<VV> y'all/Bob Helt

[HallGrenn at aol.com]

In a message dated 6/28/2005 11:49:14 AM Eastern Daylight Time, 
BobHelt at aol.com writes:

> Apparently the multigrade oils get 
> thicker and not thinner over use.
> Regards,
> 

Bob,  Everything I have read says the multigrades can't meet the viscosity 
requirements at operating temps at the end of their life.  I know the API 
viscosity limit is there as a STANDARD for oils, but I don't know of any evidence 
that any of them get thicker or increase in viscosity as they wear.  All the 
reports relate to their not being the same viscosity as 30 weight oils (for 
10W-30) at operating temperatures at the end of their "life."

Bob Hall