4.2L V6 - M5OD | SCT XCal 3 @ JawsRacing | K&N Series-77 | 16" Dual Efans | Magnaflow High-Flows
50W 5000K FX-R Projectors | Philips LumiLED Taillights | 60" Plasmaglow Fire & Ice | 2" Drop Shackles
My dealer in the Kansas City area says every 5K. I drive a lot of highway miles so that works for me. It depends on your motor, driving conditions and what you think is right.
Oil is cheap. I change it every 3,000 miles.
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I switched to full synthetic like my Bimmer. It says on the BMW 1500, but I do at 7ish. I'll do the same for my truck.