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RE: Vis of 30 vs. 50 Mobil 1



Prakash,
 
It's great when someone provides the kind of data you posted on the oil 
viscosity.
 
Having read it, though, I wonder why the Mobil 1 10W-30 is labeled as a 
30-weight when its actual vis places it in the _high_ end of the 40-weight 
range.  It seems misleading to label a product this way.  Of course, I don't 
know what the oil vis was when it was new, and I _suppose_ it could have been 
a 30-weight, but I'd expect it would have been more viscous when new, not 
less.  It seems like it could easily have been in lower end of the 50-weight 
range.  If I am buying a 30-weight, I want it to _be_ a 30, not a 40 or 50!
 
The other item that is confusing is that the Mobil 1 10W-30 is, I recall, 
labelled as an "Energy Conserving II" oil, whereas the 15W-50 is not.  This 
implies that the vis of these two grades are _in fact_ more different from 
one another than your measurements suggest.  Does this mean the 15W-50 is 
mislabeled (by omission) as a non-energy-conserving oil?
 
I suppose the other possibilities are that the vis measurement on the 10W-30 
was done incorrectly, or that the sample was somehow contaminated.  Do you 
have more than one measurement for the 10W-30 grade, i.e. from other, separate 
oil changes, that confirm the high-vis number for that oil?  TIA.
 
 Regards,
 Jerry
 Arlington, TX (19-Sep-96, 06:19)
 '95 540i-6 spd