under the seat
The Oil Filter is located under the bike just behind the transmission.
3.4 quarts i believe
No oil in crankcase in a Harley Big Twin. All FXR's take three quarts in the oil tank.
Sunoco, makes Harley Davidson engine oil
3.5 Qts in most softails, 3 pts in cruisers like Dynas or FXR's, and 4 qts in touring bikes.
should be 20-50 wt harley oil but check with your dealer first..
24 ounces.
The drain plug is located in the frame itself, under the right side of the bike. Use a 5/8 socket
The amount will depend on the Model, the oil weight is 20W-50. I recommend Amsoils 20W-50 Synthetic Motorcycle Oil (MCV) that's all I run in the 1990 FXR Hope This Helps.
No.
Harley Davidson recommends it (Citco I think) but No!!! Just use the correct weight for your motor, time of year and how you ride it!
There is no such bike. In '92 there was an FXR Super Glide, an FXDC Dyna Glide Custom, or an FXDB Dyna Daytona. Do you mean oil drain plug? If the bike is, indeed a Dyna, there's a plug on the bottom of the oil tank which is below the transmission. If it's an FXR the drain hose for the oil tank is under the left side plastic cover.