After reading the wealth of information posted by all the members of this board over the last several months; I have compiled a list of oils that I believe would fit the bill for all cars and light trucks on the planet. I don't expect you guys to agree with my selection, but let me know what you think of this list: 1. Motorcraft 5W-20 synthetic blend for Ford & Honda. 2. Castrol 5W-30 conventional for breaking in new engines except Ford & Honda. 3. German Castrol 0W-30 for all gasoline engines after break-in except Ford & Honda. 4. Chevron Delo 15W-40 for all diesel trucks and worn out gasoline engines. I have omitted 10W-30 because I think GC could take its place. What do you guys think? Write up your own list, but you can only choose 4 oils.