PP 0W20 10,407mi 07 Caliber

[74DartSport]

Still looking good. I think I pushed it as far as it could go without adding any make up oil. It was still ½ way up the dipstick.
Code:


Miles on oil 10,407 6,025 4,544 Universal

Miles on unit 93,415 83,008 76,983 Averages

Sample date 05/3/14 10/22/13 06/23/2013

Make up oil added 0 0 0

OIL TYPE PP 0W20 PP 5W-20 PP 5W-20

Aluminum 5 2 2 4

Chromium 1 0 0 1

Iron 13 4 4 8

Copper 1 1 1 2

Lead 0 0 0 0

Tin 0 0 0 1

Molybdenum 187 52 58 80

Nickel 0 0 0 0

Manganese 0 0 0 0

Silver 0 0 0 0

Titanium 0 0 2 0

Potassium 2 1 1 1

Boron 25 11 61 37

Silicon 9 12 11 12

Sodium 10 3 4 35

Calcium 2221 2525 2521 2443

Magnesium 10 21 67 46

Phosphorus 516 631 730 699

Zinc 632 710 887 819

Barium 0 0 0 0







SUS Viscosity @210F 52.7 53.8 55.0

cSt Viscosity @100C 8.1 8.42 8.77

Flashpoint 410 440 425

Fuel %
Antifreeze % 0.0 0.0 0.0

Water % 0.0 0.0 0.0

Insolubles % 0.2 0.1 0.2

TBN 0.5 2.3 2.0

 

[daves87rs]

What TBN?

 

[gregk24]

You certainly pushed it as far as it could go, probably past due though as you dont know the TAN number. If its higher than the TBN (which it probably is) then most likely the oil was done a while ago. But your wear numbers are decent! Thanks for posting.

 

[HTSS_TR]

I would reduce OCI down to around 8k miles, TBN at 0.5 is too low I like TBN at no less than 1.5-2.0

 

[mongo161]

It all really depends on the TAN number.

 

[CarbonSteel]

Originally Posted By: gregk24
You certainly pushed it as far as it could go, probably past due though as you dont know the TAN number. If its higher than the TBN (which it probably is) then most likely the oil was done a while ago. But your wear numbers are decent! Thanks for posting.

While his TBN is too low at 0.5, the TAN crossing the TBN number does not automatically mean the oil is "done". The fact that his wear metals are fairly low is a direct indicator of this. I would have capped it at 1-2 TBN, but I have had runs where my TAN was much higher than TBN and the UOA was still fine.

 

[dustyroads]

Thanks for testing and posting!

You pushed it to the limit but that's all. No signs of bearing corrossion so I don't see a problem. If the TAN was way too high I think you would see it in bearing metals. When I pushed my oil a little too far (low tbn/high tan) in my truck it showed much more copper and lead.

How long was the oil in the sump (time)?

Never mind I just saw your sample dates....looks like oil went in last fall. Thanks

 

[dparm]

Pay for TAN analysis next time. I don't think 10k is the best idea but it's not a huge problem yet. The iron went up by more than double, though nothing else looks horribly out of place.

 

[901Memphis]

You could have used that extra half a quart of space to top off and boost the TBN. Next time when it gets low, top it off with some Pyb.

 

[rhhsiao]

Sure TBN is below the "magic threshold" of 1.0, but there is a only a slight uptick in iron. Even if TAN is high, the acidic state of the oil hasn't increased wear anymore than a longer run produces normally. 10K OCIs sound like a nice round number to deal with and the oil is doing just fine.

 

[bigt61]

Does "still ½ way up the dipstick" mean it was half a quart low? If it's a long dipstick, that remark taken literally could mean anything. I always top off when I'm half a quart low unless I'm changing the oil the next day. Topping off would obviously make a few UOA #'s look better. 10K was probably enough.