Kirkland Signature gasoline at Costco Gas Station in La Mesa contains five times the EPA-mandated minimum detergent additive concentration, earning TOP TIER certification in both regular and premium grades pumped from the Fletcher Parkway fuel center. The membership-gated pumps share Fletcher Parkway frontage with the full Costco warehouse and sit within a mile of Sedano Ford, one of the anchor dealerships along La Mesa's automotive retail corridor. High-flow dispensers feed long-reach hoses that allow fueling from either side of the vehicle, and an overhead green-light indicator system directs drivers to available pump positions across the multi-island layout. Routine oil changes are a natural maintenance companion to consistent TOP TIER fueling, and Valvoline Instant Oil Change provides no-appointment-needed synthetic and conventional oil service in the broader Grossmont area. Kirkland Signature gasoline's five-times-EPA detergent formula targets the carbon deposits that accumulate on gasoline-direct-injection intake valves, where fuel no longer washes over the valve face, making supplemental detergent action through the combustion cycle the primary defense against performance-robbing buildup.