Lucas gearbox oil is the best lube for your gearbox! Mowpart has Lucas synthetic and conventional gear lubricant. Lucas 75w-90 and 80w-90 are excellent for gearbox lubrication! Lucas gear oil lubricant is a step above normal gear oils with its special anti-wear agents and other lubrication agents that control wear, drag, and heat. Save with Flat rate shipping starting at $7.95, most orders ship same day!