Re: synthetic oils - yes or no?
Mobil 1 HM oil isn't SM rated.
Now coming to HM oils, they have improved additive packages and seal sweelers, that expland the seals. It is good if there are leaks from oil pan seals, rear seals etc.
I have used it on my other vehicle to fix a small seepage from the rear seal and it kind of reduced the seapage.
But Mobil1 HM is not any great than dino oil like Pennzoil HM (they were the first to even come out with HM oils) etc. which incidently is SM rated.
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