Probably better than what was made when the dozers was new. Look closely at the bucket at the store, there is a "Heavy duty" 30 wt oil they sell that's not diesel engine rated. You don't want that!
The age of your D6B plus your climate, I would go for SAE 40 WT. if they have it. We run 40 WT. AND 2 quarts of Lucas oil treatment our 1960 D6B in Texas. My brother is the second owner of this machine and we know the engine has never been overhauled!
Craig
change it often if you do as the traveller house brand is economy at best
It's a good flush out oil
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