Hummer service manager was glad when i walked in with Royal Purple engine oil and tranny fluid. Best choice You could make. I do not know about that as everyone has a preference. But, I did not chnage to royal to extend oil chnages but, increase protection with the power I'm running. I have heard going to 5000 miles with a good syn. is not a big deal I have talked to some who are not off roaders who go 10,000 miles and have reports from their ser. guys the oil stil looked good. I just go buy the normal oil change and figure it is allot cheaper than a new engine.
TAZ
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05 H2 SUV cus. paint, Magnuson SC 6/12lb boost, cowl hood scoop, 12" dash touchscreen, GM elec. fans, HPTuners.com tuning soft., Dynatech headers dual catback exhaust Jet Hot chrome front to back Flowmaster Super 40's, Diamo 8 Karat rims & 325X60-20" Toyo, 4 OEM Captain seats Katzkins leather, rear console computer inside running all AV/NAV etc., Infinity component system 3 amps Tsunami Caps, rear flip down 12" monitor, headrest monitors, overhead console boost, fuel pressure, & A/F ratio gauges
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