Let me make a few points here:Just so that all variants of the scenario are presented, there is this:
“U.S. Vehicles Model Year 1997 and Earlier Engine Oils.”
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Also note that the viscosity chart below – published by MB in “Factory Approved Service Products August 2007” – supersedes ALL previously published viscosity charts; again, according to published documents available from Mercedes-Benz. Select the appropriate oil viscosity based on the lowest air temperature expected before your next oil change.
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Reference: Mercedes-Benz Approved Engine Oils « AMG Market | AMG Mercedes-Benz Enthusiasts
- MB's "supercession" of all previous charts with current charts is just a formality, given that they basically have no choice. MB can't go back and mandate that motor oil manufacturers re-create the "old" 1980s and 1990s SF and SG-class motor oil spec in their mainstream, commercially available oils. If they did, auto parts stores would require half of the store's shelf space for stocking all of these old motor oil specs for older car owners. Nope ... ain't gonna happen.
- I can tell you VERY definitively, that if you use a "modern" SJ- or SL-class motor oil in an M117, an M103, an M110, or other earlier engine, you ARE GOING TO HAVE VALVETRAIN WEAR and PROBLEMS that will lead to EXPENSIVE DAMAGE TO THE ENGINE. You don't believe me? Just look at the cam lobe damage to my M117 here, because I used "modern" oils (and, FYI, changed them every 2,000 miles with filter). This problem with valvetrain wear is because the additive package of recent motor oils has EVOLVED and does not include the necessary levels of friction protection that earlier oils' SAE/API classifications had.
- Older MB engines were designed and manufactured with different internal tolerances than more recent engines. This is because of the advent of more refined and computer-controlled manufacturing and measuring processes, and much smaller internal tolerances in modern engines. Modern engines are designed for optimum efficiency and mileage through less friction -- thicker oils create more resistence and friction. Also, there are ancillary things like emissions systems in modern engines that require different additive packages than older engines' emission systems, necessitating "evolved" motor oils. Older MB engines were deisgned for higher viscosity oils.
- Remember that the viscosity measurements have never changed over the years. A 10W-40 motor oil from the 1980s is the same as a 10W-40 motor oil from 2020.
- Thus, it is a FALLACY that current motor oils (both viscosity and grades) are just automatically, 100% applicable and retrofittable/usable to any MB engine ever made. Absolutely not true.
- The M119 and M104 are more compatible with modern oils than older engines, because they don't have a valvetrain design that has the levels of friction as found in the M117 and earlier engines that used a cam-follower-type system. So while 0W and 5W oils of modern spec are certainly usable in them, I still would recommend motor oil with an additive package that is more like what was avaialble when these engines were being produced. RedLine oils are excellent for this.






And now, off for a morning drive!!!





