2012 Mazda5 (2.5L), Liqui Moly Special Tec AA 0W-20, 6010 mi

[d00df00d]

122,570 total miles on the vehicle. This is the 2.5L MZR L5-VE engine – slightly bigger than in previous Mazda5s and Mazda3s.

This is not the same 2012 Mazda5 as the one from the previous Mazda5 UOA I posted, but it's identical in spec and fuel used. Slightly more conservative driving style, pretty much identical driving patterns (times and places) – except for point #3 below.

Both iron and PQ index both look significantly higher in this sample vs. in the one from the other Mazada5 I posted (16 iron / 20 PQ vs. 10 iron / 12 PQ). I'm hoping that's due to some combination of the following:

1. This sample was taken 500 miles after a valve cover gasket change (dealership) and 1-2 minutes of runtime after a spark plug change (DIY);
2. This OCI was longer (6k vs 5.1k miles);
3. This OCI included a ~1200 mi road trip with 5 human occupants, suitcases, and a fully loaded roof box; and
4. This vehicle started the OCI with some mild rough-running (apparently due to lots of short trips and some cheap fuel) and a leaky air filter housing, whereas the other vehicle had been running like a champ for over 10k miles by the beginning of its sample OCI.

Still.... I'm concerned about this one. I guess the numbers are still low overall, though. Comments welcome.

Might be able to post another sample in the coming months. We'll see.


Wear Metals

Iron - 16
Chromium - 0
Nickel - 0
Aluminum - 2
Copper - 1
Lead - 1
Tin - 1
Cadmium - 0
Silver - 0
Vanadium - 0

Particle Quantifier (PQ) Index - 20


Contaminant Metals

Silicon - 10
Sodium - 5
Potassium - 1


Multi-Source Metals

Titanium - 0
Molybdenum - 77
Antimony - 1
Manganese - 1
Lithium - 0
Boron - 86


Additive Metals

Magnesium - 537
Calcium - 1266
Barium - 0
Phosphorus - 709
Zinc - 817


Other Contaminants

Fuel Dilution - 1.4% (GC)
Soot - Water -

Fluid Properties

Viscosity @ 100º C - 8.0 cSt
TBN - 3.50
Oxidation - 10
Nitration - 10

 

[twX]

I wouldn't be worried about the iron. The ratio of PQ index to iron suggests that it's normal wear.

Here's a Blackstone UOA for this engine.
The universal averages for iron, tin, and lead are 14, 0, 1. Yours are just a bit higher at 16, 1, 1.

The leaky air box and the cold winter weather would not have been helping with wear, yet the wear rates seem to be pretty average. I'd call that a win.

 

[fantastic]

Si low
It looks like a good result. Not certain what numbers these engines are usually seen with.