Took my motorcycle into the dealership for an oil change. Manual calls for 10w40 but the dealership put in 10w30. Should I worry about this at all? Also, I plan on a switching to a heavy duty oil on my next change. Since I can't find a 10w40 heavy duty oil, I would going to use Rotella 15w40. Is the 5 weigh difference anything to be concerned with?
Please remember that if the MFG calls for a XXW-40 oil that you should be using that weight in an application such as a dirt bike. Not knowing what kind of bike (street or dirt)and conditions you ride in (Climate, Dirt, High elevations etc) its hard for me to pin down anything with real substanence.
Just so you know the MCF Amsoil 10W-40 is specially formulated for wet clutch applications and the high temps and revs we put on out dirt bikes. It also carries a viscosity of a 60 weight oil. Its 100% full synthetic and I race what I sell. My son races KTM 200's I race a YZ450F that is the oil we use in both bikes. Both of us have won multiple class championships in the last 3 year running this oil. My son also uses the Dominator 2 stroke oil with great success.
Now I sound like a commercial
..................sorry. Bikes are my passion and racing them 30-40 weekends a year you get to know what works and what doesn't.
So I can't question the decision by the dealer to put 10W-30 in it without a little more information.