Hey Mike,

That is a dual rated oil.

C=Compression ignition , or diesel
(I'm going to have to guess the "T" is really E/F/G/J/K)

SM=S=Spark ignition or gasoline

So: It says right on the bottle it is approved for SM gas applications.
SM was introduced in the mid-2000s and ended about 2010 or 2011.

I bet the truck was originally delivered with an SM spec oil.

The grade is a little thick and that's where the judgement call comes
in, but it will probably be fine. Engine might seem a little quieter and
fuel economy might suffer slightly.

Shelf life is a controversial thing. The oil companies usually say 1 year but oil on a store
shelf is often considerably older than that. Beware of any that was stored in an environment
with large temperature swings, inspect by shaking well and pouring in a clear container first.
Additive dropout will result in chunks at the bottom......moisture contamination
will show up as cloudy product.

Bobistheoilguy.com is a good place to ask this question, in terms of the
quality of answers you will receive.