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QG18DE Engine 1.8L Review

QG18DE Engine 1.8L

QG18DE engine is the same as 1.6 liter QG16DE, but it has bigger bore (80.0 mm), as the result, its displacement is 1.8 liter. That gave more torque at low rpm. But these 1.8 and 1.6-liter engine are very similar.

QG18DE uses the same variable valve timing system (CVTC) on the same camshaft, timing chain, intake manifold with valves, cylinder head, and others. There are no hydraulic tappets in the engine also (every 60,000 miles, please, visit a service for valve gap adjustment). The engine is quite ordinary, nothing special, no nanotechnology and that because it will run a long mileage.

Engine Specs

Manufacturer
Atsuta Plant, Aguascalientes plant
Year
1999-2006
Cylinder Block Material
Cast Iron
Fuel system
Electronic fuel injection
Configuration
inline
Number of cylinders
4
Valves per cylinder
4
Stroke, mm
88.0
Bore, mm
80.0
Compression Ratio
9.5
Displacement, cc
1769
Power, hp
116-125/5600; 128/6000
Torque, lb ft
130/4000
Engine weight
Engine oil viscosity
5W-20, 10W-30, 15W-40
Engine oil capacity, liter
2.7
Oil change interval, mile
10,000
Oil consumption per 1000 miles as normal
Applications
Nissan Almera, Nissan Primera, Nissan Pulsar, Nissan Sentra, Nissan Sunny, Nissan Expert, Nissan Avenir

Nissan QG18DE Engine Problems and Reliability

1. Engine consumes too much oil. This is the special feature of that engine. Usually, consumption is up to 0.5 liters per 600 miles, but if it is around 1 liter, you should contact with service or auto repair shop.
2. There is a problem with the idle valve gasket. Every engine eventually starts leaking by antifreeze directly to the engine control unit. The issue is fixed by replacing the gasket.
3. The timing chain is not too reliable. 100,000 mileage and better to change the timing chain.

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