Have been using Mobil 15W50 for years in both 123 & 124 cars.
However i noticed last time i was at Wally's that the red 5qt. 15W50
no longer carrys a "C" rating, only an "SM".
While Wally has the Diesel M1 5W40 for a few bucks more per jug it
only has 4 qt.s not 5 as does the red 15W50, making it significantly
more per quart.
Can one run M1 with only an "SM" rating with out harming an 602
engine? What about its soot suspension and other Diesel required
properties?
Thanks,
Danny, a long time lurker
According to Curt's oil analyses, provided by Larry T, the new M1
15w-50 is still ok, even though they dropped the C rating.
Curt, If I am wrong, please correct and expand.
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