If your reffering to the motor oil (oil tank oil) then depending on your local climate, you would either run 10W-40, or 20W-50..
during the fall, or spring, when it`s say, less then 60F, you would probley want to run 10W-40....when it starts averaging 70F+, switch the the 20W-50..
this would be considering your working with a fairly tight motor..if it`s a high mileage motor, go ahead and run 20W-50 even in the fall and spring, and you may want to consider going to a striaght 50, or 60 during hot summer months..
Rev tech is very good oil, but something a little cheaper, which is what I usually run, is castrol GTX 20W-50...
the transmission, uses "primary" oil, as it shares the oil with the primary, which includes the clutches..so be sure to get actuall "primary" oil for the tranny/primary..other wise, you run the risk of slipping clutches...
hopes this helps..and for what its worth..i literally make a living out of working on bikes out of my home garage...
ride safe..
what type of oil for a 1993 Harley Sportster 883
How do you change oil on a 2001 sportster 1200
Under the motor
engine and primary share the same oil on the 1976 sportster,due to engine oil sumps into primary.
amsoil 10w 30 the best money can buy
20w50 motorcycle oil
20/50 SYNTHETIC OR REGULAR MOTOR OIL............ CHUCK MC
on bottom of trans. case. kind of hard to reach
HD makes a weight of oil they call "Sport-Trans" that is made for use in the Sportster primary. Or, you can use any 30W non-detergent oil.
Formula+ or Syn3
just behind the starter motor on a 1994 harley Davidson sportster is what looks like some sort of oil-outlet hose does anyone know where this hose is connected to
SAE 20W-50 Synthetic Motorcycle Oil