Chevy 4.3 Mobil 1 3495 miles

[tyrannosaurusrex8888]

Here is the latest uoa on my 2002 Chevy Silverado.
20,255 miles on truck. Mobil 1 5w-30 3495 miles on oil. PF-47 filter. Original air filter.
3495 miles 4272 miles(Last summer)May-oct.

Aluminum.....3......2
Chromium.....1......1
Iron.........15.....24
Copper.......4......6
Lead.........16.....31
Tin..........2......0
Moly.........73.....65
Nickel.......0.......0
Potassium....2......2
Boron........145....112
Silicon......36.....62
Sodium.......10.....26
Calcium......2260...2755
Magnesium.....19....17
Phosphorus....736...698
zinc..........848....758

Sus vis@ 210 60.6, Flashpoint 405, Fuel 0.5 Antifreeze 0 insolubles 0.4.
This oil was in use from Oct.7th to Feb.7th.

German Castol is now in truck.

 

[Schmoe]

Lead came down, so did the silicon. Still too high for my taste. This may be a classical example that thicker is better.

 

[TooSlick]

Do you remember when they first put road salt down last fall? The level of sodium in the May-Oct analysis troubles me ....

Could be the common GM coolant leak at the intake manifold?

 

[Al]

quote:

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Originally posted by TooSlick:
Do you remember when they first put road salt down last fall? The level of sodium in the May-Oct analysis troubles me ....

Could be the common GM coolant leak at the intake manifold?

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ThePotassium would be higher, I believe. (Firsthand experience

) However it's a thought and could explain the lead

. This looks like a job for Blackstone/Terry .

 

[TooSlick]

Whats the specific additive chemistry of Dexcool?

I've seen 700 ppm of sodium and no potassium in Mercruiser inboard motors, with cylinder head gasket leaks - I saw 70-80 ppm of boron just from the contamination. You'll note B is higher in this most recent sample...

TS

 

[greasezerk]

Trex, try going to the pf 52 filter. That is the longer version of the pf 47 you are now using. Im surprized to see a 47 filter on a 4.3 engine.

 

[Al]

quote:

---

Originally posted by TooSlick:
Whats the specific additive chemistry of Dexcool?

I've seen 700 ppm of sodium and no potassium in Mercruiser inboard motors, with cylinder head gasket leaks - I saw 70-80 ppm of boron just from the contamination. You'll note B is higher in this most recent sample...

TS

---

My potassium was 22 and sodium 4 after about 6K miles.

 

[Last_Z]

What about the Silicon guys? This engine at 20k+ miles is well past break-in. I would inspect the entire induction system.

 

[wtd]

These results look alot like the ones I used to get on my 5.7L using Mobil 1. Not very impressive in my opinion.

Wayne

 

[nel]

You might want to add Schaeffer's #132 and Lube Control to your oil. I ran about the same number of miles as you on my GMC Sonoma 4.3L this summer using Pennzoil 10W30. Here are the wear metals from my oil analysis (Schaeffer Labs):

Copper 2
Iron 5
Chromium 0
Aluminum 1
Lead 6

and the link to my post of the UOA: Sonoma UOA

 

[JHZR2]

I got the worries after seeing K and Na in my UOAs for my 98 S10 ZR2. But the dealer had a good lookover and couldnt find anything. They put in some dye, and we'll see next time with a blacklight AND UOA. I think that these engines just seep a bit sometimes... It seems real common to see the K and Na in analyses for these engines.

JMH

 

[wtd]

JMH,
When I got back an oil analysis report on my 98 chevy with the 5.7L that showed high potassium, I took the truck to the dealer. They did a coolant pressure test, which came back fine, and the dye in the coolant which never showed up in my oil.

After a second analysis came back with even higher potassium, I had the truck repaired which it turned out to be bad intake manifold gaskets.

My point is, don't rely on the dealership to always give you an accurate picture of what is going on. Everything mine did, did not even indicate there was a problem. Looking at the old intake gaskets, it was clear where they had been leaking. Good luck on yours.

Wayne

 

[dickwells]

Wayne, Could you notice any drop in the antifreeze level during this period?

 

[JHZR2]

excellent point... Im waiting on my 3000 miles so that I can have it tested again. Had a 3k OCI, came back with some, then did a 1700 mi, and it was much lower, definitely not proportionate. So we shall see now. Im hoping it was a fluke, but only OCI can determine that.

I dont see any coolant level drop, in my suspect 4.3

JMH