|14-12-2016, 12:03 PM||#16|
Join Date: Oct 2005
Location: Kingston upon Thames
Car: W212 E63 AMG Saloon
I'll see if I can find a reference, but this was based on vw.study on their own engines with an 18k oil change interval, if I recall. It may be counterintuitive, but it makes sense if the oil has greater long term stability in viscosity and lubricity and the oil change interval is optimised around the specification of the additives and how long they remain effective.
Last edited by AlexM; 14-12-2016 at 12:05 PM.