Does the model have opening parts and detailed features?

Yes. It has opening hood and doors, steerable wheels, real rubber tires, and detailed interior, exterior, and engine compartment.

What scale is the 1968 Oldsmobile Holiday Coupe 442 diecast model?

It is a 1:18 scale die-cast model.

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Round 2 American Muscle 1968 Oldsmobile Holiday Coupe 442 Hemmings Muscle Machines - Code F Teal Frost 1/18 Scale Diecast - AMM1350/06

1:18 scale die-cast 1968 Oldsmobile Holiday Coupe 442 in Code F Teal Frost, part of the Hemmings Muscle Machines line
A collectible for muscle car and diecast enthusiasts