Uncategorized 400ex oil May 22, 2016 Matt400ex00 Should I use 10-40 or 20-50. I have an aftermarket cam and some people say run 20-50 with those. I’m in New England so it is 80 degrees domedays and 65 the next day. Also I want to use conventional, and any brands that are good? Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window) Related