I see we've come full circle (see post #5).

 

My second vehicle : a 1998 4 Runner with four wheel drive has 300,000 miles with the original AC charge, alternator, rear end, and a transmission that has NEVER been rebuilt. 15,000 mile oil changes with Mobil 1 synthetic extended performance. Nothing consumer brainwashed here. 97-99 4 runners..... They're bulletproof.

 

my bad. its some beamers. its in the bmw manuals that its recommended at 15k

 

I am sure it will be ha. It's just hard to break the habit. Also have issues when on a track, I will use my blinker to signal that I am passing someone that has given me a point by.

 

Well, Certainly you don't have to break habit if you don't feel comfortable doing so. Lol

 

I change my oil every 12572 mile no more no less.

 

Really, how strange. I change my cars oil every 12573 miles.

 

Blackstone labs and other labs will perform an oil analysis for you. Get a pump to remove the sample from the dipstick tube and mail it in. You'll get your answer within a week, faster if they have your email address. I have a Shelby so I'm more meticulous with it than I am other vehicles. It's new (3500 mi) and I'm sampling at 1500 mile intervals. I changed it for the first time at 2500 because the life left according to the onboard indicator was at 15%. Blackstone confirmed this and also confirmed that the oil had less material in it than usual first change oil (something they credited to the build quality of the engine).

It's not impossible to be sure you're getting the most out of the oil you're using. It costs less to have the analysis than to change the oil/filter. If you're unsure, send it in and have it looked at.