What type of oil do you use in a 1984 Mazda RX7?

Answer 1

many will give a different answer but for early rotary engines - mineral oil is best. depending on your local climate will determine how viscous the oil should be. The first number is the viscosity when the oil is cold, the second number is the oil is at operating temperature. The Higher the number the thinker ther oil. 10w-30 or 10w-40 will suffice in most temperate climates in climates that regularly see minus dgrees then a lower viscosity oil must be used - like a 5w-10 for example. in really arid climates you may need an oil that is more viscous like 20w-50 for example. rotary's are very particular about their oil so if you want to be look after the engine then there are racing oils you can use that will offer more protection. for example im told that Purple Royal make very good oil. they are based in the UK. Answer The reason mineral oil is deemed better is the opinion that synthetic oil will not burn cleanly in the combustion chamber. There are people who use synthetic and have no problems. Personally I use 5W-30 amsoil synthetic, oil metering pump disabled and premixed fuel.