AD/ENG/4 Amd11 does not recommend oil changes, it requires them to be done. It has given a standard + or - 10% tolerance. Previous amendments allowed the tolerance only if the manufacturer gave one ( continental yes, lycoming mostly no). It also now requires a filter change, previous amendments allowed for long filters on continentals to go for 100 hours.
So in short, yes you have a tolerance of 10%, and you DO have to do one. I am sure amendment 12 will move the goal posts again.