Tried AMSOIL's Engine and Transmission Flush.....

[MGPD03]

Long story short I just picked up a 2007 Chevrolet Silverado (GMT900) 2WD/5.3/4L60E with 86k miles. Seller did not have any service records nor information on the two previous owners, but a CarFax report indicated that the first 56k miles were put on in the first five months....wow.

I decided to flush the transmission and drop the pan/filter because the shifts were a bit "sloppy"...1-2 in particular.

Anyhow I got to crawling around under the pickup and noticed that the rear differential cover and the transmission pan looked to be untouched from the factory (blue paint still on the differential fill plug). So, I grabbed one of the site regulars ZO#'s and proceeded to pick up a small fortune worth of fluid. Then to the parts store for filter and gaskets.

Parked the truck in my shop, dumped in the engine and transmission flush, and proceeded as per the directions. Now, before I started I checked the fluid level and it was nice and clean on the dipstick (wondered at that point "Why?" but I had the time, fluid, and beer so....did it anyway). Anyhow ran the 15 minutes, then disassembled the front end of my truck to get to the cooler return line to screw in my barb and hose, and started the flush.

I flushed the transmission with a case of cheapo Dex VI and then 4 quarts of AMSOIL just because I could. The fluid went from red to black (for about 12 quarts) then back to red. I'm not quite sure how much the AMSOIL Engine and Transmission flush did, but I've never seen fluid that dark before...

After flushing out the flush (is that an oxymoron?) I pumped out another 2.5 quarts to reduce the mess when I dropped the pan. Dropping the pan and pulling the filter revealed a gunked up filter (preexisting or flush related?). Everything I could see was as clean as a whistle....wish I could see the clutches....

Installed new filter, slapped the pan back on, and added 2.5 quarts of AMSOIL so I could finish the flush. Went back to the cooler line and finished up with my remaining 10 quarts. Fluid looked great so I wrapped it up and put it back together.

Test drive showed 1-2 to be velvety smooth and it even seems as if R-N-D engagement is much quicker and smooth. Possible placebo effect, but my wife drove it to the store and noticed....so?

Wish I would have taken pictures, but I was covered in all manner of fluid...

Moral of the story: AMSOIL Engine and Transmission flush will not cause California to say F.U., separate from the contiguous United States, and join with Hawaii.

 

[charbaby]

Good story! Very specific in your details and I in particular don't need to see pictures as Im familier with what you are talking about. I beleive that you did the right thing(to the letter) and now it's time to just do regular maintenance from here on and I beleive the truck will give you great service. Maybe I missed something but, are you going to drain/refill the differential? Im sure you are!

 

[Hethaerto]

I love Amsoil products.

 

[Steve S]

California will say that ...... I live there.

 

[mechtech2]

What was in the pan was loosened up and got in the filter.
You are lucky you did not cause any damage.

 

[MGPD03]

Originally Posted By: Char Baby
Maybe I missed something but, are you going to drain/refill the differential?


Yes, did get that done as well....made the mistake of leaving the truck windows down in the enclosed shop....now my interior stinks of sulphur. Good times.

Originally Posted By: mechtech2
What was in the pan was loosened up and got in the filter.
You are lucky you did not cause any damage.


Always a devil's advocate, eh? I guess that's why they make no qualms about a filter change being a necessity.

 

[KevinG]

Sorry to revive a thread that has been dead for several years, but I am glad that I found it.

I just bought an 07 Yucon Denali with 120,000 miles on it. The transmission fluid is brown, and it doesn't look like it's ever been changed. It drives and shifts smooth as silk though.

I ordered the transmission flush, a case of Amsoil transmission fluid, and got a new filter, but I was worried about running the flush, changing the filter, and using the transmission cooler lines to change the rest of the fluid. I was worried about the old fluid with the flush in it running through the new filter as I am using the cooler lines to replace the rest of the fluid.

Now I think I am going to use this procedure. Run the flush, then flush out the flush and old fluid out with a cheapo fluid, then replace the filter, and then chase the cheapo fluid with an Amsoil fluid backer. That way I will have all new Amsoil fluid with a new clean filter.

MGPD03 are you still around? How did your transmission run long term now that it's 4 years later?

 

[Ken2]

I wouldn't do anything that drastic. I'd just do a drain, filter renewal, maybe put a drain plug into the pan, and refill. Drive. Drain & refill again. And again. An in-line Magnefine or Filtran filter is always wise.

The solvent flush products have the risk of loosening a bit of glop that then plugs up a tiny passage. Now you have a real problem.

I feel that the main purpose of the engine flush is to dilute the old oil so it drains better and the new Amsoil looks cleaner longer. I've used a transmission flush solvent in a low mileage transmission with sticky valves due to lack of use. It worked, but I'd be leery of doing that in a high mileage transmission.

 

[MolaKule]

A gentle cleaning with multiple pan drain and refills is best for any transmission.

I'm with Ken2, I would not use a flush in the transmission.

 

[artificialist]

At the repair shops I worked at, all cars were given a can of transmission flush fluid before being hooked up the the transmission machine. It never was a problem.

 

[JustinH]

Just had a BG transmission flush done on the matrix.

Great service, a little pricey but I think worth it.

 

[barkingspider]

There's no need for a transmission flush on an 07 Denali or any 07. Like posted above, replace the transmission filter, drain and refill with fresh Dex 6

 

[MolaKule]

Originally Posted By: artificialist
At the repair shops I worked at, all cars were given a can of transmission flush fluid before being hooked up the the transmission machine. It never was a problem.


For the good of the transmission or for the good of the transmission shops bottom line?