If you are running 20w-50w, you should have zero problems with that
little bit of Marvel in your oil.

I have been running a full quart of the stuff in my oil for 3 years,
full time, with nada  problemo's.

Might just be a coincedence, but something else may be going Kaput.

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Terry--
74 Campmobile- (Clementine)
85 GL- (Delilah)
86 BMW 325 ES- (Eva)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~     "In life, it is much better to want
something you cannot have---

Than to have something you can't get rid of"

(T.K.)