Hi Adil and welcome to the JAGUAR OWNERS CLUB. Being a XKR owner myself and having converted from a Mercedes SL55 AMG I honestly cannot say the running costs are any different. A set of brake pads from a main dealer will be pricey however there are many independent Jaguar specialists out there dependant on where you live who perform work at a reasonable cost, as for the parts then the likes of EBC Brakes, Euro Car Parts or GSF will supply pads, discs etc at a very competitive price. As for oil and filter changes then I don't have any personal problems with using the likes of National Tyres, Kwik Fit etc who perform such quite reasonable. My preference there would be National Tyres who use better quality oils, in fact on my last oil change they replenished with Castrol Magnatec which would have been my preference if I were to purchase they oil myself.