The Truck should cover med/heavy oil pretty well. I wouldn't think a pearl resin ball would handle any more oil than your Truck, so I'd stay away from the SS Pearl and X-Factor. A strong solid shell resin or light/med load particle sounds like what you want.
Raging Inferno, Full Throttle, Anomaly, Black Cherry Bomb, Mayhem, Silver Streak Particle, Duece, Super Charge, Phenom Unleashed, Burgandy Gryphon...
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Penn State Proud