Could this have something to do with changes in grease technology?
There used to be bearing grease then there was disk brake bearing grease that
is now pretty much standard. It has a higher melting point to cope with the
higher hub temps that came with using disk brakes. The manuals sometimes get
stuck in old technology that gets repeated instead of updated. A case in
point, most car manufacturers recommend repacking the front wheel bearings
every 30,000 miles.
My Jeep Wrangler manuals (factory and haynes) say this despite the fact that
the front hubs are sealed units that require the bearings to be replaced if
they are taken apart. The units are good for 100,000-400,000 miles. Yet if
you take the car in for service they will mark off the "repacking" as being
done.
Just a thought, turned into a tirade.
|