2007 BUICK Lucerne LLT/LC9 (GMX175)

GMX175 / Sedan / North America / select export markets

LLTLC9Exact year/trim recordGold

Engine identity

Engine code

LLT, LC9

Engine summary

The 2007 Buick Lucerne was offered primarily with two V6 engines: a 3.8L naturally aspirated engine (engine code LC9) and a 3.9L Supercharged V6 (engine code LLT). The supercharged LLT offered notably higher output and was available on higher trims.

Displacement

3.8L and 3.9L V6

Power

Approximately 197 hp (3.8L) and 240 hp (3.9L supercharged)

Torque

230 Nm (3.8L) and 344 Nm (3.9L supercharged)

Fuel system

Multi-point fuel injection

Timing drive

Chain-driven timing

OBD port

Verify by VIN and market

Oils and fluids

Oil type

SAE 5W-30 fully synthetic recommended

Oil capacity

Approximately 5.7 liters (service fill including filter change)

Coolant

About 9.5 liters

Fluid

Dexron III or equivalent

Differential fluid

OEM specified hypoid gear oil

Brake fluid

DOT 3 or higher

Service and parts data

Manual transmission

Not offered in 2007 model year

Automatic transmission

4-speed automatic (3.8L) and 4-speed automatic for supercharged variant

Spark plugs

Standard iridium plugs, gap ~0.040 inches

Service interval

Typically 15,000 miles or 12 months for oil change with synthetic oil

Tire sizes

P225/60R16, P235/55R17 depending on trim

Wheel torque

Verify by VIN and market

Common and chronic problems

Supercharger belt and pulley wear on LLT engine
Intake manifold gasket leaks
Cooling system thermostat housing cracks

First checks

Inspect supercharger condition on LLT variants
Check cooling system hoses and thermostat for leaks
Verify transmission fluid condition

Before replacing parts

Save fault codes and freeze-frame data before clearing anything.
Check engine oil, coolant and transmission fluid using the correct temperature and service procedure.
Verify power, ground, connectors, hoses, leaks and live data before replacing expensive parts.

Important notes

The Lucerne was sold primarily in North America; export markets were limited with similar specifications.
Engine code LLT refers to the supercharged 3.9L V6; LC9 is the naturally aspirated 3.8L V6.
Some minor spec variations may occur by market, but generally consistent across North America.

Common codes

P0300 P0420 P0171 P0455

Source and verification notes

2007 Buick Lucerne owner manual and GM service literature
Automotive technical databases and service manuals covering Buick Lucerne 2006-2008

Compatible tools

Verify by VIN and market

FAQ

What engine code does the 2007 BUICK Lucerne LLT/LC9 (GMX175) use? 2007 BUICK Lucerne LLT/LC9 (GMX175) is listed here with engine code LLT, LC9; engine summary: The 2007 Buick Lucerne was offered primarily with two V6 engines: a 3.8L naturally aspirated engine (engine code LC9) and a 3.9L Supercharged V6 (engine code LLT). The supercharged LLT offered notably higher output and was available on higher trims..
What oil and capacity does the 2007 BUICK Lucerne LLT/LC9 (GMX175) use? 2007 BUICK Lucerne LLT/LC9 (GMX175) is listed with SAE 5W-30 fully synthetic recommended and oil capacity Approximately 5.7 liters (service fill including filter change). Confirm market and engine option before service.
What are common 2007 BUICK Lucerne LLT/LC9 (GMX175) problems? Highlighted checks for 2007 BUICK Lucerne LLT/LC9 (GMX175): Supercharger belt and pulley wear on LLT engine, Intake manifold gasket leaks, Cooling system thermostat housing cracks.

Engine identity

Engine code

LLT, LC9

Engine summary

Displacement

3.8L and 3.9L V6

Power

Approximately 197 hp (3.8L) and 240 hp (3.9L supercharged)

Torque

230 Nm (3.8L) and 344 Nm (3.9L supercharged)

Fuel system

Multi-point fuel injection

Timing drive

Chain-driven timing

OBD port

Verify by VIN and market

Service and parts data

Manual transmission

Not offered in 2007 model year

Automatic transmission

4-speed automatic (3.8L) and 4-speed automatic for supercharged variant

Spark plugs

Standard iridium plugs, gap ~0.040 inches

Service interval

Typically 15,000 miles or 12 months for oil change with synthetic oil

Tire sizes

P225/60R16, P235/55R17 depending on trim

Wheel torque

Verify by VIN and market

FAQ

What engine code does the 2007 BUICK Lucerne LLT/LC9 (GMX175) use? 2007 BUICK Lucerne LLT/LC9 (GMX175) is listed here with engine code LLT, LC9; engine summary: The 2007 Buick Lucerne was offered primarily with two V6 engines: a 3.8L naturally aspirated engine (engine code LC9) and a 3.9L Supercharged V6 (engine code LLT). The supercharged LLT offered notably higher output and was available on higher trims..

What oil and capacity does the 2007 BUICK Lucerne LLT/LC9 (GMX175) use? 2007 BUICK Lucerne LLT/LC9 (GMX175) is listed with SAE 5W-30 fully synthetic recommended and oil capacity Approximately 5.7 liters (service fill including filter change). Confirm market and engine option before service.

What are common 2007 BUICK Lucerne LLT/LC9 (GMX175) problems? Highlighted checks for 2007 BUICK Lucerne LLT/LC9 (GMX175): Supercharger belt and pulley wear on LLT engine, Intake manifold gasket leaks, Cooling system thermostat housing cracks.

2007 BUICK Lucerne LLT/LC9 (GMX175)

Engine identity

Oils and fluids

Service and parts data

Common and chronic problems

First checks

Before replacing parts

Important notes

Scanning Engine...

2007 BUICK Lucerne LLT/LC9 (GMX175)

Engine identity

Oils and fluids

Service and parts data

Common and chronic problems

First checks

Before replacing parts

Important notes