Had a few of those. I would try Dawn first,and then the vinegar. When I was in grade school ,there was a kid in my class who brought some models into class,and they smelled like that. I wondered what their hose was like...
I always thought that truck looked hot.
So does yours!
Around 1977,I had a Datsun 620 pickup that I had painted black.
I put gold tape striping on it and painted the white spoke wheels antique gold.
I got several compliments on it.