quote:

Originally posted by Buster:
http://theoildrop.server101.com/cgi/ultimatebb.cgi?ubb=get_topic;f=1;t=012604

What are your thoughts on M1 0w-40? The oil has shown to shear down to a high 30wt oil many times. While it would thicken back up over time do to oxidation, some don't like it bc it does shear. Wear metals are so so and usually your 5w-40's show better results.

IMO, this oil tries to be a one size fits all and with that makes some compromises. It's now SM rated. Your 5w-40's are usually loaded with more ZDDP also. Someone mentioned cleaning ability and that is why it shows higher wear metals. I don't buy that being other ester based oils like D1/M1 SUV show better results. Thoughts?

Oh and the argument that it comes factory fill in high end cars is a good point, but most of those cars hold 9 qts of oil so I'm not really impressed by that fact.

I have heard that Mobil 0W-40 was very prone to shearing too! I have used it in my Volvos in the past, and never really experienced any issues, however, I hear that this oil is weak when it comes to Saab Turbos. I did some research on Rotella 5W-40 and I found some very interesting information, I have used Chevron delo 15w-40 and even this oil is superb, but the prep stats and info on shell rotella 5w-40 was very informative. Rotella full synthetic

If you google "rotella full synthetic 5w-40, look for the link that is connected to www.mercedesshop.com It talks about how Rotella T Synthetic is made with Shell's XHVI base oil, which unlike other group 3 base oils does not begin with distilled crude oil, hence of all group 3 base oils, XHVI is truly the only one that can legitimately be called synthetic. XHVI is a wax isomerate, meaning that it is made from the slack wax removed from distilled crude in normal solvent dewaxing. This slack wax is catalytically transformed (isomerized) and hydrofinished into a chemically pure base oil which rivals PAO in virtually every catagory. There are other "synthetic" oils out there based on group 3, but Shell's is unique in that it uses XHVI base oil. (And I beleive Castrol uses Shell's XHVI too.) Cheveron and Petro-Canada produce group 3 base oils that come close to XHVI, but even though these oils are all hydroprocessed and utilized the same type of isomerization technology employed in the making of XHVI, they are not the same thing. Only XHVI is made from pure petroleum slack wax and its CAS number is 92026-09-4. The CAS number for the more typical all-hydroprocessed group 3 base oils is 64742-54-7. If you want to know your synthetic oil is made from, take a look at the MSDS and look for these numbers. (The CAS number for PAO is 68037-01-4.) Interesting isn't it! Feedback please!


Best Regards