Gokhan
Thread starter
Regarding coolant contamination, if you regard oil thickening (increase in KV100) as the main indicator, previous TGMO 0W-20 SN fill seems to be the worst and it seems to have been gone in the M1 0W-40 SN fill after GM-tabs treatment.
Virgin KV100 for M1 and TGMO are 13.5 cSt and 8.79 cSt, respectively.
So, M1 ran clean without contamination and still seems to have done worse in Fe and Ni wear (valvetrain?). I think Cr and Pb are mostly a result of the coolant contamination and that's why the previous TGMO with the highest KV100 (most thickened due to coolant) was the worst.
I've done a second GM-tabs treatment and the next OCI should definitely be free of coolant contamination as well. I expect the next TGMO fill to beat M1 easily but we will see.
Also, before the PYB fill, it was Mobil Delvac 1300 Super 15W-40 CJ-4 and I blame that very thick oil for the high Fe with PYB.
Also, it will be nice to restore the fuel economy back with TGMO 0W-20. M1 0W-40 seems to have hit the fuel economy quite a bit.
Still keep complaining about CAFE if you want. Neither wear nor fuel economy numbers are on your side. They sell the outdated xW-40 and xW-50 grades in some countries while the US and Japan enjoy the better, modern viscosity grades. It's the economics of the world, as they need to sell the thicker base stocks coming out of the refinery somewhere. They may get the 0W-20 when the US and Japan get the 0W-8, 0W-12, and 0W-16.
By the way, the new M1 formulation, named M1 FS 0W-40 SN, is practically a 0W-30, with KV100 being 12.9 cSt. If it was 12.4 cSt, it would be officially a 0w-30. Mobil 1 also knows that 0W-40 is becoming outdated.
Virgin KV100 for M1 and TGMO are 13.5 cSt and 8.79 cSt, respectively.
So, M1 ran clean without contamination and still seems to have done worse in Fe and Ni wear (valvetrain?). I think Cr and Pb are mostly a result of the coolant contamination and that's why the previous TGMO with the highest KV100 (most thickened due to coolant) was the worst.
I've done a second GM-tabs treatment and the next OCI should definitely be free of coolant contamination as well. I expect the next TGMO fill to beat M1 easily but we will see.
Also, before the PYB fill, it was Mobil Delvac 1300 Super 15W-40 CJ-4 and I blame that very thick oil for the high Fe with PYB.
Also, it will be nice to restore the fuel economy back with TGMO 0W-20. M1 0W-40 seems to have hit the fuel economy quite a bit.
Still keep complaining about CAFE if you want. Neither wear nor fuel economy numbers are on your side. They sell the outdated xW-40 and xW-50 grades in some countries while the US and Japan enjoy the better, modern viscosity grades. It's the economics of the world, as they need to sell the thicker base stocks coming out of the refinery somewhere. They may get the 0W-20 when the US and Japan get the 0W-8, 0W-12, and 0W-16.
By the way, the new M1 formulation, named M1 FS 0W-40 SN, is practically a 0W-30, with KV100 being 12.9 cSt. If it was 12.4 cSt, it would be officially a 0w-30. Mobil 1 also knows that 0W-40 is becoming outdated.