Take your pick Mobile 1 20w50 full Synthetic, both holes. I like Amsoil but you wont find it today.
Here`s some oil filters.
ACDelco # UPF1233
Amsoil SDF10, EA009, EA010 (1/2â€longer=more oil)
Bosch # 3311
Car Quest 85394
Champion # C138
Fram # PH4967
HD # 63806-004 or 00y?
HiFloFiltro #HF177
K&N # hp-1003, KN-177
Mighty # m4477
Napa # 1394
Mobil 1 # M1-103
Motorcraft # FL836
Penzoil # pz39
Purolator # L14476
STP # S4967
Valvoline # vo40
Wal-Mart Super Tech # ST4967
Wix # 51394
Union Sangyo[OEM Toyota Mfg]#C-170
SCOTTS PERFORMANCE BILLET OIL FILTER
2 1/2 q in swing arm
1 q in primary
4 oz in new oil filter
Make sure your o rings are in great shape play it safe replace they are cheap
Make sure that you screw in the dipstick all the way to check the hot oil. Mine doesn't read at all, even when hot, until I screw it in.
Ride motorcycle for approximately 10 minutes to ensure the oil is hot and the engine is at normal operating temperature.
Per the Buell Owners Manual:
# 1. The motorcycle must be on level ground, on the side stand, with the engine off.
# 2. See Filler Plug/Dipstick Location: XB Models. Unscrew and remove dipstick from oil tank/swing arm filler hole. Wipe dipstick clean.
# 3. Insert dipstick into oil tank filler hole, screwing dipstick in completely.