And puckpuck, i bet you are right...but I can guarantee, what woks on big block engines will not work the same on smaller engines. Running Mobil 1 Trisynthetic oil will prolong the engines life, and keep it nice and clean inside. Things you need to watch out for is:
Every car is affected differently in every way (common sense). But let's take BMW for a moment. They use BMW High Performance Synthetic oil...can I tell you a secret...after working for a BWM dealer for a while, I found out it was just Castro Synthetic oil. Well, to tell you all another secret, castrol synthetic oil is not a real synthetic oil, but a mineral based oil. Also, it has high ash deposits. Well on BMW's the oil works great, actually better than great, but on my previous car, my ford probe, after I ran Castrom Syntec for 2000 miles, well at the time I changed to mobil 1 trisynthetic, the castrol was black, and grainy (filled with ash). I was afraid i killed my engine. It's the same with fuel and oil additives. Check with ford, and see which additives have been found to work. The reason I like techron is, it has been proven to be safe on all gasoline engine cars. Chevron Gas stations (none where I live) gasoline all contain techron. Smaller amounts of it than you'd add, and in a slightly weaker form, but nonetheless it is techron. It's a synthetic detergent that just helps the gasoline flow better through the pipes, injectors, and helps clesn up stuff on the way by dissolving it.
I usually stay away from additives, and just use the best fluids I can find, such a Mobil 1 Trisynthetic motor oil, 93 octane gas, etc... The only additives I will add is Techron every 3000-5000 miles, and Red Line Synthetic Water Wetter to my radiator resevoir. It'll keep your engine much much cooler...it's osme good stuff.