In mid-1996 GM implemented a redesigned engine cooling system incorporating twin non bypass-blocking thermostats and a 130 US gallons per minute (490 liters per minute) water pump. GM replaced the DB-2 with the electronic throttle DS-4 in 1994-2000 vehicles. The 1992-1993 model years used a 6.5-specific Stanadyne DB-2 mechanical injection pump. Additional RPO codes are LQM 175 hp (130 kW) and LQN 190 hp (142 kW).Ĭhanges were made by GM to the 6.5 in their light trucks for emissions or reliability improvement. The L49 (VIN "P") and L57 are both naturally aspirated engines. GM was the first manufacturer to introduce an electronically controlled fuel injection system into a diesel pickup truck. There is a soot trap on L65 engines that is often mistaken for a catalytic converter. The L65 engine has no EGR, and has no catalytic converter. The L56 is emissions controlled with EGR and catalytic converters. Heavy duty 3/4 ton and 1 ton trucks used the Turbocharged L65 (VIN "F") engine. The Turbocharged L56, ( VIN "S") was used in most light duty 3/4 ton (2500). There are several GM 6.5-liter diesel engine production options. The Duramax 6600 replaced the 6.5 in light trucks beginning in 2001 and the C3500HD medium duty cab and chassis (replaced by C4500 Kodiak/Topkick) and vans beginning in 2003, but the 6.5 (6500 Optimizer) is still produced by AM General for the HMMWV. This engine was never meant to be a power and torque competitor with Ford/International and Dodge/Cummins, but rather a simply designed workhorse engine that made credible power, achieved decent fuel economy and met emission standards in half-ton trucks. The 6.5 L (395 cu in) version was introduced in 1992 to replace the 6.2.
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