It's time to change the oil in my 1999 yz400f, and I am a complete noob when it comes to anything with a 4-stroke. The owner of the bike before me ran Yamalube 4-R in it. But I have been reading great things about Shell Rotella T in other threads. Would the Shell oil be sufficent for my 400f? For some reason I am really worried that I will put in the wrong oil, which will make my clutch slip ect. And which bottle would it be? http://www.rotella.com/products/index.php Thanks.