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Most Harley engines (including yours) are fairly low-tech and don't share their oil sump with the gearbox like metrics, so the main concern is using something that can hold up to the heat in an air-cooled engine fairly well. Any good synthetic on the market will fill the bill and provide more than adequate lubrication. Marketing hype and company-sponsored "tests" aside you'd be hard-pressed to find any brand that outperforms the others enough to matter.
$13 a quart Amsoil, $10 a quart Syn 3, or $4 a quart Mobil 1 15W-50 from Walmart- take your pick. They all work great...
This would be a good comination if you are concerned about heat.... Engine (3 quarts) and Primary (1 quart) Oil: Mobil 1 for V-Twins 20/50 Transmission oil (1 quart): Mobil 1 75/90
Next time, consider the following: Walmart carries 75-90 and 75-140 full synthetic under their house brand, Super Tech,
in the identical container that Mobil 1 comes in at one-half the price.
Somebody once wrote; We all agree that some oil is better than no oil, clean oil is better than dirty oil, everything else having to do with oil in a Harleywill get very controversial.
I usefulll syn Mobil 1 15w 50 in the crank, full syn 75-90 in the transmission anddino Valoline 20w50oil for 4 stroke motorcycles in theprimary. That's my story and I'm sticken to it.
If you stay within the confines of the mainstreamarguments, you will be safe with your decision. Good Luck.
I run amsoil just because I use it in all other vehicles. Cheaper than h/d oil. As I used to tell my customers though, any good quality oil with regular change intervals will give good protection. I suggest synthetic for air cooled, holds up to heat much better, but if you use conventional, change more frequently. I have seen very high mileage out of extended oil change amsoil engines in comparison to same engines on conventional oil that required repair. jmho.
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