I have a 2007 Mazda 6 with the 3.0 V6 and currently about 65000 miles that we bought brand new. I religiously change the oil in 4000 mile intervals, despite the recommened 5k interval listed in the manual (we are in Minnesota, and it mainly drives the wife to work everyday – shorter trips of city driving).
A few months ago, it started using more oil between changes. It went from using none between changes to burning about a quart every 1500 miles. There has to be something wrong. I have spoken to the dealer service dept about this (since we have a Mazda extended warranty, any warranty work will need to be done at a dealer), and they say it is within the acceptable range of oil use on this vehicle and I should bring it back every 1000 miles to record the usage levels. I asked that they change the PCV valve, and they said that it doesn’t have a standard PCV, but a larger, more expensive tube that wouldn’t have failed.
My concern, while I do regularly check my oil, is that between changes I’m using 2.5 quarts of oil. I’ve driven older vehicles with 3 times the miles as this one and have never gone through oil like this. Where is it going? Is that acceptable amount to do nothing about? Any thoughts would be appreciated… I want this car to last a long time, and since it’s still under some warranty coverage I’d like to know sooner than later if there might be a major repair in my future.
Thanks in advance for your comments/suggestions. MN_Jeff