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Adding conventional oil to Brad Penn?
I have always wondered if there is any harm in adding a quart of conventional oil, non-Brad Penn, but same weight as BP (20W50), if you typically always use Brad Penn?
So if one was on a long trip, didn't have BP to add, but wanted to add a little oil to the case, would you add conventional 20W50? Or is that a bad idea?
Curious....
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