No Full Synthetic Oil in the Z?

semtex

I didn't mean to imply that there's anything special about the 5500 miles mark. It's just where I made the switch. I did my first oil change at 1800 miles, putting Nissan's Ester oil back in. At 5500 miles I just figured it was close enough to 3000 miles since my last oil change, plus it was a nice even number and it was also a good time to put my oil cooler on. So that's when I switched over to synthetic. Like David said, most people recommend making the switch somewhere between 3-10k. I've always considered waiting until after the first 5k miles to be a good rule of thumb, just to be on the safe side. But it's just a personal thing. It's not like I have some scientific study pointing to 5k as the magic threshold or anything like that.

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316.8whp & 248 ft/lbs (Dyno Dynamics) | 319whp & 256 ft/lbs (DynoJet) (04/23/10)
Stillen G3 CAI, CBE, Pulley / F.I. LTH / GTSpec Ladder Brace / Setrab Oil Cooler / UpRev-tuned by Forged Perf.