Worked in a power station 25 years,never saw an engineer that needed any help in being confused. The point was,if you are going to get paid to 'engineer 'a car and expect the user to use Synthitic oil,why would you ship it with,'old' oil? Yes,it has to do with conservation.If every car produced hat pure synthetic,and recommended 10,000 miles changes,sell your stock in jiffy lube.
Modern API SM grade fossil oil isn't exactly "'old' oil." It is perfecty acceptable if used within its intended parameters - that its extreme ends of its viscosity range aren't challenged, and that it not used in extended oil change intervals (10K +). Many manufacturers still specify a 7,500 mile interval (in ideal, non-severe service use), and a fossil SM can do that.
We don't know what Mitsu's intended interval is; M-B won't pass on that info.
Get your point,I usely do the 5000 mile thing,sometimes less ,sometimes more.Fact is,anyone that has a high milg. car,did it .We used synthetic oil on B 52"s back in 67/68,so it has been around a long time.Allways wondered what would happen if I put that stuff in my Ford 260 v/8,but I don't think it was multi grade .Not the same as a j57 engine.
Other than the Germans' WWII exigencies, synthetic lubricants were first used here as aviation turbine oils, partucularly because of the extreme viscosity properties. That "Buff-Hotels" are still a mainstay confirms that synthetics in their case have done their jobs.
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