is harley oil a must?
Been using different motorcycle oil for over 25 years...yes including HD oil and the like. The main thing to keep in mind...stay with oil made for motorcycles, air cooled or not...
Difference in bike and car oil: bikes (air cooled) sometimes run hot, also in most bikes, the engine oil also runs in the clutch and the transmission. A Harley engine, being air cooled,does run hot sometimes, but doesNOT share engine oil with the clutch or transmission (just like a car), so you need an oil that holds up to heat well, but you do not have to use Motorcycle specific oil. Mobil-1 is fine. For example ina Yamaha or Honda V-TWIN cruiser,there is only one oil tank which lubes the engine, clutch, and transmission. They must use a motorcycle specific oil. A Harleyhas three different oil tanks- engine, clutch, and transmission. You can put a motorcycle oil in all three, or do like a car, use engine oil, clutch oil, and transmission oil.Harley's "360" works fine too,in all three holes,you just wont be able to get it in Buffalos Butt, Wyoming at 7:30 at night....but you CAN probably find Mobil-1.OH....another thing, the synthetic holds up longer, you can go five or six thousand miles between changes as apposed to changing oil every 2500 miles with "360". That can be every three to five days on a long trip....not convenient.
It's a little hard to generalize about the difference between Mobil 1 passenger-car motor oils and Mobil 1 motorcycle oils. That's because not all viscosities of Mobil 1 passenger-car oils have the same levels of zinc and phosphorus, and there are even greater differences among the three Mobil 1 motorcycle oils. In general, Mobil 1 motorcycle oils have:
[ul][*]Additive packages balanced differently for motorcycle engine and transmission operation. For passenger vehicles, fuel economy and emission system protection are higher priorities.These require low phosphorus systems and the use of friction modifiers. Motorcycle oils do not require friction modifiers for fuel economy and for better clutch friction less/no friction modifier is optimum. Motorcycle oils allow the use of higher levels of antiwear additives such as ZDDP (phosphorous).
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What are the overall advantages of Mobil 1 motorcycle oils?

In addition to the overall benefits listed above â specifically, high-temperature stability and low volatility/low oil consumption â Mobil 1 synthetic motorcycle oils also offer superior anti-corrosion performance compared to conventional motor oil, which is important in many parts of the country where bikes may sit in garages for several months of the year.
Compared to conventional oils, Mobil 1 motorcycle oils provide superior wear and high-temperature protection, and promote engine cleanliness and lower oil consumption.
Once you get past these general advantages, you have to deal with each specific motorcycle oil one at a time to understand the benefits.

Motorcycle oil superiority to car oil? - a myth
Synthethic better than conventional oil? - a fact
Best of the syntheticoils?- Mobile1
Just the facts jack (and Jill)
The Best of Harley-Davidson for Lifelong Riders
I found some useful info on Mobil's website to help understand the diference between car and motorcycle oil.
It's a little hard to generalize about the difference between Mobil 1 passenger-car motor oils and Mobil 1 motorcycle oils. That's because not all viscosities of Mobil 1 passenger-car oils have the same levels of zinc and phosphorus, and there are even greater differences among the three Mobil 1 motorcycle oils. In general, Mobil 1 motorcycle oils have:
[ul][*]Additive packages balanced differently for motorcycle engine and transmission operation. For passenger vehicles, fuel economy and emission system protection are higher priorities.These require low phosphorus systems and the use of friction modifiers. Motorcycle oils do not require friction modifiers for fuel economy and for better clutch friction less/no friction modifier is optimum. Motorcycle oils allow the use of higher levels of antiwear additives such as ZDDP (phosphorous).
[/ul](Snip the rest)
Bottom line? There simply isn't enough difference in the additive packages to justify the doubling of cost.







