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Mazda RX8 Engine Oil and Lubrication Products

Mazda RX8 engine oil and lubrication products selected for the demands of the rotary engine, covering scheduled servicing and specialist maintenance needs. Whether you’re chasing the best oil for RX8 ownership or sourcing a specific product for an upcoming service, this range covers what the 13B needs.

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$ 20 — $ 13000

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Two angled white RX8 80W-140 gear oil bottles with FORTEC Racing Gear labels

FORTEC Full Synthetic Differential Oil SAE 80W-140 GL-5 (2 x 1L Bottles) for Mazda RX8 (Series 1 & 2, 2003-2012)

Full synthetic GL-5 lubricant in the correct 80W-140 grade for RX8 rear differential servicing. Two 1-litre bottles supply the full service quantity.

$100

Mazda RX8 gearbox oil in two FORTEC Spec R 75W-90 bottles

FORTEC Full Synthetic Gearbox Oil Spec R SAE 75W-90 GL-5 (2 x 1L Bottles) for Mazda RX8 (Series 1 & 2, 2003-2012)

Fresh Mazda RX8 gearbox oil in a two-litre service pack. Full synthetic 75W-90 GL-5 formula for smooth shifts and lasting gearbox protection.

$100

Mazda RX8 oil additive HKS ADD-II 200ml silver can with black cap

HKS ADD-II Engine Oil Additive 200ml for Mazda RX8 (Series 1 & 2, 2003-2012)

Organic molybdenum treatment that reduces friction and targets dry-start wear in the Renesis rotary. A considered addition to any RX8 oil service.

$45

CUSCO RX8 gearbox oil metal can with 75W-85 front label and white cap

CUSCO Super Sports Gearbox Oil with Neo 2L for Mazda RX8 (Series 1 & 2, 2003-2012)

Fresh 75W-85 manual transmission fluid keeps synchros sharp and shift feel consistent through spirited road use and track days alike.

$120

Two RX8 limited slip differential oil CUSCO 80W-90 tins standing side by side

CUSCO Super Sports LSD Oil with Neo 2L for Mazda RX8 (Series 1 & 2, 2003-2012)

Fresh RX8 limited slip differential oil in the right volume. Suits the OEM Torsen diff and clutch-type LSD upgrades, eliminating chatter and protecting gear sets.

$120

Close-up front label of black Mazda RX8 0W-30 oil metal tin

R-MAGIC Racing Energy Oil for NA Rotary 0W-30 5L for Mazda RX8 (Series 1 & 2, 2003-2012)

Ester-based, near-zero ash 0W-30 rotary engine oil in a 5L pack. It is formulated specifically for the Renesis to protect apex seals from cold start through sustained high-rpm use.

$190

Blue RX8 oil filter OX-02 beside upright GREDDY TRUST retail box

GREDDY TRUST Oil Filter for Mazda RX8 (Series 1, 2003-2008)

Double-pleated filter media captures more particulate across the full service interval, giving your Renesis a clean, known-condition start every oil change.

$25

Front close-up of blue GREDDY RX8 oil filter marked OX-05 against boxed filters

GREDDY TRUST Oil Filter for Mazda RX8 (Series 2, 2009-2012)

Double-pleated filter paper expands media area for superior oil cleanliness across every service interval on the Series 2 Renesis.

$25

RX8 magnetic sump plug with GReddy black hex head, threaded body and separate sealing washer

GREDDY TRUST Super Magnetic Oil Pan Sump Plug for Mazda RX8 (Series 1 & 2, 2003-2012)

A 5000 gauss neodymium magnet intercepts fine ferrous debris at every oil change, protecting Renesis apex seals and bearings between service intervals.

$70

Top view of RX8 magnetic diff plug beside sealed R-MAGIC packaging

R-MAGIC Super Magnetic Differential Drain Plug for Mazda RX8 (Series 1 & 2, 2003-2012)

Swap the stock diff drain plug for a super magnetic unit that collects metal particles, turning every oil change into a real condition check.

$70

RX8 magnetic drain plug beside sealed R-MAGIC Super Drain Bolt packaging, top view

R-MAGIC Super Magnetic Gearbox Drain Plug for Mazda RX8 (Series 1 & 2, 2003-2012)

Captures ferrous gearbox debris at every oil change, turning a routine service into a useful condition check for your RX8 transmission.

$50

What owners are saying

AUTOEXE Sports Steering Wheel (Red Stitch) for Mazda RX8 (Series 2, 2009-2012) AUTOEXE Sports Steering Wheel (Red Stitch) for Mazda RX8 (Series 2, 2009-2012)

I recently installed AutoExe's Sport Steering Wheel on my ND. Taking my time and watching the various video's a few times, it took me a little over an hour, with no real issues, to install the new wheel. I couldn't be much happier with it. The wheel is extremely well made, at least as nice as OEM, with red stitching that matches my SRC paint nicely. It's a tiny bit smaller in diameter than stock, but much thicker, with a mild D shape for additional leg room. For those considering an improved steering wheel, this is a fabulous option in my opinion, particularly if you have red car.

GENUINE MAZDA OEM Intake Solenoid for Mazda RX8 (Series 1 & 2, 2003-2012) GENUINE MAZDA OEM Intake Solenoid for Mazda RX8 (Series 1 & 2, 2003-2012)

Happy 8's day people! For you series 2 owners, here's the easiest way I found to change these little suckers. RX8 Upgrades providing the genuine goods as always. Remove the air box/ CAI, remove throttle body and remove the top part of the UIM only, this will get you easy access to the solenoids. Now you could remove them from this point, but removing the oil filler neck along with the vacuum chamber the solenoids mount to makes it FAR easier to change them. This whole job can be done in an afternoon for a mechanically minded person. On reassemble, don't forget to place the vacuum reference back onto the bottom of the manifold (has a green check valve) otherwise no valve will work. Reassemble and enjoy. PN is KL01-18-741 for those chasing the part

AUTOEXE Premium Cat-Back Exhaust Muffler for Mazda RX8 (Series 1 & 2, 2003-2012) AUTOEXE Premium Cat-Back Exhaust Muffler for Mazda RX8 (Series 1 & 2, 2003-2012)

Just installed my spanking new Autoexe Stainless Muffler, and here's a short take of my initial impressions: The Autoexe catback is lovely - very unique 2 box design and the tips are the tapered kind (ie cut at an angle) each lasercut with the Autoexe logo. Very nicely polished midpipe which connects beautifully (and easily) with the exhaust outlet. Most importantly, the exhaust tips have a perfect visual alignment, unlike other exhausts i've seen where one tip protrudes out more than the other. The Autoexe definitely doesn't have this problem. Also, the 2 box design has a lower profile than stock. Previously, i used to scrape and even dent the exhaust box when clearing humps or even parking - not so with the Autoexe. The Autoexe performs really well, at least on my AT. There is a noticable increase in low end torque, and the car just feels substantially lighter. Revs are much more responsive, and the slight lag felt when launching the car seems to have melted away. Linear acceleration is also much faster (at least across 1st 3 gears), and i'm reaching 120-130kmh much faster on 2nd gear alone (NB mine is the 4spd AT). I'm very pleased with the low-torque gains on the Autoexe - finally i have that slight 'lurch' from start which the manuals seem to have, but the ATs don't. The Autoexe starts off idle with a really low, bassy growl. When first installed, it was barely audible, but sounds louder now. In time, the db will increase to an extent. On higher RPM revs, exhaust sounds deep and wet, and def not those shrilly Remus' we hear on the expressways from time to time. Installation was a breeze, and took under an hour at Monster Garage at Ubi, who's the only authorized dealer in Singapore, so these guys know their stuff. The torque/hp improvement was a shocker esp on low end, esp when mine's an AT. I've heard of bros installing Fujitsubos and HKSs that have either no or negative benefit. In this respect, I'm mighty pleased with the Autoexe. Sound is not loud, but a soft low bassy growl when idle, which develops into a mature wet sound at higher revs.

The rotary engine has lubrication demands that set it apart from a conventional piston motor. For example, the 13B burns a small amount of oil by design. This is part of its apex-seal lubrication system. In addition, it runs at high rpm more freely than almost any production engine ever built. It also generates heat in a combustion chamber geometry unlike anything else on the road.

Therefore, choosing the right Mazda RX8 engine oil is one of the most consequential service decisions an owner makes. It deserves more than a generic pick off a shelf.

Why lubrication matters more in a rotary

Without pistons, a conventional crankshaft or valve train, the 13B relies on oil to protect the eccentric shaft, bearings, rotor housings and apex seals. Moreover, conditions vary enormously between a cold street commute and a hard track session. An oil that is too heavy can starve high-speed components at operating temperature. Meanwhile, one that is too thin offers insufficient film strength under sustained load.

The 13B’s tolerances and thermal behaviour differ fundamentally from the cars most general service guides are written for. As a result, RX8 engine oil selection matters in ways it simply does not for a conventional motor.

Choosing the right oil for your RX8

  • First, confirm the viscosity grade suited to Australian climate conditions and your typical operating range, then check against your owner’s documentation and each product’s details
  • Also, confirm compatibility with the 13B’s pre-mix or metered injection system, which introduces oil directly into the combustion chamber as a normal part of engine function
  • In addition, look for a proven track record with the rotary community. The right Mazda RX8 engine oil is backed by real-world use, not just a specification sheet
  • Finally, consider a suitable service interval for your use case. This applies whether you do light road driving, spirited back-road runs, or track days where oil temperatures climb and stay there

Sourcing engine oil for your Mazda RX8 in Australia

Getting the right product to your door without compromise on quality matters as much as the oil choice itself. However, quality is only part of the equation. Each product in this range is listed with the details you need to confirm suitability before you order. Therefore, cross-reference with your service history, current engine condition, and any specialist advice specific to your build stage or mileage.

For factory lubrication specifications, Mazda Australia publishes owner resources and service guidance for your vehicle. Because the rotary rewards consistent, attentive servicing, it all starts with getting Mazda RX8 engine oil right.

If you are planning a broader service or refresh, the lubrication products here pair naturally with other maintenance items across our range. In addition, keeping oil-related consumables current is the foundation everything else is built on.

Frequently Asked Questions

What type of engine oil does the Mazda RX8 need?

The RX8's rotary engine has different lubrication demands to a conventional piston engine. Mazda specifies an oil grade and type in the owner's documentation, and that guidance is the correct starting point. Oil condition, service history and how the car is used can all influence the best choice for a given vehicle.

Can I use any 10W-40 or synthetic oil in my RX8?

Not all oils marketed for general use are appropriate for the rotary engine. The Renesis engine uses oil differently to a piston engine, including burning a small amount of oil as part of its normal operation, so viscosity grade and formulation both matter. Always cross-check the product details against Mazda's owner documentation before purchasing.

How often should I change the engine oil on an RX8?

Mazda's service schedule sets the baseline interval, but many RX8 owners service their oil more frequently given the rotary engine's operating characteristics and its sensitivity to oil quality. The car's condition, use, and whether it sees track or hard street driving are all worth factoring into your service plan.

Does the RX8 rotary engine consume oil between services?

Yes. The Renesis rotary engine burns a small amount of oil as part of its normal operation, used to lubricate the apex seals. Checking the oil level between services is standard practice for RX8 ownership, and topping up with a compatible oil is part of routine maintenance.

What oil-related products do I need for a full RX8 service?

A complete lubrication service typically involves engine oil and an oil filter as a minimum. Depending on the service scope and the car's condition, additional oil-related items may be required. Reviewing each product's details against your planned service work helps confirm you have the right items before starting.

Is there a recommended oil for RX8 owners who track their car?

Track use places greater thermal and mechanical demands on engine oil, which can shorten effective service life compared with standard road use. Reviewing product specifications carefully and consulting Mazda's guidance is the right approach; some owners running their RX8 hard choose to reduce service intervals alongside any oil selection decision.

Can I mix different engine oils in my RX8 if I need to top up?

Mixing oils of different grades or formulations is generally not recommended. If a top-up is needed between services, using the same oil already in the engine is the preferred approach. If that is not available, confirming compatibility with the existing oil's specification before adding anything is worthwhile.