do it according to how hard you drive. if you're constantly beating the shit out of it, do it at 3500-4k if you're running synthetic (not royal purple crap). if you granny drive it, you can get away with 5-6k miles between intervals. If you're running royal purple, its a non-detergent oil which means race only. You don't wanna run royal purple for more than 3k miles at a time. I pulled apart an LS1 at 60k miles that ran nothing but royal purple. It looked worse than a motor with twice the mileage running pennzoil. Some royal purple out there does have detergents, but the majority dont. I'd suggest castrol syntec, or if you have to, mobil1. If you're willing to spend the money, buy amsoil. Its the best synthetic oil out there, has amazing detergent properties, and won't hurt anything if you happen to miss the 5-6k mile intervals. Yes its expensive, but more now, is less money spent later
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-Chris
**83 Turbo 280ZX** - Megasquirt 2 v3.0 Stand alone EMS, n42 head swap (8.3:1 cr), n42 intake, 60mm throttle body, z31 watercooled T3, NXS Manual boost controller (12psi) MSD Blaster 2 Coil, Apexi 3" Turboback Exhaust, Exedy Stage 2 Clutch, Greddy Type-S BOV, DNA Motoring FMIC, Walbro 255 Fuel Pump, CX Racing SR20 Radiator, Custom Ram Air Intake, Suspension Techniques Sway Bars, Eibach 2" Pro Lowering Springs, Tokico Blue HP Shocks, Energy Suspension LCA, Subframe, & End link Bushings
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