Quote:
Originally Posted by Assimilator1
I've only just noticed that the 15w-50 has the same zinc level as the 10w-60, any idea if the 15w-50 is used by any manufacturers for road cars? That said, your snippet there shows road going Porsche's up to '98, which have cats, so the zinc level should be ok? Oh and where did you find the Mobil 10w-60 zinc info?
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I don't think the M1 15W50 is a factory fill for any OEM, because the Mobil-1 product guide attached above doesn't show any OEM approvals. Yep, some of the prior to '98 road going Porsches had catalytic converters. Additionally, the M1 15W50 has been on the market for a long time. All of which seems to indicate a 1300ppm Zn level is okay. I found the information in the screenshot at this link below.
https://www.jmgshop.com/engine-oil--...urbo-102-c.asp