Hello, was today with the car (DS3 blue hdi) in a previously unknown free workshop for oil change with filter after telephone offer. Workshop and shop neatly, make Karrosserie, workshop, oldtimer restoration. All nice people, good rating on the net. When paying I notice that there is then on the bill „Pauschaloffer oil change”, and a line under “Synthetic oil 5W-30. My car gets 0W-30 after PSA something. She only had this one description in the system if she chose the package offer. I was then somewhat unsure about where she then sent your colleague to the workshop to get information. Then she told us that although on the bill whatever might appear, the mechanic would fill in the oil according to the manufacturer’s specification for the car that comes into the hall. So. Now I can believe that one just doesn’t “punch offer” to choose for each Viscosity and release in his billing program. But only one thing. Or can tell me that I’m driving around with the wrong oil. I’ll never find out. What can happen if I actually get 5W-30 instead of 0W-30? From the viscosity it may not matter, but what about ash content, HTHS values etc…? Possible effects? Greetings,