I have tuned and played around with MANY non rotary turbo cars in the past. Synthetic Oil is GREAT for turbocharged cars because it holds up better under high temperatures. My opinion is if the new synthetic oils don't leave ash desposits then it would be very advantageous to use synthetic oils in a turbo rotary.



One thing to be aware of is that in my experience synthetic oils will make all of your existing oil leaks a bit more severe is some cases. I'm not sure why this is.



I ran synthetic oil on a turbo volvo for 250,000 miles and the engine and turbo both performed like new the whole time. That's a long life for a turbocharger.



-John Magnuson

 

I have been running mobil 1 15w50 since day 1 on this motor.

 

20W50 during the summer. 10W30 for the winter....

 

Synth right? I did 10W30 swynth this summer. Should I go thicker? Even if it's synth?

 

Two things:

First. What does one consider cold? I live in Ventura CA and it dosent really go below 60, 50's is news worthy. so are you saying 20-50(syn) would be best?

Second. Its good info to hear what the guys use in their race vehicles, but for us daily drivers there is still a bit of doubt since those guys change their oil before and after an event. Any body ever talk to some one who deals with alot of daily drivers?

 

The viscosity is not a measure of how fast the oil breaks down, just on it's ability to flow. A stock motor should have 10w-30 (winter) to keep the oil flow rate up. Moving more oil should keep the oil temps down since it is not in contact with a hot surface for as long. Also would decrease localized oil hot spots. If you have ported oil passages then maybe go to a higher viscosity. That at least how I've rationalized it but maybe I'm full of crap...

 

"Viscosity is a measure of the "flowability" of an oil. More specifically, it is the property of an oil to develop and maintain a certain amount of shearing stress dependent on flow, and then to offer continued resistance to flow. Thicker oils generally have a higher viscosity, and thinner oils a lower viscosity. This is the most important property for an engine. An oil with too low a viscosity can shear and loose film strength at high temperatures. An oil with too high a viscosity may not pump to the proper parts at low temperatures and the film may tear at high rpm. " From here



So what temps really call for what oil weights? I Don't drive my car in the winter, but its MN, temps will range from 40-100 degrees F. I have always used 10w-30.

 

eBay. It's cheaper than your local speed shop...

http://cgi.ebay.com/ebaymotors/ws/eBayISAP...1874883694&rd=1



The synthetic is better for the turbos which are about the same price as the motor...



Royal Purple is quoted on Mazda's web site (during SevenStock) that synthetic is fine for rotaries...

 

What do u guys think about synthetic 2 cyc premix?

 

MY mechanic had syn in his 81 Gsl for 12 years, uses syn in everthing , he has it in his 94 now for 6+ years with amsoil 2 cycle oil to the oil metering pump. Syn in his turbo charged 1400 cc Kaw Z1 motorcycle for 22 years . I trust his experience, I have it in my 88 vert, and my newer Honda civic.( keeping the miles off the 2dn gen )He has never had an oil related failure.