Instructions
SOURCE: oil weight for primary and transmission on 2003 Road King
You could get away with it for awhile, but I would only use oil formulated for the primary chain case, and for that part of the machine, I stick with Harley brand, dont forget , u got clutch plates in there u dont want slipping. For the tranny you wanna use a good grade gear oil (75W-90, 75W-110,75W-140, SAE 190 & SAE 250) .... it'll better handle the torque requirements. I use Redline Gear Oil and shifting has improved noticeably
SOURCE: Primary oil 03' Sportster 1200 Custom
Use 1 quart of 75-90 gear oil. I use Mobile 1 full synthetic.
SOURCE: looking for best synthetic replacements
Its all a matter of opinion. Best to my Knowledge is Mobil 1 V-twin formula 20W50 Full Synthetic. Holds up better then even Syn 3 Harley Oil. But if thats not available then Stick with Harleys Syn 3
The Drain plug is at the bottom back of the Primary. After Drianing the old oil remove the bonnet cover and add one OT of Oil.
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