OK, so I rang the Valvoline technical hotline (in Australia) and I asked them about this ACEA A3/B4/C3 rating for their SynPower MST 5W30 oil (product # 1186).
I politely asked how an oil could both be A3/B4 rated (sulphated ash >1.0 & 10) and C3 rated (sulphated ash 6) both at the same time.
The tech. had no idea what the ACEA ash or TBN levels were, but assured me that valvoline worked to the latest ACEA standard (2012) and that they did have those three ratings. There was no problem.
He couldn't believe that I knew what the ACEA sulphated ash levels were, he didn't know what they were, but I was probably wrong.
He said the MST product had a sulphated ash of < 1.0 and a TBN = 6.8 (the only on-line product info he had access to).
I politely said that to rate the oil for the latest A3/B4 standard, the oil needed a TBN of >=10, and to make the 2008 standard it still needed to be >=8.
He also basically said I was a trouble maker and I should go away.
I politely asked how an oil could both be A3/B4 rated (sulphated ash >1.0 & 10) and C3 rated (sulphated ash 6) both at the same time.
The tech. had no idea what the ACEA ash or TBN levels were, but assured me that valvoline worked to the latest ACEA standard (2012) and that they did have those three ratings. There was no problem.
He couldn't believe that I knew what the ACEA sulphated ash levels were, he didn't know what they were, but I was probably wrong.
He said the MST product had a sulphated ash of < 1.0 and a TBN = 6.8 (the only on-line product info he had access to).
I politely said that to rate the oil for the latest A3/B4 standard, the oil needed a TBN of >=10, and to make the 2008 standard it still needed to be >=8.
He also basically said I was a trouble maker and I should go away.