In a message dated 3/12/2008 8:46:15 PM Central Daylight Time, steven at newellboys.com writes: > You should only change oil brands in alphabetical order. So if you start > with Redline, you could change to Valvoline without problem, but not to > Castrol. > Does the same hold true for carbs? If so, I'm stuck with these Zenith's. Dave