can you use 10w40 in a trx450r
Posts: 1,963. Liked: 24 times. As long as it's made for use in atv's and motorcycles with a wet clutch system your good to go, just change it often, I looked it up for you today, and Valvoline only offer's motorcycle/atv made oil in 10w40 and 20w50,,here is a pic of the bottle also.