I change my oil by sight.
I don't buy the "minute lube" recomendation of 3000 mile changes because of the research that shows that oil doesn't wear out, it just gets dirty.
My stang has 150K on it and a fresh oil change & filter never stays clean for long. It tends to stay somewhere in betweeen clean and black, which works for most driving conditions.
You can always spin on a new filter more frequently if you want to be on the safe side. 2000 mile oil changes are alot cheaper that sigging into the cause of dirty oil. It's a matter of dollars or some cents.
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Spec Service (UHP), BFG G-Force KDW's, Turbo Coupe 3.55 rear w/disks, 73mm calipers, Stg 1 Twisted Wedges, TFS Street Intake, 70mm TB, E cam, Crane 1.7's, Aeromotive FPR, BBK 1 5/8 shorties, elec fan, FMS Al Radiator, Moroso Wires, Kenne Bell Ramair, March pulleys, Race Magnums, 190 lph Walbro, FMS Al Dshaft, D/S loop, MM 4point rollbar, FMS C spngs, strut tower brace, Tokico Illuminas, Prothane bushings, MM Lwr Conrol Arms, KB welded subs, Cervini Mach 1 hood/valence/side skirts/wing/airdam.
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