Automatic coupe 2004. Engine noise recently started sounding deeper, louder especially when I let go of the accelerator. It sounds as if it was down shifting. At first I thought it was the new tires but it is too loud.

Another possibility is that for the most recent oil change I used 5W 40 since I drive 500 miles + per week and I heard here in a forum it is recommended. Before that I only used 0W 30 (I think)

If it is due to the oil I guess it's ok, but I'm concerned it could be something bad.

Any thoughts are appreciated!

 

The manual recommends 0W40. Did you put in 8.5 quarts?

 

Zeracer thanks for replying!

I used 0W-40 up until the most recent change. I used 5W-40 Turbo Diesel only because I read somewhere here about a chart that has all types of oils acceptable for a Crossfire. Apparently 5W-40 is recommended for heavy driving.

Is this not true?

In regards to the oil quantity, I did use 8 1/2 quarts.

 

Are you sure it's not bad wheel bearing?

 

robby, you must know a bit about mechanic...

I recently had new tires put it and balancing of course. But the mechanic didn't do the aligning since he diagnosed the following:

Lower ball joints $95 each
Upper control arm $45 each
front shocks $95 each
Rear shocks $85 each
Left front wheel bearing $27

Parts $567
Labor $506
Total $1,073


At least I know what's causing the noise now!

 

You should get the ball joints, upper control arm and bearing fixed asap if you need them. If one of them break you could end up having an accident.

 

Jeez, that sure is a lot to go out at the same time.