[bwestZ71]

My wife bought a 2005 CTS last year with only 28K on it and found out that it uses a quart of oil in 1000 -1200 miles and we where told that's normal usage. I've never owned a newish vehicle in which any usage was normal let alone noticable. We found this out when the low oil sensor wouldn't allow us to start it up once, it was down too low and we had the car towed. I was also under the belief that with synthetic oil we could go 5000 miles between oil changes , now if I'm wrong I'd like to know, but everyone I've talked to outside the dealership I bought the car from says between 5000 and 7000 miles using the recommended Mobil 10W30, we have the major extended service plan on this car for another 45K miles and the dealer will not even entertain seeing what could be done to stop it from useing the oil up so fast . Another ASME certified master mechanic friend of mine said there's been problems with these engine forever and it needs to be replaced.
What do you think