In a message dated 97-12-12 20:20:24 EST, cen13504@CENTURYINTER.NET writes:

<< > what about the muffler bearings?  i know that it is time to change
 > over to winter air for the tires
 > <snip>

 Kenneth Winter wrote:

 Does that need to be northern or southern winter air?  I understand that
 they compress at different rates.  I would not want to have problems at
 high altitudes. >>

i'd advise changing muffler bearings every 3000 miles or so, to ensure smooth
operation of the muffler.
as far as northern or southern air, it is recommended if you plan to take a
trip south over the holiday season, southern air in the tires would be
advised, as it improves gas mileage and cuts down on driving time, because of
the "climatic draw" phenomenon.  It is vise versa if you live in the south and
plan to take a trip north...

if anyone's interested, I'm selling bags of northern air, (fresh from Pa)
$10 each.

thanks
chris