Originally Posted by photomd
Autozone in my area now has Castrol 20w50 for bikes
...$4.99/quart. It's SG, availible locally and 1/2 the price of BMW oil. It's about 2/3 what I can find Spectro.
Keep an eye out for their sales. I got 2 cases of Castrol 20-50 Motorcycle oil in the spring from Autozone for $1.99 a quart.