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Old 01-11-2004, 02:47 PM
Posts: n/a
But I just want some opinions about a specific product, not opinions about other products... yea I can dream, can't I?
Won't help you with opinions but I will help with some facts.

Mobil 1 15W-50 has the same cold pumping viscosity of Rotella T 15W-40 (7000 centipoise at -20C), which is not very good. Pour points have very little real world value(statement from Mobil). The cold cranking simulator is directly related to your engines function of pumping the oil and is a much better guage for cold weather characteristics. Below is a list of a few CCS specs for your inspection. Delvac 1300 has the best CCS spec of all the conventional diesel engine lubes. And Mobil 1 0W-40 has the best for the syn. group.

Mobil 1 0W-40-----------6200cp@-35C
Rotella Syn. 5W-40------6400cp@-30C
Delvac 1 5W-40---------6600cp@-30C
Delvac 1300 15W-40----6000cp@-20C
Delo 400 15W-40--------6400cp@-20C
Pennz L.L. 15W-40------6400cp@-20C
Valv P.B 15W-40--------6600cp@-20C

The lower the cp# the less resistance to pumping. Notice the different testing temperatures.

Mobil 15W-50 is not a very good cold weather oil. You can get better. It is also not the best for your diesel, carrying the old API CF rating. Mobil 1 0W-40 also carries the old CF rating.
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