Question 1

What oil should I use in my RX8?

Accepted Answer

The RX8 rotary engine has specific lubrication requirements that differ from piston engines. A low-viscosity engine oil meeting Mazda's specification is recommended, as the rotary burns small amounts of oil intentionally for apex seal lubrication. Using a high-quality oil suited to the 13B-MSP and changing it regularly is one of the most important maintenance steps you can take for engine longevit

Question 2

How often should I change the oil in an RX8?

Accepted Answer

Most RX8 specialists recommend changing the engine oil every 5,000 km or every six months, whichever comes first. The rotary engine runs at high temperatures and the oil degrades faster than in a typical piston engine, so sticking to a strict interval matters more here than on most other cars.

Question 3

Does the RX8 use a standard oil filter?

Accepted Answer

The RX8 uses a specific oil filter thread and sizing that differs between Series 1 and Series 2 models, so it is important to confirm compatibility before purchasing. Using the correct filter ensures a reliable seal and proper oil pressure. Both genuine OEM and quality aftermarket filters are available for each series.

Question 4

What coolant does the RX8 take, and how often should I flush it?

Accepted Answer

The RX8 uses a long-life engine coolant compatible with aluminium cooling system components. A coolant flush every two years or as part of a major service interval is a sensible practice, as degraded coolant loses its corrosion inhibitors and can accelerate wear on the water pump, radiator and hoses.

Question 5

Should I use genuine Mazda filters or aftermarket filters on my RX8?

Accepted Answer

Genuine Mazda filters are manufactured to factory specifications and are a reliable choice for owners who want a known-condition part with correct fitment. Quality aftermarket filters from reputable brands can also be suitable, provided they match the correct thread, bypass valve pressure and filtration rating for the RX8's rotary engine.

Question 6

What transmission fluid does the RX8 use?

Accepted Answer

The RX8 six-speed manual gearbox and the automatic variant each require a specific transmission fluid type. Using the correct grade and specification helps maintain smooth shifts and protects the gearbox internals. Fluid condition should be inspected at each service, particularly on higher-mileage cars where the original fill may never have been changed.

Question 7

Is the air filter on an RX8 a standard service item?

Accepted Answer

Yes, the RX8 air filter is a regular service item and should be inspected and replaced at the manufacturer's recommended interval or sooner in dusty conditions. A clean, unrestricted air filter supports consistent fuelling and helps the engine management system operate as intended.

Question 8

Can a performance air filter improve throttle response on an RX8?

Accepted Answer

A high-quality performance drop-in air filter can offer marginally reduced intake restriction compared with a saturated original filter, which may contribute to a slightly freer throttle feel. The most reliable benefit, however, is simply starting from a clean, unrestricted filter rather than one that is past its service life.

Fluids & Filters