My daily driver goes about 20,000 - 25,000 miles using AMSOIL 0W-30 before I change it, (recommended and warranteed). I have a car that I installed the AMSOIL bypass oil filter on and that has gone about 115,000 miles with no oil change, using oil analysis as preventative maintenance. I have another car that for 13 years has%

 

5k= change time im over by 3k

 

I had a roomate in college who never changed his oil and would just add oil to his Toyota until yrs later when it blew up. He also put dish soap in the dishwasher...idiot!!

 

6k on synthetic, and that was pushing it.

 

Nice!! I'd like to see that UOA as long as it was with a VQ35DE. You should post it up here: http://www.my350z.com/forum/engine-d...ysis-info.html

 

I think im going on 5k right now it kept raining the day i was gonna change it or something else would come up hahaha, or ill forget to go to walmart to get the oil since kragen charges $6 a quart for mobil-1 5w-30

 

6000 for me , it was pitch black, i do it at 4500 to 5k

 

I get the wife's 07 Sedan oil changed ever 7500m with full synthetic... she commutes 70+ miles a day all freeway so its no biggie.