Royal Purple XPR Extreme Performance Racing Synthetic Motor Oil - 20W50 - 5 Gallons 56-1421 and has built in reverse

and has built in reverse polarity protection

0-100 Points

GM Fullsize Truck 1973-80

4-Bar MAP Sensor

Duration 266 / 270

Royal Purple XPR Extreme Performance Racing Synthetic Motor Oil - 20W50 - 5 Gallons 56-1421 and has built in reverseRoyal Purple(R) XPR Extreme Performance Racing oils are formulated for demanding applications such as racing, modified engines and off road use. XPR's high film strength make it exceptionally well suited for today's high performance cars and trucks, particularly turbo and supercharged engines and or engines using a nitrous boost. Royal Purple(R)XPR produces winning results on the race track and is safe enough to use in your daily commuter car.