Rotary Car Club - View Single Post - 5w-20

I8U · 06-11-2008, 08:24 PM

The only reason Mazda recommends 5w-20 is solely because of emissions standards and fuel economy. I use 5w-40 during the summer months along with 6oz of 2-stroke oil in my fuel and have never had a problem with this engine. My motor runs extremely strong and with the numbers from my last compression check I can back up my claims. I have had this motor for just over 26k miles and have run premix and thicker oil in the summer and 5w-20 in the winter and not had one problem.

But really, there has been debate on the oil weight ever the 8 was introduced...everybody has an opinion on the subject.

06-11-2008, 08:24 PM	#2
I8U KONI Challenge Crew Join Date: Mar 2008 Location: Goldsboro, NC Posts: 126 Rep Power: 18	The only reason Mazda recommends 5w-20 is solely because of emissions standards and fuel economy. I use 5w-40 during the summer months along with 6oz of 2-stroke oil in my fuel and have never had a problem with this engine. My motor runs extremely strong and with the numbers from my last compression check I can back up my claims. I have had this motor for just over 26k miles and have run premix and thicker oil in the summer and 5w-20 in the winter and not had one problem. But really, there has been debate on the oil weight ever the 8 was introduced...everybody has an opinion on the subject. __________________ 04 TiGray RX8 MT, LS2 coil setup, 3" midpipe, HKS Hi-power 3" exhaust, TEIN S-Techs, Hotchkis Adj F/R sways, K&N Typhoon V2, Steel braided brake lines, Redline drivetrain fluids, ATE Super Blue brake fluid, Cobalt XR2/GTS brake combo, MB Motorpsorts Weapons 18x9 +45 offset, 275/35's I Support the KONI Sports Car Challenge!