Below are the results of my first time Blackstone Oil Analysis. My stock S4 has almost 60k on it, and I've been using Mobil1 0W-40 for about 20K miles now.



First a little background:

If you haven't already, check out O.W. Kenobi's post on from his Blackstone Oil Analysis in the summer of 2004 ("In case anyone's wondering how long Mobil 1 0W-40 lasts...") in which he points out that a good oil like Mobil1 0W-40 can last several thousand miles in our engines.

In the past, I wasn't uncomfortable going more than 4K or 5K between oil changes, but these sorts of tests are quickly changing my mind. It costs $20 to do the test ($30 with the TBN analysis), and if I can potentially double my mileage between tests, I'll easily come out ahead (cost of test vs cost of oil + filter + time or labor).

Next, some comments on my results:

I'm still learning how to read everything, but I requested the additional TBN test (+$10) because it helps to determine when additives are still left in the oil and if the interval between changes can be extended. Notes about my results:

--This is my daily driver, and I get stuck in traffic here in Atlanta A LOT (probably the reason for the Fuel @ 0.5%)
--No track time, no mods; I'm pretty easy on the car and oil temps don't get much above 215F (ambient today was 65F on the way home)
--Yes, the make-up is wrong (I actually added nothing). :)

Blackstone recommends I extend my use to 5,500. My TBN was 5.3, but I didn't submit any "virgin" oil to get a base reading. I guess I'll save that for another sample analysis. Once I post to BITOG, I'll probably learn a bit more, like what the viscosity signifies.

Finally, some additional reading:

--Blackstone Homepage
--Guide to Reading Test Results
--TBN Info & Explanation
--O.W. Kenobi's original analysis (AW)
--BOBISTHEOILGUY.com is a good discussion forum on oil analysis (aka BITOG)
--FixedWing's Mobil One 0W-40, 2000 Audi S4 Analysis (BITOG)
--PaJohn's M1 0W40 vs Amsoil 0W30 on my Audi S4 Analysis (BITOG)
--funkadelic's '01 Audi S4: Redline 5W-30 vs Mobil 1 0W-40 test results (BITOG)
--Goldmbr_DutchDaddy's AMSOIL report @ 7,900 (AW)

Edit: Changed subject because it was confusing.

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