Reading various reports with interest....my SL500 (2011) has been super reliable, only covered 40k miles. Just replaced all front and rear bushes, well worth it but I'm afraid the old rust worm is attacking. The usual wheel arch inner lip, leading edge of spare wheel well (external), then I removed rear plastic cover, blisters everywhere, decided to remove all under trays, much the same, nothing serious but will be in a year or two. Rear exhaust hangers rusty and also seams behind rear wheel arch liners (up top). So.....blew the dust off the old DA ....poor show for such low miles, especially as she is in dehumidified garage from Oct till march each year.....I still love my SL though!