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Originally Posted by hammersfan  I used Amsoil at the 6000KM oil change, can't really say if it has affected the shifting noise or not, too busy enjoying the improved engine and exhaust note to notice (maybe )! I think the noisy shuifting maybe a characteristic of cruisers in general but possibly a little worse in the C90. I have heard that Rotella synthetic diesel oil quitens it quite a bit but I'm not sure I want to go that road while it is under warranty. |
Why, would using the Rotella oil void the warranty? Why that and not the Amsoil?