Just bought 2003 Z71 w/145,000 miles. Fluid change question...

[Bcox]

Bought a 2003 Z71 Tahoe. I don't know if the transmission fluid, transfer case fluid, differential fluids, etc have been changed or replaced. Should I go ahead and do this since it has 145,000 miles on it? Also do any of you recommend just going to a Valvoline to have this done??

Thank you

 

[quest51210]

But your supplies online and diy,

 

[David Paul]

But your supplies online and diy,

This, good way to learn your new ride.

 

[95escahoe]

I'd do all fluids, tranny, transfer case, front and rear diffs, power steering, if you can't do it yourself bring it to a shop skip Valvoline worst place you could bring it


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[rndsommer]

I did all mine at 110k. The transmission shop mechanic told me if the trans fluid didn't look good before the service he would recommend against it. I guess if the old fluid looks burnt and smells funny a fluid change might just speed up the eventual breakdown and cause customers to blame him and the shop. That being said I would do all the fluid changes.

 

[Denali2k8]

My new to me Denali is an 08 with 80k on the dash. At 100k I will be doing the whole rundown of fluids too. The previous owners seemed like they took care of it, but to ensure it runs another 100k, I will be doing it all. Trans, transfer case, front and rear diff, etc. Nothing wrong in some good insurance. Fluid change NOW is cheaper than replacing parts later.

 

[95escahoe]

I did all mine at 110k. The transmission shop mechanic told me if the trans fluid didn't look good before the service he would recommend against it. I guess if the old fluid looks burnt and smells funny a fluid change might just speed up the eventual breakdown and cause customers to blame him and the shop. That being said I would do all the fluid changes.

If that's the case on the trans just drop the pan, replace the filter and fluid and do no tranny flush


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[pcowner]

do you guys see any problems with the stock cooling liquid, w Dexcool, I see people blame/lawsuits this additive for internal problems, do you replace it?

 

[pcowner]

I called around to replace some liquids inmy 09 Tahoe 135k, it's about $500 parts and labor. I'm aiming for Amsoil, (at least in transmission).

 

[SnowDrifter]

do you guys see any problems with the stock cooling liquid, w Dexcool, I see people blame/lawsuits this additive for internal problems, do you replace it?

I did mine with Universal yellow. I'm disenchanted with dexcool.