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Originally posted by Dad2leia:
This is probably reverse of what you had in mind, but I use motorcycle oil in my SUV. I like the beefier additive package that this motorcycle oil has, hence why I spend the money for it.

The product is Maxima Maxum 4 Ultra 0w30.

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Originally posted by Dad2leia:
This is probably reverse of what you had in mind, but I use motorcycle oil in my SUV. I like the beefier additive package that this motorcycle oil has, hence why I spend the money for it.

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Originally posted by prtdvl:
Does anyone here think there is a real big difference, or could I use the same oil for both applications, given the weight were the same as required? Some say it is OK to use non-motorcycle specific oil in a wet-clutch motorcycle as long as it is not rated as "energy conserving".

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4. Energy Conserving: The “Energy Conserving” designation applies to oils intended for gasoline-engine cars, vans, and light trucks. Widespread use of “Energy Conserving” oils may result in an overall savings of fuel in the vehicle fleet as a whole.

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Though 4-cycle motorcycle engines may be considered more similar to automobile engines than 2-stroke motorcycle engines, they still have very different performance requirements. Historically, 4-stroke motorcycles have had problems with gear pitting wear in the transmissions and clutch slippage. In many cases, this can be directly attributed to the oil used. Most automotive engine oil is developed to minimize friction and maximize fuel economy. Since the oil for many 4-stroke motorcycles is circulated not only through the engine [as with an automobile], but also through the transmission and clutch, different characteristics are required of the oil. First, a certain amount of friction is necessary to prevent clutch slippage. Second, the oil needs to prevent wear and pitting in the gears of the transmission. These and other essential characteristics are addressed in the standards developed by JASO for 4-stroke engines.

As with the 2-stroke classification, the JASO 4-stroke classification is also divided into grades, MA and MB. MB is lower friction oil, while MA is relatively higher friction oil. Other than friction, the JASO 4-stroke classification tests for five other physicochemical properties: sulfated ash, evaporative loss, foaming tendency, shear stability, and high temperature high shear viscosity (HTHS). Sulfated ash can cause pre-ignition if the oil is present in the combustion chamber. It can also contribute to deposits above the piston rings and subsequent valve leakage. Evaporative loss and foaming reduce the amount of lubrication and protection in the transmission, engine, and clutch. With less shear stability, oil loses its capability of retaining original viscosity resulting in increased metal-to-metal contact and wear. High temperature high shear viscosity tests provide viscosity characteristics and data under severe temperature and shear environments.

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FRICTION MODIFIER
Definition: Additives that reduce the friction of moving engine parts or oil flow in the engine.