I dont mark any of my bits, simply because I always service my friends & families vehicles myself. However, if you go to a main dealer I certainly would do it. My friend took his Vauxhall in for a service last year and handed over £140 for a service. He then bought it to me a week later so I could change his brake pads for him. I checked his oil & it was black. So was the air filter & pollen filter. Personally I dont even think they had opened the bonnet on the car. My friend rang up and had a go at them and they insisted that they had changed the oil + filter but that it must have been a mechanics mistake that he hadnt changed the pollen filter & air filter & they would do it for him then & there. Anyhow, he learnt his lesson and next time will bring it to me for his service - that way you know exactly what bits you have changed and what oil etc. you have put in it. Ive actually just done a full major service on my 996. Oil, Oil Filter, Fuel Filter, belts, spark plugs, air filters, brake pads, brake fluid change & now just have the chain/sprockets to do. Wasnt cheap, but means for the same price as ducati labour, i can change everything rather than just the oil + filter.
