Gokhan
Thread starter
Originally Posted By: ZeeOSix
Originally Posted By: Gokhan
Research by Shell indicates thinner oil results in larger MOFT at top piston rings. The reason is that thinner oil flows faster through the ring gaps.
PDF link for the Shell research article
I forgot to mention earlier ... apparently it didn't help reduce the ring wear because your chromium showed higher particle counts with the 0W-20 vs the 0W-40.
0W-40 = 2.1 ppm Cr
0W-20 = 2.6 & 5.5 ppm Cr
As I mentioned before, addition of the ACDelco cooling-system seal tabs before the M1 0W-40 fill stopped the oil thickening, which means it stopped the coolant contamination with glycol, leading to better Pb and Cr numbers. The last TGMO run had the worst oil thickening due to coolant contamination and worst Pb and Cr numbers as a result. Glycol is especially corrosive with certain metals such as Pb and Cr and it also creates explosive bubbles at the cylinders. Na, coming from a coolant additive, is another indicator of the coolant contamination. So, M1 0W-40 ran without any coolant contamination.
Next fill will be TGMO 0W-20 and coolant-contamination-free, and this should be verified.
Originally Posted By: Gokhan
Research by Shell indicates thinner oil results in larger MOFT at top piston rings. The reason is that thinner oil flows faster through the ring gaps.
PDF link for the Shell research article
I forgot to mention earlier ... apparently it didn't help reduce the ring wear because your chromium showed higher particle counts with the 0W-20 vs the 0W-40.
0W-40 = 2.1 ppm Cr
0W-20 = 2.6 & 5.5 ppm Cr
As I mentioned before, addition of the ACDelco cooling-system seal tabs before the M1 0W-40 fill stopped the oil thickening, which means it stopped the coolant contamination with glycol, leading to better Pb and Cr numbers. The last TGMO run had the worst oil thickening due to coolant contamination and worst Pb and Cr numbers as a result. Glycol is especially corrosive with certain metals such as Pb and Cr and it also creates explosive bubbles at the cylinders. Na, coming from a coolant additive, is another indicator of the coolant contamination. So, M1 0W-40 ran without any coolant contamination.
Next fill will be TGMO 0W-20 and coolant-contamination-free, and this should be verified.