In the couple years Ive been on this forum I think you are the first person to change a stator on a Vstar. Some bikes are known for stator issues (like '70s goldwings) and its a full engine pull to replace them.
The truth about motor oil is the generic oil they sell at walmart: 10W40, with no additives (the bottom half of the SAE logo empty) meets all the requirements for your motorcycle and warranty.
If you are going to race the bike on the track, or beat the piss out of it, then get the most expensive synthetic oil you can find.
If you are somewhere in between and want the engine to last for 200,000 miles, long after the rest of the bike is totally worn out - get something in between.
But seriously: the bike requires 20W40 with the SF (I think) rating (check your owners manual) with no mileage enhancement additives (they will make your clutch slip).
The difference between car oil and motorcycle oil, is they leave the additives OUT of the "motorcycle oil" and then charge you $2 more per quart.
Last edited by KCW; 07-03-2018 at 07:31 AM.