As form often follows function,consider the original intent of the forend cap was to seal off the end grain to prevent moisture from wicking into the forend.
I cannot recall the name of the outfit,but there is a dealer in knife making supplies that sells small blocks of exotic woods and also micarta and impregnated woods.
Not intending to criticize your motoroil idea,but please consider traditional oil finishes harden .I think the motor oil will not,and will just oil soak the wood.
I have used leather die on wood,even once used india ink to stain a very plain stock,then sanded it to leave the pores black.It looked pretty good.But,India ink is not waterproof.
Anyway,good luck!!!
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