We still found signs of anti-freeze (see potassium & sodium) in the oil but level did come down. However, lead from bearings almost doubled and it may due to the coolant. Or, it may be from a particle streak through the bearings. If the latter is the case, lead will decline in the next sample. The oil's viscosity was a bit higher than normal for a 0W/30-grade, measuring closer to a 40W. We doubt it caused the higher-than-average lead. Air and oil filtration were normal and no gas was present in the
sample. Try ~5000 miles and check back for another look at lead.
Code:
OIL GC0w30 M5w30* M5w30* M5w30 M5w30EPM5w30 M10w30 M5w30 M10w30
MILES IN USE 4.6k 4.8k 5.5k 5.7k 5.6k 6.2k 8.7k 7k 5k Uni Avg
MILES 148.1k 143.5k 138.7k 133.2k 128k 121.9k 115.7k 107k 95k
SAMPLE TAKEN 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
ALUMINUM 3 4 3 2 2 3 2 2 2 3
CHROMIUM 1 1 1 0 1 1 1 1 1 1
IRON 17 24 19 14 16 22 18 17 13 14
COPPER 13 12 14 14 13 15 17 13 16 18
LEAD 19 10 14 28 11 23 42 5 5 7
TIN 0 0 0 1 0 0 1 2 1 1
MOLYBDENUM 18 91 84 82 72 85 77 60 70 41
NICKEL 1 1 2 0 0 1 0 0 1 0
MANGANESE 0 0 1 1 0 0 0 0 0 0
SILVER 0 0 0 0 0 0 0 0 0 0
TITANIUM 0 0 0 0 0 0 0 0 0 0
POTASSIUM 10 20 9 6 6 11 17 11 7 7
BORON 12 57 60 51 122 55 106 104 150 45
SILICON 9 11 11 11 11 12 9 9 11 11
SODIUM 24 46 20 6 9 10 14 12 19 11
CALCIUM 2013 2564 2308 2731 2294 2705 2780 2302 3134 2128
MAGNESIUM 424 20 15 14 19 19 19 25 23 131
PHOSPHORUS 797 737 658 673 698 677 745 592 831 741
ZINC 1041 932 818 834 870 838 946 694 983 901
BARIUM 0 0 0 0 0 0 0 0 0 0
INSOLUBLES 0.3 0.3 0.3 0.3 0.3 0.3 0.4 0.4 0.5
WATER 0 0 0 0 0 0 0 0.1 0
FLASHPOINT ºF 395 405 395 390 370 395 425 385 375
SUS VIS 210 ºF 67.7 63.6 64.4 63.2 62.5 61.8 65.3 63 62.2
*4qts M1 5w30 + 1qt M1EP 15w50
It seems that lead went up again even though the sodium and potassium levels are half what they were. I added GM coolant tabs to the system a few weeks after this oil went in since there was a trace of coolant in the last analysis. Since then I monitored the coolant with a dipstick type measuring device. Since this is the first run with GC I'll see how the next sample looks before taking action.
Comments welcome
sample. Try ~5000 miles and check back for another look at lead.
Code:
OIL GC0w30 M5w30* M5w30* M5w30 M5w30EPM5w30 M10w30 M5w30 M10w30
MILES IN USE 4.6k 4.8k 5.5k 5.7k 5.6k 6.2k 8.7k 7k 5k Uni Avg
MILES 148.1k 143.5k 138.7k 133.2k 128k 121.9k 115.7k 107k 95k
SAMPLE TAKEN 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
ALUMINUM 3 4 3 2 2 3 2 2 2 3
CHROMIUM 1 1 1 0 1 1 1 1 1 1
IRON 17 24 19 14 16 22 18 17 13 14
COPPER 13 12 14 14 13 15 17 13 16 18
LEAD 19 10 14 28 11 23 42 5 5 7
TIN 0 0 0 1 0 0 1 2 1 1
MOLYBDENUM 18 91 84 82 72 85 77 60 70 41
NICKEL 1 1 2 0 0 1 0 0 1 0
MANGANESE 0 0 1 1 0 0 0 0 0 0
SILVER 0 0 0 0 0 0 0 0 0 0
TITANIUM 0 0 0 0 0 0 0 0 0 0
POTASSIUM 10 20 9 6 6 11 17 11 7 7
BORON 12 57 60 51 122 55 106 104 150 45
SILICON 9 11 11 11 11 12 9 9 11 11
SODIUM 24 46 20 6 9 10 14 12 19 11
CALCIUM 2013 2564 2308 2731 2294 2705 2780 2302 3134 2128
MAGNESIUM 424 20 15 14 19 19 19 25 23 131
PHOSPHORUS 797 737 658 673 698 677 745 592 831 741
ZINC 1041 932 818 834 870 838 946 694 983 901
BARIUM 0 0 0 0 0 0 0 0 0 0
INSOLUBLES 0.3 0.3 0.3 0.3 0.3 0.3 0.4 0.4 0.5
WATER 0 0 0 0 0 0 0 0.1 0
FLASHPOINT ºF 395 405 395 390 370 395 425 385 375
SUS VIS 210 ºF 67.7 63.6 64.4 63.2 62.5 61.8 65.3 63 62.2
*4qts M1 5w30 + 1qt M1EP 15w50
It seems that lead went up again even though the sodium and potassium levels are half what they were. I added GM coolant tabs to the system a few weeks after this oil went in since there was a trace of coolant in the last analysis. Since then I monitored the coolant with a dipstick type measuring device. Since this is the first run with GC I'll see how the next sample looks before taking action.
Comments welcome