Go back and read the original question. Dragonfire2004 asked about a 350 ES, not a 250 EX. Not that it makes a whole lot of difference, but at least get your facts straight.

 

in my trx 300 4x4 i just run regular valvoline 10w-40 automobile oil. the bike seems near bulletproof and i have never had a problem. i know many say don't run the car oils but i have yet encountered any problems since i started running this oil in 1994.