GL1 rating is no longer enforced so anyone can call their oil GL1. I still have to use GL1 in my bulldozer because GL5 will plug up the wet steering brake bands. I use 40 weight non-detergent motor oil which is the same thing as the old SAE 90W GL-1.
I have a Ford 641 and have used GL5 90W oil in it for many years. NO yellow metal in the Ford that I know of, plus many GL5 oils are now yellow metal safe anyway.
Now adays - GL5 is NOT good to use in synchromesh transmissions. Again, no problem with your Ford.
303 oil is only 20 weight viscosity and I'd rather have the GL5 90W which is 30 weight viscosity. Plus the GL5 gives better metal wear protection.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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