Esso Superflo Syn. 5W-30 GMC Truck 5.7L

[Ron Jeremy]

This report is from a friend's truck and it isn't
pretty. Would anyone care to offer a theory on
the low tbn and high oxid. numbers. Could he have
a mechanical problem or is this a poor oil?

Unit: 1997 GMC Sierra (5.7L)
Miles on unit: 51263
Miles on sample: 4660
Oil: Esso (Exxon) Superflo Synthetic 5w30

code:

---

Iron: 68

Chrom.: 1

Lead: 39

Copper: 7

Tin: 0

Alum.: 5

Nickel: 0

Silver: 0

Silicon: 26

Boron: 41

Sodium: 36

Mag.: 14

Calcium: 2365

Barium: 0

Phos.: 1115

Zinc: 1240

Moly.: 8

Titanium: 0

Vanadium: 0

Potassium:0



Fuel %:
Vis @ 40C cSt: N/A

Vis @ 110C cSt: 9.42

Water%:0

Soot/Solids: N/A

Glycol: Neg



TBN: 0.45 (Abnormal)

Oxid.: 86.0 (Abnormal)

Nitr: 15.0

Change: Yes

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[ June 28, 2003, 02:06 PM: Message edited by: BOBISTHEOILGUY ]

 

[Ron Jeremy]

BTW, This analsis was performed by Oil Analyzers Inc.

 

[Patman]

Did this oil get run through our cold winter up here? If so, that's probably the biggest factor.

Quite a high number for silicon, so I suspect an air leak too, which in turn is causing the higher iron and lead as well.

 

[Ron Jeremy]

Patman, Yes he ran this batch for most of the winter. I attributed his high si number to his K&N air filter, but that could be up for debate.

 

[Patman]

That explains it then. Tell him to chuck the K&N air filter, and take a sample with mostly warm weather conditions, and I bet his next UOA is much better.

 

[Ron Jeremy]

Patman, winter or not, wouldn't you expect more from what is supposed to be Esso's top tier gasoline engine oil?

 

[MNgopher]

Another winter killed oil. As patman said, run it over the summer and the numbers will likely look much better. Best advice: Keep the winter interval short (ie: 3000 miles or so).

If this is a Group III oil, then the performance is right in line with other dino oils in the cold

Cold weather seems to really be a huge killer of oil - perhaps more so than hot weather!

[ June 29, 2003, 01:08 AM: Message edited by: MNgopher ]

 

[Patman]

quote:

---

Originally posted by Ron Jeremy:
Patman, winter or not, wouldn't you expect more from what is supposed to be Esso's top tier gasoline engine oil?

---

Not really. With a large engine that has a large cooling system, it takes forever to warm up in a cold winter like we had. I ran one of the best oils in my Firebird last winter (Schaeffer Oil) and it still didn't show me great results. I don't think any oil at all will show great results in a large engine during a cold winter, those conditions are just murder for oil.