Motor Scooter Crank Case Oil

Hi Folks. This is the Motor scooter Crank Case Oil section. Lots of good information about quality motor scooter oil. Crank case oil... very important part of your motor scooter. Interestingly enough, there are crank case oils made specifically for motor scooters. Let's all support these companies by buying oil for our scooters made specifically for scooter use . . .

  • Preliminary information about oil . . .
  • A general recommendation for scooters would be 10W-40 or 20W-40 for outside temperatures up to about 90℉
  • When outside temperatures get higher than 90℉, or if you drive long and hard, you should consider 20W-50 oils.
  • The API SJ designation is a minimum standard that oil must meet and is marked on the container of engine oil.
  • API SJ motor oil suitable for use with turbochargers is well suited for scooter engines. Buy motor oil marked "turbo" or "turbo formula" for high heat applications.
  • "Energy Conserving" oil or "Aftermarket Oil Additives" should not be used with a wet clutch system.
  • "Aftermarket Oil Additives" should not be mixed with quality oils like Motul oil or other quality oils.
  • Do not use oils designated for use in automobiles or trucks in your motor scooter crankcase. Never use regular motor oil in the crankcase because of the wet clutch systems in most motor scooters. Pay the extra cost for proper oil and you will benefit in the long run.

  1. DUMONDE TECH OIL   This is worth looking into. Maybe their GP 4 would work well with most motor scooters, but you better double check this for use in your scooter.

    “GP 4 is specifically designed for Four Stroke street, road race motorcycles, quads and dual sports which incorporate the same lubrication for the engine and transmission. This is extremely important, because using other lubrication packages which are not specifically designed for this application, may damage engine or transmission components. GP 4 protects and cools engines. Eliminating preignition which causes damage and performance lose. GP 4 also noticeably increases ease of shifting of gear box and eliminates clutch fade. Availability: 30w, 40w, 50w, 10w-30, 15w-40 in Quarts, 1/2 Gals., Gallons. STOCK # 's 2802-2855.”

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    MOTUL SCOOTER EXPERT 4T OIL     Some people really like this oil for their 4-stroke motor. This company has a worldwide presence. Motul Scooter Expert 4T 10W40 Engine Oil.

    “The Technosynthese® formula of this specialized product protects the engine of 4-stroke scooters that run mostly in urban traffic-jams where their full fairing engine covers and the low speed generate high engine temperatures. They need the protection of an extremely efficient, low-wear and low-friction lubricant both to reduce friction-induced overheat and to improve thermal exchange between moving parts and outer casings.”
  3. ROYAL PURPLE OIL     Looks like this might be another quality oil. Specially formulated for cycles. This is a SAE 10W-40 synthetic oil.

    “Max-Cycle® is specifically formulated to significantly improve motorcycle engine (and transmission) performance. It's recommended for use in both air-cooled and liquid-cooled 4-cycle engines and it's compatible with wet-clutch transmissions. Formulated with select synthetic base oils and Royal Purple's proprietary Synerlec® additive technology, Max-Cycle® provides unparalleled film strength that is up to 400 percent stronger than the leading synthetic and mineral oils. Its shear stability and oxidation resistance promote greater performance and protection. Independent Test Lonview Inspection conducted a test to determine if switching to Royal Purple's Max-Cycle® would reduce motorcycle operating temperatures. Conclusion Switching to Max-Cycle® throughout the motorcycle reduced engine operating temperatures from 24 to 44 degrees F. Synerlec® greatly reduces engine wear - including ring, cylinder and bearing wear. It continuously adheres to metal surfaces, even after shutdown, to provide instant protection at startup until a full fluid film can be established. Max-Cycle® exceeds API / JASO new warranty requirements and is compatible with other mineral and synthetic motor oils. No flushing is necessary prior to use. It's available in 10W30, 10W40 and 20W50 viscosities”

  4. REDLINE SYNTHETIC MOTORCYCLE OIL   "As part of Red Line's all-new Powersports line, these High Performance Motorcycle Oils are fully-synthetic formulas specifically created for the high demands of the latest high-revving four-strokes motocross bikes and ATVs, Sportbikes, and V-Twins. Available in popular viscosities of 10W40, 20W50, and 20W60, these ester-based products contain the anti-wear chemistry demanded by mechanics and enthusiasts. The levels of zinc and phosphorus blended into these lubricants are among the highest in the industry and combine well with Red Line's chemistry, designed to seal piston rings for more power, fight fuel dilution, extend drain interval and provide stronger film strength over a range of temperature. This oil also features lower levels of friction modifiers for superior wet clutch operation. Excellent thermal stability, oxidation resistance, cleanliness, and ability to lubricate hot metal make Red Line High Performance Motor Oil a superior lubricant. Recommended for JASO MB, API SJ, SG, & SH". About viscosity grade selection: "The proper viscosity grade to use depends on many factors such as ambient temperature, miles on the engine, bearing and piston clearances, and type of service. A general rule of lubrication is to use the lowest viscosity possible which will provide the proper separation of metal. Anything more than this minimum will increase power loss due to friction and will reduce the pumpability of the oil at all temperatures. However, one must consider synthetics differently when determining viscosity requirements. At high speeds, a petroleum 5W30 can appear to be a 15W in the bearings due to the shear stress, yet Red Line 5W30 will actually be an SAE 30 in the bearings. There is a significant difference in lubricating an engine with a 30 compared to a 15W. Red Line Synthetic oil will provide better viscosity protection than the next higher petroleum viscosity grade.
    If clearances are tight and very little lugging occurs, then the 5W30 or 10W30 should be adequate.
    If ambient temperatures will regularly climb above 100°F, then the 10W40 would provide an additional safety margin.
    If the engine is air-cooled, or if the engine is older and has greater bearing and ring clearances, the 15W50 and 20W50 will develop a thicker oil film.
    If very low temperatures occur, the lower viscosity grades, (5W30, 10W30, or 10W40) will flow better and lubricate the engine more quickly after start-up".
  5. AMSOIL CORPORATE WEBSITE   "The original synthetic motor oil". They sell an oil specially formulated for motor scooters:   "Formula 4-Stroke® 10W-40 Synthetic Scooter Oil (ASO) formulated specifically to meet the special needs of today's high-tech air- and water-cooled 4-stroke motorized scooters. Offers unsurpassed wear protection and friction reduction for longer equipment life and cooler operating temperatures. Exceptional shear stability ensures consistent viscosity protection and provides additional protection for transmissions and gear boxes. Friction modifier-free formulation ensures wet clutch compatibility and smooth clutch operation. Special anti-corrosion additive package provides long-term protection during periods of inactivity and storage".
  6. CASTROL They sell a "motorcycle" oil which i suppose can be used in your motor scooter. "CASTROL Act-evo 4-Stroke" "Is suitable for all makes of motorcycle 4-stroke engines running on leaded or unleaded fuel". Maybe this would work with most or all motor scooters: CASTROL R4 SUPERBIKE is suitable for all makes of motorcycle 4-stroke engines, running on leaded or unleaded fuel. Key Benefits: Full synthetic. Ideal for highly tuned sports motorcycles ridden hard for extended periods. Releases additional horsepower and acceleration. Exceeds API SG, JASO MA. Or maybe: CASTROL GPS is suitable for all types of high performance modern Key Benefits A synthetic based oil. Allows for faster gear changing. Creates a tough, heat reactive layer of protection. Exceeds API SG, JASO MA.
  7. PENNZOIL MOTORCYCLE OIL   An SAE 10W40 oil. "Pennzoil® Motorcycle Motor Oil is a premium quality lubricant specially designed to protect motorcycle engines. Meets or exceeds warranty requirements for all 4-stroke motorcycle engines, including BMW, Harley-Davidson, Honda, Kawasaki, Suzuki and Yamaha, where JASO MA,or API SG or SH is recommended. Outstanding high-rpm, high-temperature protection. Thick and tough oil film to separate metal parts. Friction-fighting additives help minimize engine wear. Exclusive PennzStar molecule gives outstanding protection against viscosity and thermal breakdown. Meets or exceeds the highest gasoline engine protection requirements: JASO MA and API Service SL, SJ, SH. You can buy this oil on They carry a full line of Pennzoil products.
  8. BMW MOTORCYCLE OIL "Recommended for all BMW motorcycles after 1970 High performance synthetic provides high load-carrying characteristics, minimum foaming and exceptional resistance to thermal degradation. Exclusive chemistry reduces internal friction and enhances power output under extreme service conditions. 15W50 Engine Oil in 1 quart containers. Super Synthetic Engine Oil (SSEO) has been proven in the lab, over the road, and on the race course to provide maximum wear protection over all thermal regimes. Formulated with a unique combination of scientifically engineered poly olefin and ester based".
  9. TORCO 4-CYCLE   Has several types of oil.
  10. SPECTRO GOLDEN SCOOTER   Spectro Oils has one crankcase oil type designated specifically for motor scooter use: Scooter 4T Synthetic Blend, 4 cycle engine lubricant, SAE 10w40 in a 1 Liter Plastic Bottle.
  11. MOBIL 1 MOTORCYCLE OIL   "Mobil 1 Racing 4T 10W-40 is designed for sport bikes with four-cycle engines. Most of these bikes have multi-cylinder/multi-valve engines and use a common sump, which means the engine oil lubricates the engine, transmission and wet clutch. So unlike Mobil 1 for cars, Mobil 1 Racing 4T 10W-40 has no friction modifiers, which could lead to clutch slippage. The motorcycle oil also has more phosphorus/zinc for enhanced wear protection at high engine speeds and high loads. In addition, Mobil 1 Racing 4T 10W-40 has a high performance dispersant/detergent technology for better high-temperature performance and engine cleanliness. Mobil 1 Racing 4T 10W-40 is also offered in a different viscosity grade than Mobil 1 for passenger cars".
  12. VALVOLINE 4-STROKE MOTORCYCLE OIL   "Valvoline Motorcycle Oils contain proprietary blends of premium base oils and advanced additive technology to help you achieve peak performance from your machine. Both 20W-50 and 10W-40 available at: Auto Zone, Meijer, Murray's and Blains. Motorcycle Oil 4-Stroke 10W-40 also available at Checker, Schuck's and Kragen".