Delighted w/AMSOIL ATF in a GM 4L60E Hydromatic

[outrun]

Here are the parameters. Tran was run for the past 60k on Mobil 1 Synthetic ATF (2005 bottled vintage). The pan was dropped, new filter installed, and a T-Tech fluid exchanger cycled in the M1. Total M1 used was 3-gallons. Under quick acceleration the shifts became very sloppy, or slippery I was say. I added 2 bottles of Lucas ATF additive which somehow corrected this. My guess is the Lucas friction modified the M1, also it caused firmer 1-2 shifts in the cold. Over the last few months the transmission also started to shutter during some gear changes like R to OD. The biard here recently mentioned this is a sign of ATF aging/failure so I decided on service time.

On Amsoil, the same pan & filter service was done,a long with a BG Fluid service. I used 1-case of Amsoil ATF. The shop did put in some kind of BG additive bottle. I do not mind this too much, but would have prefered straight Amsoil.

Observations: The shifts are smooth and great!

Other notes: Pablo's recent post giving us clues on the sophisticated new Amsoil formula (and base oil composition) make me feel like a got a wonderful product for the money.[compared to M1 possibly being GroupIII and Redline being a tad bit more costly]

So thanks Amsoil & you guys are pushing me towards defecting to yall due to my budding mistrust in Mobil1's PCMO base group switcharoo.

 

[Pablo]

Some people have said Amsoil ATF and M1 ATF are the same! I get a kick out of that. Years ago a fellow Amsoil dealer used to do a hot burner flame test with M1 and Amsoil ATF.....not that the test meant anything in real life, but the ease at which the M1 flamed, the way it burned, the burn residue.....one could easily tell the fluids are different.

I have neighbors with GM rigs used for pulling trailers over the passes that just smoked any ATF they tried. I get them a case of ATF for change out. ATF looks the same as it went in the next year and the year after.

I do the catalog thing from time to time in the 'hood, pretty embarrassing - not too much oil bought in the 'hood - but ATF and gear oil seem to do OK. And the famous knock on the door....

Anyway I appreciate the future business.