LongHaul Posted May 26, 2020 Share Posted May 26, 2020 Oil Changes - Mileage or Time? Blackstone Lab says Mileage is what matters Blackstone Laboratories Podcast - 5/25/2020 3:45 to ~9 minute mark most relevant for cars Notes Oil Change best to be done on mileage basis NOT by calendar Calendar time alone does not cause oil to breakdown in the crankcase of engine - (unless open breather) - recent engines are sealed Transmission oil also does not deteriorate with time in the tranny, focus on the miles. Transmission oil breaks down as it is used Link to comment Share on other sites More sharing options...
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