Originally Posted By: MaximaGuy
Originally Posted By: ledslinger
Tom, I have a babied 2003 Chevy Silverado, with a 4.8 and a 4L6O transmission. At 25K miles I did a pan drain, and a cooling line flush with the Mobil version of Transynd. Exchanging about a total of 12 quarts until the fluid changed color. I plan on doing a similar cooling line exchange at 50K and am debating between my stock of Mobil TES 295, or Delco Dexron VI. The original fluid spec in 2003 was Dexron III.
Which should I choose for my next change and why? Thanks
No offense meant you are already driving a beast from a GW stdpt -- it would make no sense to go thinner and the real gain in MPG would be unnoticeable. If you are old school keep doing what you are doing on a regular basis than putting in Dex-VI with longer exchange intervals. IMO, there is nothing wrong w/ DexIII other that it is no longer licensed -- there are more transmissions out there running on DexIII than DexVi.
Rumor has it that Valvoline's current "Dex/Merc" is still the same formulation as their previously GM Certified DexIII. Does anyone know one way or another?
I just used some today to do a drain and fill on a 440-T4 in and old Pontiac so I'm curious.