Posted by sotxbill on January 31, 2017 at 15:18:07 from (104.5.24.112):
In Reply to: History of Mobil 1 posted by Geo-TH,In on January 31, 2017 at 05:47:44:
Yes,, there are two reasons that is MAY leak more.
First off, the high Base additives that are in ALL hd oils will act as a cleaner, and will slowly clean the sludge from the seals and surfaces. So if those seals are really worn out, hard and not longer pliable, the cleaning process will slowly expose the base seals to splashing oil, and then, the will start to leak or leak more.
Second, there was a period when seals and gaskets had a high level of silicon in them. The hd oils fully syn, partial syn, have additives that would actually leach the silicone out of the seals and they would fail. Those seals (1980s) were reconfigured so that they would not be affected by the newer hd oils.
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