That is a lovely old truck and must have been the hillbilly Cadillac of its day with all of that chrome trim. Clearly not the tradesman version.
Since you have the 15W-40 on hand, use it. It'll work well.
The main reason that straight grades would have been recommended new was that no multi grades existed.
OTOH, for a good weather occasional driver, there'd be nothing wrong with using an SAE 30.
We have a couple of members here who've recently run this grade in modern daily drivers with good results.
Since you have the 15W-40 on hand, use it. It'll work well.
The main reason that straight grades would have been recommended new was that no multi grades existed.
OTOH, for a good weather occasional driver, there'd be nothing wrong with using an SAE 30.
We have a couple of members here who've recently run this grade in modern daily drivers with good results.