2007 WRX Mobil Diesel 5w40 UOAs

[Ringe]

Two UOAs for this oil:

 

[Ringe]

Note, for these two I was still Stage 1 (custom tune, stock intake), but the last 1000 or so miles on the second one was in fact Stage 2 with an aftermarket intake. I'm curious as to fuel dilution in future analysis. The current oil is the same Mobil 1 Diesel 5w-40; after that I'm trying a Motul 5w-40, and then T6 after two runs of that. After that maybe one or two more with the 0w-40, and if that's still showing an amazingly high TBN after 6-8k miles, I think I'll settle with that.

 

[Ringe]

Not sure about the long-term high Copper readings. Otherwise this seems like a solid lubricant.

 

[bluesubie]

Hmm, the phosphorus and zinc levels are similar to M1 0W-40 and I thought they would be a bit higher. The viscosity is similar, although you put an additional 2k on this oil.

Did you get a custom tune when you went Stage II? You should have just posted all of the reports together. It makes my head hurt from thinking trying to compare the different reports.

-Dennis