Fair enough . What , may I ask , is your Oil Change Interval ? That can have a big influence on the outcome .
Also , consider , to my knowledge , all Dexos 1 Gen1 is at least synthetic blend ( if not full synthetic ) . Not sure about Gen2 ?
I have the impression , synthetic oil is better at cleaning & keeping the inside of the engine clean ? And flows better on start up ?
On engines that use engine oil to operate cam phases , I want as good a cleaning action as I can reasonable get . That sounds like an expensive repair , if the oil passages ( small ? ) plug up ?
I do not have a turbo engine or Direct Gas Injection , nor do I want one . But if I did , I would probably go to Gen 2 .
All this is concerning the Sonic 1.8l . The Buick 3.8l & the caprice 5.0l do not call for Dexos and get name brand conventional oil .
I try to buy oil / filters on sale .
Thanks ,
