Oil for R90/6

[Dave_Hemenway]

Folks,

I did a search on the forum to find the best oil for a R90/6 and found the recommendation to buy Spectro motorcycle oil. I bought some Spectro Golden 4 Motorcycle Semi-Synthetic Engine Lubricant 20w50 rated A.P.I SL. Did I get the right oil? I am confused because the label says it is for "modern" motorcycles and I am not sure if my R90/6 is considered a "modern" bike.

Thanks for your input on this!

Dave

[20774]

IMO, no you bought the wrong oil. The SL rating is no correct for the bike. Did you read this recent thread?

http://www.bmwmoa.org/forum/showthread.php?t=52023

Depending on your perspective, you're bike is not modern. It was built in the mid '70s and needs oil that was formulated for that era.

[Dave_Hemenway]

I did read this thread and thought I was buying the right oil. The author recommended "Golden Spectro 4 in 20W50...can also have SOMEwhat extended drain intervals, as it is a part-synthetic and I have considerable experience with using this oil. This oil is a bit expensive, but is of excellent quality. This oil also has an excellent base stock. It is my favorite Airhead engine oil." What I got was Spectro Golden 4 Motorcycle oil with an API rating of SL. Is this comparable to the API rating of SG? I have read conflicting reports about this.

[20774]

Dave -

I guess I didn't read closely enough...actually Snowbum says that Golden Spectro 4 is probably one of the best oils, in his opinion. Turns out you quoted Snowbum!

I think what Snowbum likes about the GS4 is that is is part synthetic with all of its good qualities and apparently has a good amount of ZDDP...not all synthetics do. He seems to not be a big fan of full synthetics.

I should have paid more attention...I'm a mineral based oil person, so I don't follow the semi-synth thing. But Bob seems to have a good bit of experience on this.