RTS 9600 miles 02 jeep wrangler - Dyson

[Gary Allan]

Miles on unit: 65725/56128/50125
Dates tested: 10/9/07 - 9/30/06 - 11-?-05
Mile on oil: 9600/6200/9000
Oil: Rotella T Synth 5w-40
Make up: none
Oil filter: Purolator Prem+(not changed)/PureOne
Fuel adds: RLI injector cleaner.
Labs: Dyson/Bulter/Blackstone


Cu 15/13/8
Fe 78/48/74
Cr 4/2/3
Nickel 4/1/2
Tin 0/2/0
Pb 1/0/0
Al 9/5/6
Silicon 24/15/19
Sodium 22/6/9
Potassium 0/3/2
Moly 19/29/122 (I must have used VSOT several OCI's ago)
Boron 1/2/4
Calcium 2482/3241/2666
Magnesium 27/35/125
Manganese 1/(assumed zero)
Phos 1351/1169/935
Antimony 0/3
Zinc 1546/1398/1234
Barium 1/?/?

Visc @ 40C: 117.6
Visc @100C: 15.5
TAN: 6.02
Flash: 415F
Oxi: 38
Nitr:20
KF: 1146
TBN: 2.6
Fuel: 0.0300
Soot: zero
Gly: zero
VI: 138
Sulfate By Product = 47


Comments: This oil is shot. It did put up a valiant fight ..but it was just outgunned by too many insults. It held visc well but is doing nasties to the cylinder walls. Air filtration is/was new not too long ago, so readings may just be old accumulations ..but I'm going to probe the PCV/CCV plumbing for leaks. This saw mostly short trip usage ..and it looks like it shows. Tune was bad for the first 6200 ..but there seems to be another element involved here. Hopefully I'll find something wrong with the air plumbing.

Current fill is Bruceblend 0w-20-Lite. Will retest between 3k-5k to see what's up.

Questions and comments are always welcome.

 

[TR3-2001SE]

I agree with the comments. I would switch to another air filter and check out the air intake system and retest in 5000 miles.

 

[Gary Allan]

The air filter is pretty new (a few months old) but, yes, a good look-see on the plumbing is in order. What's kinda scary is that the TAN was so high with the TBN still looking like it was protecting the engine. If someone is using Blackstone, I'd opt for the TAN reading instead of the TBN reading. If you're using Terry, both are included in the package price ..plus a buttload more.

 

[MarkC]

Is this your 2.5?
That iron is up there, but the lead looks sweet.

 

[Gary Allan]

You've got to keep in mind that this (both, actually) were back to back 13 month/9k+ OCIs. WAY out there for the service involved. This surely put the oil through a wringer ...and it appears that the wringer won.

 

[Tempest]

Wondering where the TAN came from?

Makes me think there is some serious blow by, but the Nitration isn't all that bad...

 

[JAG]

Check out the super high dissolved water content: 1146 ppm. Ironically, the same water that keeps us alive is what destroys oils. The viscosity at 40C is also high. Assuming the calcium reading is correct, the oil "lost" a lot of calcium detergent. Where oh where it went, I do not know or understand.

 

[Gary Allan]

Yes, there are oddities that I won't even think about trying to decipher. Beyond my scope of understanding. Keep in mind when looking at readings that these are three different labs. B-S, Butler, and whomever Terry uses now. That could account for a few additive differences when you're dealing with hundreds to thousands of ppm.

This would be considered a neglected engine. Oddly, it has virtually no consumption (maybe 2 quart @7-8K miles) and the view through the oil cap is pristine.

I would also figure that EVEN IF I continued with this ill advised routine, I would probably still get 15 years of trouble free ownership. You've got to figure that the oil wasn't shot for the lion's share of the OCI.

I do have some bugs to shake out of the rug, however.

 

[Lonnie]

Magnesium 27/35/125

Where did this spike come from?

 

[MarkC]

Isn't that just an additive?

 

[Gary Allan]

Yes, AFAIK.

 

[tackleberry625]

I would deff try shorter OCIs, just

 

[Gary Allan]

Do you think

......j/k

 

[Geoff]

If you compare this to Gary Allan's 5w-20 post the results are interesting. Higher pb in that post with the thinner stuff, which you might expect with this engine. I think too much dirt/tuning/pcv as you said - OCI too long. The Pure One might have helped the last OCI by removing more of the dirt.