I thought I was over oiling them with the Traxxas filter oil, so I had gone to the vegtable oil to try...Only tried it one or 2 runs though, not a long time (funny, that's when I started having tuning problems), but both the Himoto and Traxxas owners manuals both say you can use vegtable oil...Of course the Traxxas one says to use theirs first, but if that's not available...LOL...