Recommended Oil and Gas for 1983 RX-7

Asked by May 24, 2013 at 01:53 AM about the 1983 Mazda RX-7 GS

Question type: General

What is the recommended oil type and octane gas for the 1983 Mazda RX-7?  Also is synthetic oil (i.e. Amsoil) recommended?..Thanx

3 Answers


Common weights are 10W-30 and 20W-50. On the underside of the hood is a decal with instructions on choosing the weight appropriate for where you drive. Also in your car's owner. Mazda recommends against using synthetic oil in the rotary engine. Stick with Dino oil and use synthetic grade oil in your differential. If your RX-7 is a turbo I would use the highest octane you can buy. Though you might be able to get away with using a lower ocatane depending on your driving style. Non Turbo, 87 octane is recommended.

Best Answer Mark helpful

Oil: any API SD/SE or higher spec mineral only oil with a viscosity of 10W-30 (for temperatures between -25 and +30 degrees C) or 20W-50 (for temperatures above -10 degrees C). Synthetic oil has a nasty habit of leaving more deposits when it is burnt, which happens due to the oil injection into the cobustion chamber to lubricate the rotor apex seals. Fuel: it will run quite happily on 95RON or 85MON fuel provided the timing is set correctly.

1 of 1 people found this helpful.

I use to race with these engines when I was younger, always used high test fuel and a good brand of engine oil, never used synthetic oil, we bumped up the oil injector feed rate, so we were consistently turning 8 to 10 grand on the tach during each run and never had an failure due to an oil problem. These little engines were a blast especially above 4 grand in the RPM's.

1 of 1 people found this helpful.

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