Sounds like you answered your own questions on the napa oil. Cheap oil can be as good as "premium" oil but it is unlikely. Need the get the spec sheets from the manufacturer to really know what's in it. Look for the TBN number. the higher the better. Good synthetics are in the 10-12ish TBN range.
Dexron is a GM name for transmission fluid. Mercon is the Ford name. (ATP+4 is Chryslers) Each has certain specs for GM and Ford transmissions. The older Deron and Mercon were about the same so some labels list both.
the newer transmissions take a light viscosity fluid that may not be as interchangeable as the old ones. so beware on newer cars/trucks. i would only get the flavor it specifies. not worth a new transmission.
our newest 2 cars don't even have a transmission dipstick. you have to take it to the dealer at $40 to have them check it. The factory doesn't want to take any chances of someone putting the wrong fluid it (a big problem for Chrysler 4spd trans in the mid-1990's. seems silly that they'd rather not have the wrong oil than to have it run low.
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Today's Featured Article - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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