Wednesday, February 17th, 2010 AT 9:00 AM
On occasion the cab fills with exhaust fumes for periods of 30 seconds to 5 minutes. Can occur on open road where there is no vehicle ahead of me. Odor is so strong I must open windows. Happened only 3 times so far, with periods between episodes of months to 2 years. 2 of 3 episodes was at highway speed, 1 in city. What's up?