Hi just wanted to ask some advice. I have a CLK 320 which has just been serviced at Brentford main dealer. They mentioned i have an oil leak on rocker cover. Have had the car from new and has main dealer service history. have been renewing merc warranty every year after 3 years manufacturers ran out and they tell me its not covered even though i have warranty Seems quite strange as it a tier 1 warranty which is the top and is supposed to cover virtually everything?? Please advise if this makes sense???