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Hola To All
We all know that manufacturing of the parts is much better now than when an good De Soto was new on the lot. We also now know that Vehicle Oils used now are better than when the same vehicle was new on the lot.
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This is why any 10-30w is better for the engine that what was being sold when our vehicles were new on the lot. The same vehicle will
also use less fuel by having 10-30w.
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My question is when was the first MoPar Owner's Manual or MoPar Factory Service Manual ( aka FSM ) to have Multi Grade Oils listed as what to use ?
Rodger & Gabby
COS
FltSgt@outlook.com
Hola All
I just answered part of my question. Because of an hint by another I looked
at an 1956 De Soto FSM, a 1956 De Soto Owner's Manual and an 1956 Crashler
Owner's Manual. They all have Multi-Grade Motor Oil Informaton from 5-20W,
10-30W, and even 20-40W.
This means back up into 1954 so that all information can be edited correctly
several times before 1956 production which starts in 1955 and this could very
easy be 1952 or 1953 tech information.
Rodger & Gabby
COS
FltSgt@outlook.com
