Which Motor Oil
Which Motor Oil
I am ready to do the first oil change in my recently acquired FD. I have read a number of posts, but am unsure which oil to use. I have read of folks using Royal Purple, but that is a synthetic. The owners manual says not to use synthetic (of course that was 1994). Any recommendations? Thanks, Bill
From the 2nd gen FAQ:
Can I use synthetic oils in my Rotary engined car?
Yes and no. Mazda officially does not recommend the use of synthetic oils in rotary engines, however, long term and racing use has shown that the better synthetics (Redline, Amsoil, Neo, Royal Purple, Mobil1) are perfectly fine to use in a rotary engine, and will generally result in a 1 to 2% horsepower gain. However use of poor quality synthetics (like Valvoline, Castrol Syntec, Havoline, Etc) will result in build up due to high ash content left from these oils when they are burned. It is believed that is why Mazda did not recommend synthetics, because the couldn't pick favorites.
Other notes:
The Mazda Factory racing departments recommend and use ‘synthetic’ oils including the winning 1991 Leman’s 20-G 4 rotor Mazda 787B.
MazdaComp USA printed manual (now Mazdaspeed) recommends the use of synthetic oils for racing conditions.
Redline, Amsoil and Royal Purple Synthetic Motor Oils have been used in rotary engines (both race and street) for ten plus years with excellent results.
Most Synthetic Motor Oil is compatible with the bearing material, sealing elastomer's, and combustion seals used in a rotary engine.
Yes and no. Mazda officially does not recommend the use of synthetic oils in rotary engines, however, long term and racing use has shown that the better synthetics (Redline, Amsoil, Neo, Royal Purple, Mobil1) are perfectly fine to use in a rotary engine, and will generally result in a 1 to 2% horsepower gain. However use of poor quality synthetics (like Valvoline, Castrol Syntec, Havoline, Etc) will result in build up due to high ash content left from these oils when they are burned. It is believed that is why Mazda did not recommend synthetics, because the couldn't pick favorites.
Other notes:
The Mazda Factory racing departments recommend and use ‘synthetic’ oils including the winning 1991 Leman’s 20-G 4 rotor Mazda 787B.
MazdaComp USA printed manual (now Mazdaspeed) recommends the use of synthetic oils for racing conditions.
Redline, Amsoil and Royal Purple Synthetic Motor Oils have been used in rotary engines (both race and street) for ten plus years with excellent results.
Most Synthetic Motor Oil is compatible with the bearing material, sealing elastomer's, and combustion seals used in a rotary engine.
That is one of the favorite rotary owner's debates that will generate a hundred page thread very easily.
Here is a link to 3rd gen FAQ
https://www.rx7club.com/3rd-generation-specific-1993-2002-16/faq-3rd-gen-other-useful-links-68640/
3rd gen Archives:
https://www.rx7club.com/3rd-gen-archives-73/
old oil thread:
https://www.rx7club.com/3rd-gen-archives-73/synthetic-oils-good-bad-23430/
Here is a link to 3rd gen FAQ
https://www.rx7club.com/3rd-generation-specific-1993-2002-16/faq-3rd-gen-other-useful-links-68640/
3rd gen Archives:
https://www.rx7club.com/3rd-gen-archives-73/
old oil thread:
https://www.rx7club.com/3rd-gen-archives-73/synthetic-oils-good-bad-23430/
Joined: Jul 2008
Posts: 2,515
Likes: 4
From: San Jose, CA (NorCal/S.F. Bay Area)
Which to use is always debatable.
I'll just tell you what I use.
NAs - Valvoline non synthetic conventional motor oil. 20-50 or straight 50w
Turbos - Idemitsu Rotary Racing Oil. 20-50.
I'll just tell you what I use.
NAs - Valvoline non synthetic conventional motor oil. 20-50 or straight 50w
Turbos - Idemitsu Rotary Racing Oil. 20-50.
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