Talking about lubricant oil, I have a problem with Shell for my previous car.
There is some sabotage happen in shell. The lubricant oil i receive is in purple colour. And the viscosity of the oil at 100C is out of specification. The lubricant are send to Shell Malaysia for analysis and Shell Malaysia did another detail investigation in UK. There still no result till now. Is about 6 month gone and I still waiting for the result.
But I'm lucky that this is not happen to my UDM. The engine noice lever increse even after a few oil change. I will make a forum and show the detail to all the members. Be carefull when oil change, check the oil before pouring in to your UDM.