Well I dont answer for Fred, but at 52 weekends a year if your engine is on for 4 hours every weekend you got 205 hours in a year.
By the way, what engine do you have and how often do you change your oil?
As for synthetic oil, good old wikipedia has some good info.
http://en.wikipedia.org/wiki/Synthetic_oil
-- Edited by Marc1 on Saturday 10th of October 2009 03:04:28 AM