Man, I'm doing some goofy shit today (I know, I know... what makes today so different?)
I was considering a reply about the warning not to mix Mercon/Dexron3 (isn't everyone glad we aren't calling it "DexTron"?) and Mercon V while some suppliers are marketting a "dual" rating ATF... Is there a chance that the engineers may reverse their stance on these oils? Well, they did an about face on what oil to use in the C6 way back in the 70s..... this year they did an about face on what oils could be used in the 4R100 (with the admonishment that we should never mix the two).... and we even have to add "secret sauce" to some 5R55 transmissions. There remains the chance that another about face may be in the works....or not....
FWIW, being a dealership tech, it is prudent for me to use only those lubes that the factory approves.... if anything happens that involves a lawyer, it becomes essential that I have followed manufacturer recommendations to a "T". In the FWIW department, it is the chance of consumer litigation that drives repair costs up....
The little guy working out of a rented bay has little to fear because he has little to lose (certainly not enough to hire a lawyer over) or can pack up and leave in a heartbeat. We have over a million in inventory, over twenty employees and plan on being around for a long, long time..... Where do you think the bullseye gets painted???
Wow... now THAT was a digression....