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Thanks for the info guys. I'm not hung up on ester based oils, It just happened to be an ester based semi-synthetic oil that was recommended to me by someone who's been riding and fixing these bikes for a long time. He's a local dealer, very involved with the local club, donated much time and...

Originally Posted By: bepperb EXC400 Rider. I assume he's asking about his EXC 400. Right you are. A synthetic blend, ester based oil was recommended by a local dealer. Since new the bike has only been run on Amsoil full synthetic. I have been having a hard time finding it this year, and the...

What is the benefit, or characteristics of ester based oils? Specifically when used in a motorcycle. Is this just another form of marketing hype? or is there a benefit to ester based oil? And of course, what is Ester?

Originally Posted By: ccdhowell I wouldn't be so fast to put it in my KTM if I were you. All the KTM engines spec 50 or 60wt oil, they must have a reason for that. I race against several 450 and 510 XC quads and they all gripe about the cost of the oil, but continue to use it with predicably...

Thanks guys... Is there another HDEO syn out there that has better shear properties? I would really like to stick to the synthetic if I can... or is the difference not really that big.... I am changing oil every 10 hrs. What about the difference overall between dino and syn? I like the idea...

After doing some reading it looks as though the Rotella may be safe to use in my bike. (06 KTM 400EXC). I haven't seen alot about this oil written for use in offroad bikes, and am not sure if it makes a difference compared to other bikes or not. The bike has a wet clutch, and does require JASO...