1 QUART 75W-90 BG ULTRAGUARD FULL SYNTHETIC GEAR BOX REAR DIFFERENTIAL FLUID. BG Ultra-Guard® Full Synthetic Gear Lubricant is full synthetic API GL-5 rated gear lubricant blended to SAE 75W-90 viscosity. BG Ultra-Guard provides the ultimate protection for driveline components. It is formulated for maintaining system cleanliness, increased thermal stability, improved seal performance, quieter operation, and unsurpassed protection against wear, pitting, and corrosion.
