actually, now that I remember it, a high performance outboard engine place tried

5 different oils in 5 different engines and RP was dropped from the test because the

engine it was in ran so badly, smoked like crazy, fouled out the plugs and the gases made

the people sick. They took the RP out and put another brand of synthetic in and it ran great again.



Thats the same oil alot of people use when they pre-mix. I would use the Amsoil 2 cycle oil.

CASTROL GTX HIGH MILEAGE 20W-50 NICE AND THICK!

I've never run their motor oil but I've use RP's gear oil and the stuff is some of the best I've come across.

There was a rotory magazine from Australia that tested RP and some other

synthetics, and RP didnt fare that well at all. I think its one of those things

that people just assume because they read about it on forums so they think

it has to be good.



Kind of like my extended life anti-freeze, people with nothing to back it up

say its bad for a rotory, meanwhile I have been using it for about 7 years now.

Yeah it seams to me its one of those things people jump on.

I was just wondering cause i have been seeing the comercials so much

just wanted to know if any of you have tried it.

Well I have seen several shows on tv where the car is brand new, with new oil and they dyno it and then they changed to RP and dynoed it again and the cars on average gained over 10rwhp..... I have heard that several people using it see a big drop in oil temps.... Well I'm just giving it a shot...I'm sure I won't be able to afford to use it for much longer https://www.nopistons.com/forums/pub...DIR#>/wink.png

Racing Beat recently switched from Selling/endorsing Amsoil to Royal Purple, apparently they have had good results with it...



""Racing Beat has been recommending the use of synthetic oils in rotary applications for several years. Our research has found that synthetic oils provide superior friction reducing between sliding surfaces, reduced foaming, and lower oil temperatures. We have tested several different synthetic oils and have found that while most offered improved wear and lower oil temperatures, none offered any horsepower gains... except for Royal Purple!



Our in-house testing has yielded up to a 2% performance increase after changing from mineral-based oil to Royal Purple Synthetic Motor Oil. How could this be? Jim Mederer, co-founder and chief engineer at Racing Beat, was truly puzzled. With over 35 years of professional racing experience under his belt, he has seen and tried just about every “new” lubricant that hits the market. All offered better wear and lower oil temperatures but none offered any horsepower improvement. After spending time consulting with the engineers at Royal Purple to better understand the reason for the horsepower gain, it was explained that the secret was the proprietary ingredient “Synerlec”. This Synerlec ingredient provides an ultra-slick film on internal engine components to significantly reduce power-robbing friction. Less friction equals more power!



Other professional engine builders have confirmed that Royal Purple Synthetic Racing Oil delivers measurable horsepower gains. Independent dyno tests show increases up to 5% (on smaller displacement engines) with nothing more than an oil change.



Give Royal Purple a try with your next oil change! ""



Sounds like it works, but I still use Castrol 20-50 and change the oil every 1500-2000 miles - I can't break the old habits, and I have never had problems.



Even in my piston engined "race" car I use valvoline strt 40-wt, non synthetic. If you change your oil often I can't see the synthetic benefits

This is some of what was said after testing TCW-3 which is what everyone uses for pre-mix:



All of these engines were used on research boats. With the exception of the 200 hp, they all spent the majority of their time working at low rpms pulling nets or other gear. The Royal Purple was used on one of the 150 HP. It was dropped from the test after 50 hours. It smoked badly, fouled plugs, and generally made the crews nauseous. It was replaced by the Redline Watercraft oil. The change was dramatic, the smoke was reduced to almost nothing, the plugs were lasting 200+ hours, and the crews were happy



Another did a test of all different synthetics, the results of the wear test resulted in RP coming in at #10 out of 11.



I guess it doesnt matter, people will use what they hear from someone else to be best. I would say that Mazdatrix did what anyone else would do in thier position and went with the company who gave them the better deal. They probably werent making any money selling Amsoil because its fairly simple for any shop to get a commercial Amsoil account and buy right from them.

Danm you guys really did your home work.

https://www.nopistons.com/forums/pub...R#>/unsure.png

so bottom line is.. which to use best on an fd https://www.nopistons.com/forums/pub...DIR#>/wink.png what should i use, it dont get very cold here (houston,tx) so whats best to use on my car, i been using non-syn. 10w40 https://www.nopistons.com/forums/pub...IR#>/wacko.png