I've been driving this truck all over the property since I got it running.. with the same 20 year old oil that was in it when I got it, and probably a good amount of WD40 in the oil from lubricating the valves and rockers and cylinders.

It runs like a champ, and a few days ago it struck me.. "Hey dude! You never changed the oil! You better do that!"

I know the original specs for these old engines call for something like straight 20 (i found that out after putting 5W 30 in the '46)

I got 6 quarts of that Valvoline 5W 20 and i'll be putting that in today.

an idea is only stupid if you think about it rationally.