Join Date: Aug 2010
Location: Kansas City, KS, USA
Re: Best Oil for an LT
Castrol ACT>EVO Extra 4T 20W50 has about 1,030 PPM zinc and 1,000 PPM phosphorous. Mobil 1 15W50 has about 1,300 PPM zinc and 1,200 PPM phosphorous, and Valvoline VR-1 20W50 has about 1,400 PPM zinc and 1,300 PPM phosphorous. Mobil 1 V-Twin has 1,600 PPM zinc and 1,750 PPM phosphorous.
The 4T oils are suitable for motorcycles with wet cluthes and where the transmission shares the engine lubricant. Mobil V-Twin is also suitable for wet clutches. Zinc and phosphorous are not indicated purely for motorcycles. Heavy duty oils for diesel engines also have high levels of these compounds, as does engine lubricants for many other applications.
The K1200LT doesn't have a wet clutch and the transmission doesn't share the engine oil and therefore doesn't require 4T oil. It also doesn't have roller cam followers and reportedly may benefit from oil with elevated levels of zinc and phosphorous. Since high levels of phosphorous could prematurely poison the catalyst, a reasonable compromise seems to be an oil with levels of zinc and phosphorous in the 1,200 - 1,400 PPM range.
BMW MOA #140995
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Last edited by andres; Aug 20th, 2013 at 3:51 pm.