So far, though, it appears that engine wear and presence of contaminants, as shown by UOAs, are significantly "better" with Rotella T in my car's engine than they were with any other oil I used, and especially Castrol Syntec 5W-40.
I have been using Mobil 1 Truck and Suv, and I picked up a few mpg's which is what I recommend.
I was running Motul 8100 and got tired of having to pay alot of money and get it shipped, so I did alot of research and found that overall, the Rotella is one of the best oils for the price, so I switched to that. I notice no difference in power, and it costs alot less
And I use a 15W40 diesel oil year round here in the Bay Area, currently Rotella-T, but have used Mobil Delvac 1300, Delo and others.
I use Mobil 1 Turbo Diesel Truck 5w-40. A 5w-40 full synthetic is going to work brilliantly in your climate.
i always used 15w40. usually shell rotella in all my old diesels. sometimes i used castrol. but it was always 15w40
Have also used M1 TDT 5w40 and have had great success
I was using 1 quart every 1000 miles on my o6 2.0t GTI, I actual changed to 5w40 Mobil Turbo Diesel and have gone down to about 1 quart in about 2200 miles also check you pcv as they are notorious for going bad.
IMO M1 0w40 is a very good oil that may do well in many cars. It is a master at being built to meet manufacturers specs.
I used Mobil 0w40 in mine all the time
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