Hi folks. Car is a 265hp 2011 e350 cdi, 85k miles. Noticed on and off for months the odd whiff of diesel on 1st starting the car that would settle very quickly and not come back sometimes for a few days. Only now just got round to looking it up and sounds very much like an injector seal issue. Checked under the engine and can see some light oily residue on the right hand bank under all the gubbins that hides the injectors. I can see a seal kit is dead cheap but, assuming the injectors come out ok, how much of a job is it for a keen DIY have a go mechanic. I've changed injextors before on an Volvo V70, they just popped straight out no bother. Probably worth getting a price from the Indy garage I've used before but wondered if anyone on here had done it and how tricky it was. Thanks.