I use 030 in mine , but it will also use 035. A buddy of mine has the same machine and loves the 035.

Ive welded up to 5/16 mild steel, exhaust pipe ,1/16 and body metal on an S10 truck. All with 030 👍👍

My welder is a fluxcore Titanium 125.

1962 C10 with a 235 6cyl -- all of the drive train seems to be original.
Some of this story is in the Side Lot
Some people like a new truck. I liked the old ones.