Hello, Pretty new to the board, just learing about motor oil, synthtics, etc. I plan on going on a long trip (round trip 6000 miles) with my 89 toyota truck, 4x4,76k, ext cab, w/ 3.0 v6 and auto trans, towing a fairly heavy load for the truck (3500-4000 lbs) I currently have a transmission oil cooler, in line with the factory oil cooler. I flushed the existing transmission oil (pumped out all of the old, and replaced it with 11 or so new qts) w/ reg dino trans fluid before I leave, I'm going to have the current oil anilyzed by a lab, to be sure everything is in good working order. the oil presently looks clean, for having 2800 miles on it, and the truck uses hardly any oil the oil in the truck presently is reg oil, as supplied by the dealer. (I usually do my own oil changes, but it's been so **** cold here, I just paid the price, and had it done.) now the questions I have are- A) any benefit now of flushing the transmission fluid again, and replacing it with synthetic? B) should I stick with the Dino oil, or switch to Synthetic? (the truck is going to be working hard the whole way) C) which grade oil should I use for the trip? (remember the truck is going to be working hard- mountainous terrain, heavy loads, high revs when in the mountains, etc)- Im leaving Buffalo NY, and will arrive in Las Vegas, Nevada D)I've been using factory toyota filters- anything any better for my truck? E) should I change the oil when I get there, or should I just push on through, w/o the oil change? thanks so much for any and all advice, I'm leaving feb 9th, and my truck is my baby.. I want her to last as long as possible. Percy.