Pontiac GTP L67 3800, PP 10w30 4.5k

[ATS-V]

Latest run on PP, this time I ran a 10w30 as this is what the engine is actually spec'ed for FWIW.


Code:


OIL TYPE PP PP PP GC GC GC

OIL GRADE 10w30 5w30 5w30 0W30 0W30 0w30

MILES IN USE 4.5k 4.4k 4.6k 4.4k 4.3k 4.4k

MILES 182.2k 177.7k 173.3k 164.8k 156.8k 152.5k

SAMPLE TAKEN 7/26/09 4/19/09 1/23/09 8/2/08 2/9/08 10/27/07



ALUMINUM 3 2 3 2 3 2

CHROMIUM 0 0 1 1 1 0

IRON 8 9 13 12 14 12

COPPER 15 9 12 12 14 14

LEAD 5 4 8 18 14 22

TIN 0 1 1 0 2 0

MOLYBDENUM 54 53 50 3 2 6

NICKEL 1 0 1 1 1 0

MANGANESE 2 0 0 1 0 0

SILVER 0 0 0 0 0 0

TITANIUM 0 0 0 0 0 0

POTASSIUM 12 17 22 9 16 6

BORON 30 26 25 4 3 5

SILICON 7 5 7 8 8 7

SODIUM 26 36 48 23 35 19

CALCIUM 3026 3067 3267 2494 1896 1866

MAGNESIUM 22 34 131 593 563 525

PHOSPHORUS 742 703 766 981 870 842

ZINC 979 870 1082 1251 1066 1082

BARIUM 0 0 0 0 0 0





INSOLUBLES 0.3 0.3 0.3 0.3 0.3 0.4

WATER 0 0 0 0 0 0

FLASHPOINT ºF 420 400 385 405 415 415

SUS VIS 210ºF 60.7 59.5 61 66.9 67.7 66.8

cSt VIS 100°C 10.41 10.08 10.51 12.13 12.35 12.11



Code:


GC M1 M1 M1 M1-EP M1 M1 M1 M1

0w30 5w30* 5w30* 5w30 5w30 5w30 10w30 5w30 10w30

4.6k 4.8k 5.5k 5.7k 5.6k 6.2k 8.7k 7k 5k Uni Avg

148.1k 143.5k 138.7k 133.2k 128k 121.9k 115.7k 107k 95k

7/21/07 4/7/07 1/6/07 9/2/06 5/7/06 1/7/06 8/21/05 2/28/05 6/6/04



3 4 3 2 2 3 2 2 2 3

1 1 1 0 1 1 1 1 1 1

17 24 19 14 16 22 18 17 13 14

13 12 14 14 13 15 17 13 16 18

19 10 14 28 11 23 42 5 5 7

0 0 0 1 0 0 1 2 1 1

18 91 84 82 72 85 77 60 70 41

1 1 2 0 0 1 0 0 1 0

0 0 1 1 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0

10 20 9 6 6 11 17 11 7 7

12 57 60 51 122 55 106 104 150 45

9 11 11 11 11 12 9 9 11 11

24 46 20 6 9 10 14 12 19 11

2013 2564 2308 2731 2294 2705 2780 2302 3134 2128

424 20 15 14 19 19 19 25 23 131

797 737 658 673 698 677 745 592 831 741

1041 932 818 834 870 838 946 694 983 901

0 0 0 0 0 0 0 0 0





0.3 0.3 0.3 0.3 0.3 0.3 0.4 0.4 0.5

0 0 0 0 0 0 0 0.1 0

395 405 395 390 370 395 425 385 375

67.7 63.6 64.4 63.2 62.5 61.8 65.3 63 62.2

12.33 11.22 11.44 11.11 10.91 10.7 11.68 11.05 10.8

 

[Colt45ws]

I'd say it looks good, in my unprofessional opinion.
I also think it could be run longer.

 

[1999nick]

Any run of the mill dino should be able to show exemplary figures in a 4500 mile OCI. Any so-called synthetic should be able to do the same in a 10,000 mile OCI. Back in the days before I retired, from the mid 1970's on, I used Mobil 1 for a one year, usually 18,000 to 20,000 mile OCI. Never an oil problem in almost 30 years. Engines always stayed quiet and smooth up to 140,000 miles, which was as long as I ever kept a car (or truck).

 

[Rabbler]

Looking good!
Looks like PP is a good match for your engine.
Bit of a copper spike on the last UOA but nothing to worry about.
I'd try 7500 Miles this time.
What oil filter you using?

 

[ATS-V]

Originally Posted By: 1999nick
Any run of the mill dino should be able to show exemplary figures in a 4500 mile OCI. Any so-called synthetic should be able to do the same in a 10,000 mile OCI. Back in the days before I retired, from the mid 1970's on, I used Mobil 1 for a one year, usually 18,000 to 20,000 mile OCI. Never an oil problem in almost 30 years. Engines always stayed quiet and smooth up to 140,000 miles, which was as long as I ever kept a car (or truck).


Originally Posted By: Rabbler
Looking good!
Looks like PP is a good match for your engine.
Bit of a copper spike on the last UOA but nothing to worry about.
I'd try 7500 Miles this time.
What oil filter you using?


I'm not going to much further in miles than this UOA since I have a small coolant leak to keep an eye on.

An for all those that said the source of my earlier bearing wear was due to coolant, not so. I had used all my SL Mobil1 on my first 2 analysis at that point I got more (SM M1) and bearing wearing increased. I tried to add some 15w50 since it looked as if the wear increased because because the oil was too thin for the application (improved slightly in winter). After not seeing the results I wanted I bought several oil changes worth of GC, no really improvement. After the GC stash was finish I decided to try PP and low and behold I found a winner.

 

[tig1]

Originally Posted By: 1999nick
Any run of the mill dino should be able to show exemplary figures in a 4500 mile OCI. Any so-called synthetic should be able to do the same in a 10,000 mile OCI. Back in the days before I retired, from the mid 1970's on, I used Mobil 1 for a one year, usually 18,000 to 20,000 mile OCI. Never an oil problem in almost 30 years. Engines always stayed quiet and smooth up to 140,000 miles, which was as long as I ever kept a car (or truck).


I thought I might be the longest M1 user here. You may have me beat. I started in the spring of 78. How about you.

 

[1999nick]

Originally Posted By: tig1
Originally Posted By: 1999nick
Any run of the mill dino should be able to show exemplary figures in a 4500 mile OCI. Any so-called synthetic should be able to do the same in a 10,000 mile OCI. Back in the days before I retired, from the mid 1970's on, I used Mobil 1 for a one year, usually 18,000 to 20,000 mile OCI. Never an oil problem in almost 30 years. Engines always stayed quiet and smooth up to 140,000 miles, which was as long as I ever kept a car (or truck).


I thought I might be the longest M1 user here. You may have me beat. I started in the spring of 78. How about you.


Hey, I don't recall the exact year, but it was sometime in the last half of the 1970's. I retired in 2001, and went back to using dino for a few years, since I was only driving about 6000 miles a year, but now I have gone back to M1 since my mileage per year has increased to about 10,000. I am now using M1 10W30 High Mileage oil, since my 2005 Nissan Pathfinder calls for a 5W30 or 10W30 or 10W40, all in SL formulation. The M1 High Mileage oils are all SL's.

 

[Rabbler]

Originally Posted By: 97 GTP


I'm not going to much further in miles than this UOA since I have a small coolant leak to keep an eye on.



Oops... completely missed the elevated potassium and sodium.
must be a pretty small leak.

 

[ATS-V]

Thanks for the input guys.

 

[zulu]

Originally Posted By: Rabbler
Originally Posted By: 97 GTP


I'm not going to much further in miles than this UOA since I have a small coolant leak to keep an eye on.



Oops... completely missed the elevated potassium and sodium.
must be a pretty small leak.


I remember your last UOA post. You've had the leak at least since 95K (all your UOAs show eleveated K). Here you are almost 100K later and still going strong. Don't change a thing. I think it's a toss up between 5w or 10w.

 

[Coogles]

Originally Posted By: zulu
Originally Posted By: Rabbler
Originally Posted By: 97 GTP


I'm not going to much further in miles than this UOA since I have a small coolant leak to keep an eye on.



Oops... completely missed the elevated potassium and sodium.
must be a pretty small leak.


I remember your last UOA post. You've had the leak at least since 95K (all your UOAs show eleveated K). Here you are almost 100K later and still going strong. Don't change a thing. I think it's a toss up between 5w or 10w.


I've been around these engines a long time and thos stock plastic intake manifold gaskets ALWAYS fail. If you're capable, it would still be wise to take car of that coolant leak and replace the lower intake gaskets with the redesigned aluminum ones from GM. They're about $35 if I remember correctly.

Pick up a genuine GM service manual from eBay and tackle the job. Shouldn't take more than 3-5 hours even if you've never torn into the motor before.

 

[zulu]

Originally Posted By: Coogles
Originally Posted By: zulu
Originally Posted By: Rabbler
Originally Posted By: 97 GTP


I'm not going to much further in miles than this UOA since I have a small coolant leak to keep an eye on.



Oops... completely missed the elevated potassium and sodium.
must be a pretty small leak.


I remember your last UOA post. You've had the leak at least since 95K (all your UOAs show eleveated K). Here you are almost 100K later and still going strong. Don't change a thing. I think it's a toss up between 5w or 10w.


I've been around these engines a long time and thos stock plastic intake manifold gaskets ALWAYS fail. If you're capable, it would still be wise to take car of that coolant leak and replace the lower intake gaskets with the redesigned aluminum ones from GM. They're about $35 if I remember correctly.

Pick up a genuine GM service manual from eBay and tackle the job. Shouldn't take more than 3-5 hours even if you've never torn into the motor before.


I agree, although with 182K on the ticker, there is some law of diminishing return here. How much longer would it last if $500 were sunk into the LIM gaskets vs. just letting it run it's course. If this were a 125K or less vehicle, then I'd be more inclined to suggest that, but a 12 year supercharged Grand Prix with that many miles has more than exceeded GM's life expectancy.