000 on Jul 16, 2012 18:36:14 GMT -5
Thanks, Ziggy. I have tried all the local suppliers now, without luck, so it looks like a trip to Halfords tomorrow. Do you use it in the "injector" oil tank too?
Cheers,
Biggles
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Post by bdalameda on Jul 30, 2012 22:13:34 GMT -5
This last weekend at the Laguna Seca MotoGP there was a 1975 RE5 in the Mazda Car booth on display. When I saw it I tracked down the person at Mazda that knew about it and we spent a couple of hours talking RE5's and also about Wankel Engines. He did not know a lot about the Suzuki but he was a long time Mazda R&D person and knew a lot about rotary engines. We discussed oils and I brought up the old questions of synthetic vs dino oils and what is best for a rotary engine. His take on the subject was interesting and very similar to my experience. Basically he said that the real lubrication demands for the sump oil and the injection oil are totally different. Synthetic oil in the sump is just fine but they have encountered some issues running some synthetics in the injection system. They have found that sythetic four-stroke oils can have too high a flash point when used for injecting into the engine intake and this can cause some issues with a sticky residue buildup in the engine and possible seal sticking. He is a big advocate of running synthetic two-stroke oils in an premix or a separate injection system such as on the RE5. He told me that they always run Yamalube synthetic oil mix in their race motors. The reason that they shy away from some synthetic oil recommendations in the cars is that the oil for the injection system in the cars is taken from the engine sump and not a seperate reservoir as the RE5 has. He said there is no issue running synthetic oil in the sump and two-stroke synthetic in the injection systems. He said he would shy away from running synthetic 4-stroke motor oil in the injection system. He has found that many sythetic four-stroke oils are fine in the rotary engine injection but a few brands have caused problems so Mazda tends to be conservative recommending oils - there are synthetic oils that are formulated for Mazda rotaries and can be run in the sump and injection without problems.
Dan
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Post by pmcburney on Aug 1, 2012 16:40:23 GMT -5
Hmmm...
Oil recommendations are like bums - everyone has one.
For me, it's simple.
I can still get Castrol GTX of the variety originally specified for RE's (it's actually manufactured by BP and can usually be purchased at any BP servo, for the Aussies here...).
Although usage rate from the injection tank is low, it's still a reservoir I have to put oil in and (here's the kicker) GTX is significantly cheaper per-litre than any synthetic two-stroke oil.
So, I know GTX is fine, and it's as cheap as chips. No-brainer really.
Unless GTX, or an equivalent four-stroke engine oil is unavailable in your area, I reckon you're just wasting money using anything else.
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