With all the talk of piston deposits, formation, causes, and how to avoid them, thought it would be relevant to see how they're tested for. In order to evaluate piston deposits and oxidation thickening, the sequence IIIH is used.
Analysis includes visual inspection and:
For GF-6, and now GF-7, the WPD has to be at least 4.2. (higher the better). Unfortunately no change for GF-7.
GF-6 Motor Oils using Sustainable Base Oils
Here is an example from a white paper from Biosynthetic using estolides to help with deposit control. Not the only thing that can be used but this was an example of adding estolides to the formulation to help resist deposit formation.
*Green line is where Amsoil scored back in 2014 on the IIIG double length test.
So if your engine develops deposits from neglected maintanence, or using subpar quality oil, use Valvoline R&P to clean up and then either stay with it or use a higher quality synthetic like the Mobil 1's, Amsoil's, HPL's etc....to keep pistons clean.
Analysis includes visual inspection and:
- Kv increase
- Wear Metals
- Total Base Number
- Total Acid Number
- Oxidation and Nitration.
For GF-6, and now GF-7, the WPD has to be at least 4.2. (higher the better). Unfortunately no change for GF-7.
GF-6 Motor Oils using Sustainable Base Oils
Here is an example from a white paper from Biosynthetic using estolides to help with deposit control. Not the only thing that can be used but this was an example of adding estolides to the formulation to help resist deposit formation.
*Green line is where Amsoil scored back in 2014 on the IIIG double length test.
So if your engine develops deposits from neglected maintanence, or using subpar quality oil, use Valvoline R&P to clean up and then either stay with it or use a higher quality synthetic like the Mobil 1's, Amsoil's, HPL's etc....to keep pistons clean.