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I do the Mobile 1 from Walmart thing for my wife's car along with RPM Delo400 and filter for the truck. I follow the 5K mile oil change schedule for the truck. Soon after I got it, I bought a bypass filter and installed it. I read that is one of the major things you can do for longivity, but what do I know. 55+ years ago when my father worked in the service station business, he always said RPM Delo was one of the best oils.
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Marv Evans
'69 911E
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