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Discussion Starter · #1 ·
My 03 automatic is coming up on the 100,000 mile mark, and I was wondering what maintenance I should be performing. I haven't had any enigine or drivetrain problems so far, but I want to be proactive.
 

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2004 3.6 auto
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140 Posts
Just my opinion, but I'd replace the diff fluid every 50k miles. No reason to give these rear ends more reason to howl louder than they already do!

You may want to replace your Dexcool or give some thought to replacing it with the green stuff. If you go green, you'll need to do an excellent job of flushing out the Dexcool though. This is a heated topic so others may chime in on the coolant issue. I'm still not sure what I'm going to do in this regard.

Good Luck.
 

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06 CTS-V
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2,501 Posts
not when he's doing plugs and a timing belt, might as well do it while the engine is apart, if you do the tstat might as well do the temp sensor too. then if your doing timing belt, might as well do the water pump and idler pulleys. serpentine i'd only do it if it needs it.
 

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2014 SRX AWD Platinum Ice/2010 CTS Sedan 3.6 AWD Silver
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644 Posts
I would wiat till you had the symtoms before replacing parts, especially the t-stat, that's about an 8 hour job.
I disagree on the CPS. These things can leave you stranded with a car that won't start and you don't always get any symptoms beforehand. We've had a lot of '03 owners report them failing around 80-100k. I wouldn't take a chance - I'd change it, especially since it is relatively inexpensive repair.

-GT
 
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