I changed the oil in my 120 about 2 weeks ago now, from GM 5w-30 fully Synthetic and replaced it with what was recommended online, Mobil 1 Fully Synthetic Turbo Diesel ESP 0w-40 Dexos 2.
Since then the car sounds so loud and quite rough on start up and just doesnt seem to run as well as before... I'm probably being paranoid, but it feels like the engine knocks a little at idle?
The oil level is perfect, below max, when checked as per the instructions in the bonnet... wait 5 minutes blah blah etc
Should I just bit the bullet and change the oil AGAIN! LOL