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Old 10-10-2012, 09:53 PM   #75
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Join Date: Mar 2008
Location: Canberra, ACT, Australia
Posts: 4,543
My Ride: Ex 325CI owner
Originally Posted by bimmernut3 View Post
For those that don't know what HTHS is: High Temp/Low Shear
Low HTLS would give better efficiency or MPG. High HTLS gives more durability.

Mobil1 0W40 has a HTHS Viscosity, mPas @ 150C, (ASTM D4683) =3.8
Mobil1 10W40 High mileage is 3.9
Mobil1 10W30 " " " 3.5
Mobil1 10W30 (non high mileage) is 3.0
Mobil1 5W30 " " " is 3.1

The higher the number the better durability the oil has.
AND the High Mileage oil has a seal conditioner in it that the others do not.

ready for the flames....
the M1 XW30's are too thin at operating temperature.
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