I changed this out when the OLM read 25% and it had about seven track days on it. Blackstone commented that the aluminum was up a bit but called it "barely out of spec", and they also noted that the viscosity was just barely out of grade. Although iron was up from last time, it's actually way down on a per-mile basis.
I had asked if I should consider something like 0w40 or even 15w50 (which is what GM suggests for track use), but they didn't think that would really make a difference. I think I am going to try a shorter interval next time, but I welcome opinions. I still have one more free oil change from GM.
Code:
OIL M1 5w30 M1 5w30
MILES IN USE 5,651 741
MILES 6,392 741
SAMPLE TAKEN 9/22/17 4/12/17
ALUMINUM 10 3
CHROMIUM 2 1
IRON 53 48
COPPER 13 28
LEAD 1 1
TIN 0 0
MOLYBDENUM 76 84
NICKEL 0 0
MANGANESE 2 2
SILVER 0 0
TITANIUM 0 0
POTASSIUM 5 10
BORON 54 106
SILICON 40 74
SODIUM 5 7
CALCIUM 956 1043
MAGNESIUM 682 624
PHOSPHORUS 627 692
ZINC 733 753
BARIUM 0 0
INSOLUBLES 0.1 -
WATER 0 0
FLASHPOINT ºF 390 SHORT
SUS VIS 210ºF 54.8 -
cSt @ 212ºF 8.71 SHORT
TBN 4.6 6.2
TAN 4.7 1.9
I had asked if I should consider something like 0w40 or even 15w50 (which is what GM suggests for track use), but they didn't think that would really make a difference. I think I am going to try a shorter interval next time, but I welcome opinions. I still have one more free oil change from GM.
Code:
OIL M1 5w30 M1 5w30
MILES IN USE 5,651 741
MILES 6,392 741
SAMPLE TAKEN 9/22/17 4/12/17
ALUMINUM 10 3
CHROMIUM 2 1
IRON 53 48
COPPER 13 28
LEAD 1 1
TIN 0 0
MOLYBDENUM 76 84
NICKEL 0 0
MANGANESE 2 2
SILVER 0 0
TITANIUM 0 0
POTASSIUM 5 10
BORON 54 106
SILICON 40 74
SODIUM 5 7
CALCIUM 956 1043
MAGNESIUM 682 624
PHOSPHORUS 627 692
ZINC 733 753
BARIUM 0 0
INSOLUBLES 0.1 -
WATER 0 0
FLASHPOINT ºF 390 SHORT
SUS VIS 210ºF 54.8 -
cSt @ 212ºF 8.71 SHORT
TBN 4.6 6.2
TAN 4.7 1.9