The Boat Grotto in College Area operates a 10,000-square-foot marine repair center at 7111 El Cajon Boulevard, San Diego 92115, founded in 1999 by owner Leonard Trani and managed by Mario Trani. The facility holds Platinum Mercury Marine dealer status and carries authorized warranty-repair designations for MerCruiser sterndrives, MerCruiser CMD Zeus pod drives, Mercury outboards including Verado four-strokes, Mercury Racing, and Yamaha outboard service — a dealer-authorization stack that covers the propulsion systems on most San Diego recreational and performance vessels. Trailerable boat service at the El Cajon Boulevard shop handles outboard lower-unit rebuilds, sterndrive gimbal-bearing replacement, engine winterization, impeller swaps, fuel-system cleaning, and complete powerplant rebuilds in a parts room stocked with OEM Mercury and aftermarket components. The shop also sells portable Mercury four-stroke outboards starting at 995 dollars and stocks inflatable tenders, and trailered vessels arriving from dealer lots — including trucks and SUVs purchased through M & M Auto Warehouse in College Area — bring the tow rig straight to the Grotto for outboard service and trailer-brake wiring before the first launch. Dockside repair trucks run mobile service to Shelter Island, Harbor Island, Coronado, Mission Bay, South Bay, and National City marinas, handling engine diagnosis, impeller replacement, raw-water system flushing, bilge-pump installation, and electronics troubleshooting on vessels from 17 feet to over 100 feet. High-performance marine work covers supercharger installation, racing outdrive service, performance exhaust systems, blower kits, power-steering conversions, and engine enhancements on go-fast hulls where horsepower output exceeds factory specification. The BBB A+ profile and USCG-credentialed captains on staff anchor the qualifications that separates a full-service marine center from a general mechanic who dabbles in boat work. Tow-vehicle operators refuel at Sinclair Gas Station on Mission Gorge Road after hauling loaded trailers through the Grantville corridor, where the intersection of Mission Gorge and El Cajon Boulevard connects the marine service center to the 8 freeway. The 92115 ZIP places the shop on the eastern reach of El Cajon Blvd near the La Mesa border, and the College Area address gives boaters a central San Diego staging point that avoids marina labor surcharges and dockside access fees for trailerable work.