We drive a 2011 Mazda CX-7 AWD Turbo and have had the ongoing problem of gas leaking into the oil. The hp fuel pump has been changed numerous times, the injectors twice. It always seems repaired after each servicing, however, we drive it a few hundered km's and the problem starts all over again. Servicing has always been performed at our local Mazda dealership and we always use Supreme Gas, not regular. So much gas is leaking into the oil that at last check it was 1/2" over the full line. Has anyone else had this problem?