I have just recently noticed a oil smell while I'm stuck in traffic with my foot on the brake in D but when I put it in N it seems to go away. It seems to have started after i got the S Tronic box serviced. When I went to take of earlier the car also stuttered and i could hear a rattling sound. It's only done it the one time and I cant recreate it. I'm thinking it's something to do with leaking when under pressure while sitting with my foot on the brake in D and now the gearbox may be a bit low on oil. Has anyone came across this before?