Dave,
I have a '56 235 and it takes 6 quarts (including one for the oil filter
canister). You should replace the filter, most vendors carry replacements.
Measure your canister as there are slight variations among the one's I have
seen.
I have used a Fram C4P available at Kragens. There was a recent post with all
the variations available, check the archives. Bob Adler an AD expert
restorer recommends 10-30 SJ (API) oil, I have found Quaker State has a product.
Dave
49 GMC
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