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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