My owners manuel on my '88 K100RS says use 20W-50.
Originally Posted by FredRydr
(This reminds me, I need to change my oil!)
How about this one: 15 W 40 oil designed , I am told, for diesel engines. The proof: 1976/6 with 142,000 miles, 1978/7 with 48,000, 1987 Volvo DL with 325.000 miles (does not use a drop). All bikes get oil change 1500-2000 and car gets oil change @2500. Volvo purchased new; bikes had milage in mid teens when purchased.
>Well not exactly. My '78 R100RS used a quart of oil every 1K miles from the day one.
Well maybe that's the reason not to use low viscosity oil.
FWIW, I follow the recomendations in the manual and other than a small leak that was fixed by a re-torque of the case halves on my Triumph, I doubt I've ever put more than 10CCs of oil in a bike between oil changes in my life. And I change at the 3K or 5K recommended for the particular bike. (Mobil1 15W-50)