Need Help - Just Bought CX7 and I notice engine noise at lower gears

[im180]

I just purchased a used 2008 CX7 with 16,000 miles.

I've had a loaner one for the past two days. Today when I picked up the one I was purchasing, I noticed a little different engine noise when I accelerated. It's difficult to describe, but it sounds kinda like a diesel engine rattle at lower gears. I asked the car salesman and he explained that it was probably because of the fresh oil change. Is that a plausible explanation? It only makes the sound through 1-3 gear then its gone.

What should I do? I just drove it off the lot and now I'm thinking I should have waited and gotten a better answer from a service mechanic or not taken the vehicle until they fixed the sound.

Any help would be appreciated.

 

[TheMAN]

they probably put crappy gas in it and the engine is pinging

stay off boost for now and fill it up with premium later

 

[erhayes]

+1 get some 93 octane in it ASAP

 

[im180]

Thanks for your replies.

Is the oil change explanation even plausible?

Another question - the finance guy was trying to sell me the Mazda Total Care Extended Warranty 5 year/75,000 mile for $1,695. I thought that was too much for a warranty, is it worth it? Now that I'm hearing things, maybe I should throw down the extra $30 a month.

 

[SeCX-9]

Thanks for your replies.

Is the oil change explanation even plausible?

Another question - the finance guy was trying to sell me the Mazda Total Care Extended Warranty 5 year/75,000 mile for $1,695. I thought that was too much for a warranty, is it worth it? Now that I'm hearing things, maybe I should throw down the extra $30 a month.

I just bought a 2008 CX-7 AWD GT last Friday and purchased the Mazda EasyCare Extended warranty. I paid $1888 for 120 months/100K miles with a $500 deductible.

 

[erhayes]

No. An oil change is not responsible for your noise. Mazda & Ford have the same warranty. Check with the Ford/Mazda site to get the "suggested" price and bargan down from there. I have no personal experience with Ford/Mazda prices but, I understand that there is often close to 100% makeup so there maybe lots of bargaining room. Ed