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.

__________________
"There are no small accidents on this circuit." -- Ayrton Senna
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.

kannibul

I changed mine out at 1200 from whatever the factory put in to Mobil1 and the larger version of the OEM oil filter (it's slightly longer, same diameter) - I'll change it out again in spring, when I do all my vehicles annually.

I'll put in the regular Mobil1 oil again for next year, and change it out in the fall or when I hit around 3K more than whatever it is in spring, then after that I'll probably move to the 7500mile-rated Mobil1 oil and change it annually.

My Civic, I think, came with Mobil1 factory-filled. I changed it out at 5K a couple times, then moved to Mobil1 15K oil. Next interval is at 75K. I'll probably be a bit late, and just change it in March, since it's at 70K now. I checked the oil, and it's fine. Engine holds 3 quarts...so if it's a quart low - that's really bad!