Uoa?

[erhayes]

Has anyone had a "used oil analysis" done yet. If so; what oil, number of miles on vehicle and number of miles on the oil and of course the actual data. I usually had Blackstone labs do it for me. Thanks Ed

 

[Rick's CX-7]

2007 Mazda CX-7, 2.3L Turbo
Oil: Havoline dino 5W-30
Air Filter: Original Mazda
Oil filter: Mazda replacement
Miles on the oil: 1,770 (2 months)
Miles on vehicle: 2280

ALUMINUM 3
CHROMIUM 1
IRON 17
COPPER 107
LEAD 0
TIN 2
MOLYBDENUM 374
NICKEL 0
MANGANESE 2
SILVER 0
TITANIUM 0
POTASSIUM 0
BORON 49
SILICON 15
SODIUM 0
CALCIUM 1618
MAGNESIUM 41
PHOSPHORUS 758
ZINC 903
BARIUM 2

Viscosity: 55.1
Flash Point: 360
Fuel: TR TR means trace...not unusual on new engines
Antifreeze: 0
Water: 0
Insoluble: 0.3

Blackstone comments: RICARDO: The high wear metals and silicon are not unusual finds in the oil from your new Mazda. The
wear is high due to break-in of new parts, while silicon is from sealers and sand-casted parts. The trace
of gas and mildly low viscosity didn't hurt anything. Universal averages show typical wear metals for oil
from this engine after 5100 miles use. We expect your engine will look that good or better in two or three
more oil changes. The Mazda 2.3L 4-cylinder ends to wear very nicely, and yours will too once it's past
wear-in. Check back to see improvements.


My commute is very easy on the car. I've moved from San Antonio, TX to Waynesville, MO. Traffic jams are a thing of the past. I do floor it and have floor it quite a bit. I should also mention I dumped the factory oil at 210 miles and re-filled with this batch. Current mileage is 3700 miles.


I just sent a sample of Motorcraft 5W-20. I should have it back in a couple of days. Enjoy and let me know if you need an explanation of what it means!

 

[erhayes]

Looks very good to me with such low mileage on the engine. We must compare UOAs when I get enough miles as I'm now at 127. Ed

 

[erhayes]

My CX7 manual recomends 5W30 if I'm not mistaken.

 

[Rick's CX-7]

Second oil report

Here is the second report. Notice the Motorcraft 5W-20, which is a grade below the recomended 5W-30, held up extremely well, even after being diluted cosiderably by excessive fuel in the oil. Engine wear is the same even after more than twice the miles. The only thing I didn't like was the lead; which isn't high at all, but high compared to their averages, which is "0".
I will not panic about their comments on the insolubles as this interval was the "rinse" phase of an engine cleaning cycle from a product called Auto RX. One thing is certain, this engine is running way rich, likely as someone here stated, due to the direct injection system.
Also, I'm glad to see silicone (dirt) at this low level. I just recently chaged the air filter, and the air box was very dusty inside. It seems no major damage was done from dirt ingestion. I also removed the air deflector inside the air box and the baffle from the bottom of the box, opening up another entry point for the airflow. I hope that alleviates some of the fuel richness, increases power (which I think it may have) and gives me better mileage!

Bottom line is, engine is doing "ok" and Motorcraft 5W-20 is a great oil, even in this turboed SUV!

Anyway, enjoy!

 

[1Sleepy93]

These motors have a super rich tune from the factory so I'm not too surprised to see that much fuel in the oil.

 

[erhayes]

These motors have a super rich tune from the factory so I'm not too surprised to see that much fuel in the oil.

Do we have any data that supports the idea that the fuel ratio is not stoichiometric at steady state power? Ed

 

[1Sleepy93]

Not sure about steady state but we've had a few people with dyno runs showing as low as 10:1 and I think there was one that even dipped to 9.x at WOT. That alone will dump enough fuel into the oil over time.

 

[erhayes]

WOW 9 or 10:1 is way rich. I did expect as low as 12:1 under heavy throttle. Point me in the direction of the dyno run please as I would like to look at the results. Thanks Ed

 

[1Sleepy93]

Can't find the CX-7 ones at the moment but you can check the Speed6 and Speed3 dyno graphs and most of them go to 10:1 at around 4500rpm.

http://www.msprotege.com/forum/forumdisplay.php?f=198

 

[lisevolution]

for a turbo vehicle like this sitting at a nice fat 11:1 would be great, lean enough to show significant improvement, but not too lean to cause detonation...just give it some time, there'll be someone who designs something to modify the air/fuel curve

 

[erhayes]

Thanks 1Sleepy. I really didn't see the F/A ratio for any stock CX7 engines. I expect that a WOT run will exhibit a rich F/A mixture but, not for the partial power used in our daily drives. When we see excess fuel in the oil it's probable from much town stop & go driving. I can't remember what the "ideal" stoichiometric ratio is but, seem to remember ~ 13.7:1? which is what I would hope most engines are tuned for when driven in a normal manor i.e. not WOT or High rpms. JMTs Ed

 

[Rick's CX-7]

Stoich is 14.7:1 ratio at steady state highway driving. Turboed, supercharged and nitroused cars need to run rich at WOT to prevent detonation.....9.x is definitely too much fuel. It should be high 10 to low 11s.
I think a major cause of the fuel in the oil is the direct injection system, which is dumping fuel directly into the cylinder. It's likely washing the oil film past the rings. Better tuning should net more power and better wear numbers.

Rick

 

[Rick's CX-7]

It seems the link crapped out. Here is the numbers!

Oil-------Havoline dino 5W-30, Motorcraft 5W-20 blend
Aluminum-----3----3
Chromium-----1----1
Iron---------17----18
Copper------107----72
Lead---------0----2
Tin-----------2----0
Molybdenum-374----44
Nickel--------0----0
Manganese---2----0
Silver--------0----0
Titanium-----0----0
Potassium---0----1
Boron-------49----105
Silicon------15----5
Sodium------0----3
Calcium----1618----1852
Magnesium--41----8
Phosphorus--758----622
Zinc---------903----768
Barium-------2----7

Blackstone comments: RICARDO: Wear generally improved after the longer oil run but insolubles were high. Insolubles were at limits and may show some sludge in the block. We suggest a few short oil runs (~2,500-3,000 miles) to wash the excess wear metals and insolubles from the system. Fuel was present at 2.0%, which is just into our cautionary range. This level may indicate a fuel system problem developing. Fuel likely caused the high insolubles and no other contaminants were found. Check back to monitor after a shorter oil run. Neither fuel nor insolubles should be this high.[/

 

[erhayes]

Thanks Rick's. Yes, 14.7 is the magic number. I do remember way back, that muscle cars would get down to 12:1 when tuned for max power at WOT. If indeed Mazda is allowing or needs a 10:1 mix then I feel there is engineering work to be done. If however; there is a software issue then a re-flash only may be needed. Ed

 

[1Sleepy93]

10:1 is horribly over safe or lazy tune, these motors don't require it but Mazda did it. People who have leaned out the A/F ratio on the Speed6, up to about 11:5-12.5:1, have seen a fair power increase and still no detonation.

I'm really hoping that Cobb or CP-E make something PnP for the CX EMS wise.

 

[erhayes]

I'd hope Mazda will do it.

 

[lisevolution]

I'd hope Mazda will do it.

Don't count on it... mazdas answer to the bogging on the MSP was to advance the timing and do nothing to a/f curve... best investment I made for that car was the DSM AFC which leaned out the curve significantly and showed a huge difference in power and responsiveness. I would expect something like this for the CX7 sometime in the near future

 

[erhayes]

Don't count on it... mazdas answer to the bogging on the MSP was to advance the timing and do nothing to a/f curve... best investment I made for that car was the DSM AFC which leaned out the curve significantly and showed a huge difference in power and responsiveness. I would expect something like this for the CX7 sometime in the near future

DSM AFC IS ?