Race-bred oils since 1979

The right Maxima
for your machine.

Q: Fork Oil or Racing Fork Fluid?

Both are mineral fluids. Fork Oil (5 to 20wt) is for cartridge and standard forks; Racing Fork Fluid (5 to 15wt) is the higher-spec fluid for high-performance forks. Harley owners get V-Twin Fork Oil. Match the weight your service manual calls for.

Q: Chain Wax or Synthetic Chain Guard, and what does shipping cost?

Chain Wax is Maxima's paraffin formula for very dry and very wet riding with minimal fling-off; Synthetic Chain Guard is a clear full-synthetic lube for all conditions. Shipping is $10 flat rate, free over $75.

Maxima has formulated, blended and bottled its own oils in Santee, California since 1979. Castor 927, Formula K2 and Super M for two-strokes, Pro Plus+, Extra and 530MX for four-strokes, V-Twin oils and Harley-Davidson oil change kits, side-by-side kits, fork fluid, chain lube, filter oil and SC1.

Shop by job Find oil for my ride

$10 flat-rate shipping, free over $75 Fit matched to your machine

Shop by job

The whole maintenance aisle

4-stroke engine oilPremium, SynBlend, Pro Plus+, Extra and 530MX, plus ATV and SXS oils and side-by-side kits.Shop 4T → 2-stroke premix & injectorCastor 927, Formula K2, Super M and Premium 2, with injector versions.Shop 2T → V-Twin oils & kitsV-Twin Mineral, Syn Blend and Full Syn, primary and transmission oils, Harley-Davidson oil change kits by engine.Shop V-Twin → Fork & shock fluidFork Oil 5 to 20wt, Racing Fork Fluid, Racing Shock Fluid and V-Twin fork oil.Shop suspension → Gear & transmissionMTL trans and clutch fluid, Premium and Synthetic gear oil, SXS gear and drive fluids.Shop gear oil → Chain careChain Wax, Synthetic Chain Guard, Clean Up and combo kits.Shop chain → Air filter oil & cleanerFFT foam filter oil, Fab-1 aerosol filter oil and Air Filter Cleaner.Shop filter care → Wash & detailSC1 high-gloss coating, Bio Wash, Bio Foam, Speed Wax and Suspension Clean.Shop detailing →

Also from Maxima: assembly grease, assembly lube and MPPL, DOT 4, Racing DOT 4, DOT 5 and DOT 5.1 brake fluid, Coolanol, Off-Road Coolant and Cool-Aide and Hi-Test octane boost.

Pick your oil

Maxima's own ladder, two-stroke and four

Oil	Engine	How Maxima describes it
Castor 927	2-stroke premix	Castor-based, ester-fortified oil for the most severe conditions. The one Maxima is best known for.
Formula K2	2-stroke premix / injector	Full-synthetic triple-ester race oil that burns clean. K2 Injector for oil-injected bikes, or premix at the OEM ratio.
Super M	2-stroke premix / injector	Semi-synthetic ester oil, low smoke, rated JASO FD. Super M Injector for oil injection.
Premium	4-stroke	Maxima's mineral four-stroke oil, JASO MA2 wet-clutch rated.
SynBlend	4-stroke	Semi-synthetic ester oil, the middle step, JASO MA2.
Pro Plus+	4-stroke	Full-synthetic, ester-fortified, API SN PLUS and JASO MA2.
Extra	4-stroke	Full-synthetic triple-ester oil for the most severe conditions.
530MX	4-stroke MX	Triple-ester oil built for motocross and off-road race conditions.
ATV / SXS oils	Quads and side-by-sides	Formulated for ATV and SXS engines; quick-change kits bundle the oil, a filter and crush washers by model.
V-Twin oils	Harley-Davidson and other V-twins	V-Twin Mineral, Syn Blend and Full Syn, plus primary and transmission oils and oil change kits by engine family.

Popular picks

Maxima on most of our shelves

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Why Maxima

Blended by the company on the label

Since 1979, Santee, California. Maxima was founded in 1979 after founder Dick Lechien's son Ronnie ran into lubrication problems racing. It is still privately held and still formulates, develops, manufactures and distributes its own oils, lubes and care products rather than relabelling someone else's.

Fitment charts, not guesswork. Maxima publishes application charts for its SXS oils, V-Twin oils and oil change kits, and names the Harley-Davidson kits by engine family: Evolution, Sportster, Twin Cam and Milwaukee-Eight. We mirror those names in our listings.

What Corban reaches for. Castor 927 on race day, Pro Plus+ in the four-strokes, FFT in the filters and SC1 after the wash. If you ride in Colorado winters, pick Coolanol or Off-Road Coolant; Maxima's Cool-Aide is a race coolant with no freeze protection.

Founded 1979Privately held, headquartered in Santee, California.

PEAC

Maxima's 4T additive packagePEAC is Maxima's name for the friction-modifier, antioxidant and dispersant technology in its four-stroke oils.

H-D

Kits by engine familyEvolution, Sportster, Twin Cam and Milwaukee-Eight kits with a ProFilter filter and crush washers.

Good to know

Maxima questions, answered

Castor 927, Formula K2 or Super M for my two-stroke?

Maxima describes Castor 927 as a castor-based, ester-fortified oil for the most severe conditions, Formula K2 as a full-synthetic triple-ester race oil that burns clean, and Super M as a semi-synthetic, low-smoke oil rated JASO FD. If your bike has oil injection, use K2 Injector or Super M Injector; K2 Injector can also be premixed at the OEM ratio.

Which Maxima four-stroke oil for my dirt bike, ATV or UTV?

From Maxima's descriptions: Premium is the mineral oil, SynBlend the semi-synthetic, Pro Plus+ the full-synthetic ester-fortified oil, Extra the triple-ester oil for the most severe conditions, and 530MX the triple-ester oil built for MX and off-road racing. ATV and SXS oils are formulated for those engines, and the SXS quick-change kits are model-specific.

Which Maxima V-Twin oil change kit fits my Harley?

Maxima names the kits by engine family: Evolution ('84 to '99), Sportster ('86 or '99 to current), Twin Cam ('99 to current) and Milwaukee-Eight ('17 to current). Pick the kit named for your engine; the filter colour is in the listing name. Our V-Twin oil category has all of them, and the Harley hub links straight to it.

Fork Oil or Racing Fork Fluid?

Both are mineral fluids. Maxima lists Fork Oil (5, 10, 15, 20wt) for cartridge and standard forks with its Lubricinol additive system, and Racing Fork Fluid (5, 7, 10, 15wt) as the higher-spec fluid for high-performance forks. Harley owners get V-Twin Fork Oil in 10 and 20wt. Match the weight your service manual calls for.

Chain Wax or Synthetic Chain Guard, and what does shipping cost?

Maxima positions Chain Wax (its ParaFilm paraffin formula) for very dry and very wet riding with minimal fling-off, and Synthetic Chain Guard as a clear full-synthetic lube for all conditions. Clean first with Maxima Clean Up, which is safe on O, X and Z-ring chains. Shipping is $10 flat rate, free over $75.