My car is of course, a Mazda; specifically it's an RX8. The rotary engines are known as oil burners quite simply because they do so by design. Then engine has a computer controlled pump (oil metering pump or OMP) that injects oil onto the rotor apex seal surfaces and the volume injected is based upon driving conditions and temperature. Hard driving one could burn a quart in < 1000 miles. Normal driving, a quart in 3,000 miles.
Mazda recommends agains using synthetics in these rotaries, so I use Amsoil's XL 5w30 (in summer) and 5W-20 in all other seasons. Others use synthetics with no reported issues.
One modification many enthusiasts do to these cars is install a bypass adapter to the OMP and supply 2cycle oil to the engine from an underhood mounted reservoir. I've not made that modification but I'm considering it.
Another thing rotary enthusiasts often do is put 4-8 oz of 2 cycle oil in the gasoline tank. In fact, Idemitsu makes a 2cycle oil specifically for this purpose. I use Amsoils Saber Pro as it has the same or better ratings than the Idemitsu product. I also use FP+ mixed with the 2 cycle. I run about 5 1/2 oz of that mixture per 12.5 gallons of gasoline.
The designed in oil burning causes issues with the rotary apex seal springa (the seals and springs are the rotary's equiv to piston rings) in that carbon formation, there and in the exhaust ports, occurs over time.
My questions are....if I install the OMP bypass adapter, would it be safe to mix in very small doses or Auto-RX to help combat the carbon build up?
If I don't install this, would using maintenance doses in the oil pan along the the Amsoil-XL be helpful in reducing this carbon buildup?
I'm sure this isn't an easy question to answer, so it'll probably involve opinions, which too are welcomed.
Mazda recommends agains using synthetics in these rotaries, so I use Amsoil's XL 5w30 (in summer) and 5W-20 in all other seasons. Others use synthetics with no reported issues.
One modification many enthusiasts do to these cars is install a bypass adapter to the OMP and supply 2cycle oil to the engine from an underhood mounted reservoir. I've not made that modification but I'm considering it.
Another thing rotary enthusiasts often do is put 4-8 oz of 2 cycle oil in the gasoline tank. In fact, Idemitsu makes a 2cycle oil specifically for this purpose. I use Amsoils Saber Pro as it has the same or better ratings than the Idemitsu product. I also use FP+ mixed with the 2 cycle. I run about 5 1/2 oz of that mixture per 12.5 gallons of gasoline.
The designed in oil burning causes issues with the rotary apex seal springa (the seals and springs are the rotary's equiv to piston rings) in that carbon formation, there and in the exhaust ports, occurs over time.
My questions are....if I install the OMP bypass adapter, would it be safe to mix in very small doses or Auto-RX to help combat the carbon build up?
If I don't install this, would using maintenance doses in the oil pan along the the Amsoil-XL be helpful in reducing this carbon buildup?
I'm sure this isn't an easy question to answer, so it'll probably involve opinions, which too are welcomed.
