Rockwell 503 belt sander oil...

[Joe Kieve]

I stopped by 3 auto parts stores today trying to find straight 90 wt. gear oil for my Rockwell 503 belt sander. None of them carried any and said the multi-grades 75w-90 or 80w-90 should work so long as it conformed to GL5 standard. I'm leaning toward "Castrol Hypoy C 80w-90".

I certainly don't want to put something in that's going to destroy my sander.

What do you think?

Thanks in advance for your advice or suggestions.

Joe

[Dale Cruea]

90 wt. oil is what they used to use in rear axles I think.
They may not anymore, it has been awhile since I worked on cars.
Try a full service gas station or someplace that does oil changes.