I could be for your oil pressure switch (for the idiot light), or an oil pressure gauge.
on the bottom of the oil tank under the right hand cover
The "recommended" vicosity oil is 20w50, but check with a shop other viscosity oil may be used.
4 Quarts with filter.
10w40
10w30
as far as i know hd never produced an 83 flhs..odd i kinow, since my vin says i have an 83 flhs 80...help!!
what kind of engine?
10w30
75w90 gear oil75w90 gear oil
10w30
Should be regular 2 stroke oil