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Originally Posted by Dez
Newb question.... I've seen the oil recommendation at 10w-40. Is the heavier weighted oil better?
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You are in a warmer climate so the 15-40 might be a better choice overall. Both the Vstrom and M-50 ran and shifted beautifully with Rotella. The GZ(and my Vstrom) when Lynda still had it was running Amsoil 10-40 but it just became too expensive. Switched the Vstrom over to Rotella at the same time as the "M" received it's first oil change.
The one thing I did notice was there was very little if any oil usage with Rotella in either bike. The oil change intervals remained the same as recommended. Even my 4.0 Ranger 4x4 runs Rotella in the engine but the rest of the power train is all Amsoil.
I firmly believe Amsoil is an excellent product but is too expensive in many cases. The fact that the rest of the power train in the Ranger is changed at very long intervals makes it worthwhile to use. It also does increase gas mileage somewhat. On my first Ranger(1996 2 wheel drive) I did a complete switch to Amsoil(including engine) at 50,000 kms(31,000 miles) and gained an honest 4 MPG overall. That was a great surprise to me as I had calculated a 0.5 increase in mileage to justify the added cost.
I'm straying off topic a bit now. Back to Rotella. It works well and is cost effective. Doesn't seem to break down over the required service interval either.