Engine Oil Specification - Aston Martin DB9 2006 Manual

Engine Oil Specification

An oil of 0W-40 viscosity meeting Aston Martin specification
WSS M2C913-A/B is preferred. Where this is not possible, oil
meeting the following standards may be used.
Authority Standard
API SL / SJ / EC / CF
ACEA A3 / B3 / B4
ILSAC GF3
13.13