Saw the following in this Amsoil PDF:
Quote:
In recent years, API and ILSAC have reduced the ash content in engine oil to below 0.80% (max) by weight to meet API SM, ILSAC GF-4 specifications. Because all SAE xW-20 engine oils are required to have low ash, there is less tendency for carbon formation when they are burned in the combustion chamber.
I'd love for this to be true, but I haven't found evidence for it yet. For example, Infineum's summary of API and ILSAC specs makes no mention of sulfated ash for SM/GF-4, SN/GF-5, etc.
Was this statement an error on Amsoil's part, or am I missing something?
Quote:
In recent years, API and ILSAC have reduced the ash content in engine oil to below 0.80% (max) by weight to meet API SM, ILSAC GF-4 specifications. Because all SAE xW-20 engine oils are required to have low ash, there is less tendency for carbon formation when they are burned in the combustion chamber.
I'd love for this to be true, but I haven't found evidence for it yet. For example, Infineum's summary of API and ILSAC specs makes no mention of sulfated ash for SM/GF-4, SN/GF-5, etc.
Was this statement an error on Amsoil's part, or am I missing something?