Mid/low SAPS only became a thing when DPF/OPF/GPF came along, for Euros anyway. A car with a conventional cat alone has nothing to worry about. Some early 2000s BMW V8s drink oil and they have 20 years of high SAPS oil but I never hear of cat problems.Agree to disagree -- if the effect was negligible, OEM's would have no issues using high SAPS oils across the board. OEM's have to warranty catalysts for as long as 150K in some states and clearly, this continues to be a concern.