Shell Rotella T Synthetic 5w40 - '88 Jeep Cherokee 4.0l L6, 3968 Miles

[MNgopher]

Vehicle: '88 Jeep Cherokee
Engine: 4.0l Inline Six
Tranny: 4 Speed Auto

Oil Filter: Napa Gold 1626 (Wix)
Air Filter: Fram
Oil Used: None
Makeup Oil: None

60%City/40%Freeway Mileage.

Period was from 1/05-5/05 in Minnesota weather.

Rot 5w40= Shell Rotella T 5w40 Synthetic
Valv AC 10w30 = Valvoline All Climate 10w30

code:

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Oil Rot Rot Rot Rot Univ.

5w40 5w40 5w40 5w40 Avg.

Mi on Oil 3968 4186 4192 4103

Mi on Unit73150 69182 64995 60803

Date 5/05 1/05 9/04 6/04

Aluminum 5 3 2 2 4

Chromium 1 1 0 1 1

Iron 47 39 15 32 27

Copper 4 2 3 3 5

Lead 7 5 8 17 5

Tin 2 1 1 3 1

Moly 12 7 4 6 37

Nickel 1 0 1 1 1

Manganese 0 0 0 1 1

Silver 0 0 0 0 0

Titanium 0 0 0 0 0

Potassium 0 0 1 2 2

Boron 0 0 0 1 43

Silicon 13 10 9 11 11

Sodium 8 9 10 13 8

Calcium 3293 3698 3153 2929 2035

Magnesium 16 10 8 10 224

Phosphorous1181 846 897 818 757

Zinc 1413 1049 1022 984 911

Barium 1 1 2 1 0

TBN 1.9 1.3 2.9 2.3

Vis@100C 14.2 11.8 13.3 11.4

Flashpoint405 300 345 365

Fuel 0 4.5% 2.3% 1.2%

Antifreeze0 0 0 0

Water 0 0 0 0

Insolubles0.3 0.5 0.4 0.4

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Well, as I reported in my previous thread on this vehicle, I identified an injector leaking allowing fuel to drain into the oil after shutdown.

I ordered new Ford 19lb injectors from a great outfit in California to replace the crappy 18.6934646541 lb/hour units that were OEM. This is a pretty standard replacement for this vintage of Jeeps. I got those waaay back in March and never had a chance to deal with it until early in the month of May.

New injectors and plugs are in. Runs great!

I think this UOA shows the results of the fuel being in the oil earlier, but with the fix in place, no trace of the fuel that caused the numbers. I think the Rotella T Syn did a great job considering the abuse it was under.

I've switched to Citgo Supergard Synthetic 10w30. I grew tired of going to Wal-Mart to procure the Rotella T Synthic 5w40, as that literally was the ONLY thing I ever bought there. Citgo seems to put out some quality lubricants, and price on this was around the same as the Rotella T Synthetic was.

We'll see...

 

[Al]

As in your other post..good information, again easy to follow. I agree you are seeing the results of the last cycle. You maybe should consider the AutoRx??