Quote:
Originally Posted by oldbmw
This is simply incorrect.
SG is the higest rated oil of ALL oils with 0.12% of zinc allowed. After this ALL grades of oil contain less in order not to affect the sensors for engine management systems.
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Which part do you consider incorrect OB?
The first part of my statement that says that SG is all the manual asks for (we're talking Japanese bikes), or the second part which states that the manual does not refer to motorcycle oil (again, we're talking Japanese bikes), or the third part where I state that ALL oils available today exceed SF/SG ratings.
I can assure you that all three of these statements are correct.
Check the Mobil site, for example, where it states "API ratings are backward compatible to previous generation ratings. This means that an API SM quality oil, which is the latest API rating, is recommended where API SL, SJ, SH, SG were originally required".
Yes, you are correct in stating that Zinc Phosphorus levels have been reduced in recent years, HOWEVER, this is only an issue if oil is used for extended periods (i.e oil changes every 15,000kms+) which may occur frequently in cars, but I would suggest very rarely in bikes where oil change intervals greater than 10,000kms are virtually unkown.
I honestly think it would be almost impossible to purchase any motor oil today that would not be suitable for a bike but having said that I'm confident someone here will go out of their way to find the exception to the rule. 
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Garry from Oz - powered by Burgman
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