I just bought a Huber Warco 4D grader, and it has what I'm pretty sure is a DD 4-53. It's old and thrashed, but the only thing it obviously needs is an oil change. I have a bunch of Rotella 15W-40, and some Delo 15W-40. Is either of them suitable for this old iron?

This bent shank type is great for sticking in a hip pocket. They used to come with computers we sold 30+ years ago, and everyone in the shop had a few. Can't find'em anywhere now.

I have several, but the ones I will hang onto are these.  In 72' I was working in the local Ford garage.  My father came in one afternoon, handed me a sack, "think  you will need these".   I was a little astonished as he was never one to part with a dollar unless necessary.  He had bought brand new 2 ball peen hammers,  a 12 oz. And 16 oz. Both stamped Coast to Coast stores.  Some wrenches were in there too.  The heads still have little traces of the blue paint that long vanished store chain used.  There is a little 6 oz. ball peen I rather cherish.  It has Craftsman in an oval on the head, it has been here on the farm since my folks came here in 1947.  Jobs were scarce in Chicago when the defense plants closed, the decision was made to sell out, buy a farm in Nebraska, my uncles chipped to buy a new set of Craftsman tool to take with them.  Most of them have survived near 75 years use on this farm.

I have seen those before, K20 also offers a skinny pen sized style.

The way I see it a lot of the pliers were as cheap if not cheaper than many inferior quality imported options available today.