2006–2008 Buick Lucerne Lug Nut Torque & Bolt Specs

The 2008 Buick Lucerne lug nut torque is 100 ft-lbs (136 Nm), tightened with a 19mm socket on M12x1.5 studs. Torque in a star pattern in two passes (snug, then final), and re-check after the first 50–100 miles of driving. Use a calibrated torque wrench — not an impact gun — for the final pass.

Lug nut torque: 100 ft-lbs (136 Nm) · Socket size: 19mm · Thread: M12x1.5.

This page is the OEM-referenced fastener summary for the 2008 Buick Lucerne. Use it before any maintenance or repair job where torque values matter — brake work, wheel changes, suspension service, engine teardowns, or oil changes. Specs are pulled from manufacturer service literature, cross-checked against community data, and updated as new chassis variants become available.

These specifications also apply to the 2006 and 2007 model years — identical specs on file for each year.

GM lug-nut torque clusters around 140 ft-lbs (190 Nm) for half-ton Silverado/Sierra and 100 ft-lbs for passenger cars like Malibu, Impala, and Cruze. GM heavy-duty trucks (2500HD/3500HD) jump to 165 ft-lbs. Most GM passenger cars use a 19mm socket; trucks moved from 22mm to 22mm-with-deep-well in 2014. Watch for GM's flat-flange lug nut design on the Silverado — the standard cone-seat aftermarket lugs will not seat correctly.

Common fastener categories on the 2008 Buick Lucerne

Wheel / lug nut torque and thread spec (covered above)
Brake caliper bracket bolts (typically 80-130 ft-lbs) and slide/guide pins (18-35 ft-lbs)
Engine oil drain plug torque — rarely above 30 ft-lbs; always use a new crush washer
Transmission pan, valve cover, and intake manifold bolts (low torque, often 89-106 in-lbs)
Suspension control arm, sway bar, tie rod end and ball joint torque
Spark plug torque (typically 10-15 ft-lbs on aluminum heads — do not exceed)
Differential cover bolts (RWD/4WD only) and transfer case fasteners

Repair guidance for this model year

For 2008 model-year work: Always use a calibrated torque wrench for safety-critical fasteners, and replace lock washers and crush washers on every reassembly.

Tools you will need

Metric socket set (8mm-22mm), 6-point impact-rated
Calibrated torque wrench (10-150 ft-lbs covers most automotive jobs; add a 0-250 ft-lbs wrench for truck lug nuts)
Breaker bar (24" minimum) for initial loosening
Penetrating oil (PB Blaster or Kroil) for any fastener over 5 years old
Anti-seize on stainless or dissimilar-metal threads; thread-locker (Loctite blue) on critical reassembly

Frequently asked questions

What is the lug nut torque on a 2008 Buick Lucerne?

The OEM-specified lug-nut torque for the 2008 Buick Lucerne is 100 ft-lbs (136 Nm), using a 19mm socket on M12x1.5 thread studs. Use a calibrated torque wrench in a star pattern, in two passes (50% and 100%), and re-check after 50-100 miles of driving.

What socket size do I need for the 2008 Buick Lucerne lug nuts?

The 2008 Buick Lucerne uses a 19mm socket. A 6-point impact-rated socket is recommended over a 12-point chrome socket — 12-points round off lug nuts under impact-driver use.

Are the 2008 Buick Lucerne fasteners metric or SAE?

Metric is the standard for this vehicle. Most fasteners on this vehicle are metric (M6, M8, M10, M12, M14). Bring a full metric set; SAE substitutes can round the head. Bolt-head markings are the fastest way to confirm grade and material at the bench.

Other Buick Lucerne years

Same model, different model year — fastener spec may change. Always confirm against the year for your VIN.

→ 2008 Buick Lucerne suspension & steering torque specs (control arm, ball joint, tie rod)

All 47 2008 Buick Lucerne fastener specs

Per-bolt torque, wrench size, and thread spec for the 2008 Buick Lucerne, sourced from OEM service literature and verified against community shop data. Values pair imperial (ft-lb) and metric (Nm) where the manufacturer publishes both.

Wheels — 2008 Buick Lucerne

Wheel and lug nut spec for the 2008 Buick Lucerne. Lug nut tightens to 100 ft-lbs (136 Nm), takes a 19mm driver, runs on M12x1.5 threads.

Brakes — 2008 Buick Lucerne

Brake fasteners on the 2008 Buick Lucerne — caliper bracket, slide pins, and banjo bolt torque follow. The front brake caliper bracket bolt is a M14x2.0 thread, torqued to 133 ft-lbs (180 Nm). The front brake caliper guide-pin bolt torques to 27 ft-lbs (36 Nm) (M10x1.5 thread).

Engine — 2008 Buick Lucerne

Engine bolt-by-bolt torque for the 2008 Buick Lucerne, including the long block, valve covers, and intake. At the oil pan drain, the oil pan drain plug (3.8l 3800 v6) torques to 22 ft-lbs (30 Nm). For the flywheel to crankshaft, plan for the right driver; final torque is Step 1: 11 ft-lbs (15 Nm) | Step 2: +50 degrees (engine flywheel/flexplate bolt (3.8l 3800 v6)). Water pump pulley bolt (3.8l 3800 v6) tightens to 116 in-lbs (13 Nm), located at the water pump pulley. The spark plug uses a 5/8 in drive on a M14x1.25 thread, torqued to 15 ft-lbs (20 Nm). At the rocker arm to cylinder head, the valve rocker arm bolt (3.8l 3800 v6) torques to Step 1: 11 ft-lbs (15 Nm) | Step 2: +90 degrees. For the engine block - knock sensor, plan for the right driver; final torque is 13 ft-lbs (18 Nm) (knock sensor (3.8l 3800 v6)). Water pump bolt (3.8l 3800 v6) tightens to Large bolt: 25 ft-lbs (34 Nm) | Small bolt: 16 ft-lbs (22 Nm), located at the water pump to front cover. The crankshaft main bearing cap bolt (3.8l 3800 v6), torqued to Step 1: 30 ft-lbs (40 Nm) | Step 2: +110 degrees at the main bearing cap - vertical bolts. At the lower intake manifold, the lower intake manifold bolt (3.8l 3800 v6) torques to 11 ft-lbs (15 Nm). For the camshaft sprocket, plan for the right driver; final torque is Step 1: 74 ft-lbs (100 Nm) | Step 2: +90 degrees (camshaft sprocket bolt (3.8l 3800 v6)). Balance shaft driven gear bolt (3.8l 3800 v6) tightens to Step 1: 16 ft-lbs (22 Nm) | Step 2: +70 degrees, located at the balance shaft driven gear. The exhaust manifold pipe nut (3.8l 3800 v6), torqued to 30 ft-lbs (40 Nm) at the exhaust pipe to manifold. At the oil filter to adapter, the oil filter (3.8l 3800 v6) torques to 22 ft-lbs (30 Nm). For the cylinder head - spark plug, plan for the right driver; final torque is 11 ft-lbs (15 Nm) (spark plug (3.8l 3800 v6)). Exhaust manifold heat shield nut (3.8l 3800 v6) tightens to 15 ft-lbs (20 Nm), located at the exhaust manifold heat shield. The valve rocker arm cover bolt (3.8l 3800 v6), torqued to 89 in-lbs (10 Nm) at the valve/rocker cover. At the cylinder head to block - 8 bolts per head, 16 per engine; 4 long + 4 short, the cylinder head bolt (3.8l 3800 v6) torques to Step 1: 37 ft-lbs (50 Nm) | Step 2: +120 degrees (9/16" drive, 7/16"-14 UNC thread). For the exhaust manifold stud into head, plan for the right driver; final torque is 89 in-lbs (10 Nm) (exhaust manifold stud (3.8l 3800 v6)). Camshaft thrust plate bolt (3.8l 3800 v6) tightens to 11 ft-lbs (15 Nm), located at the camshaft thrust plate. The oil pan bolt (3.8l 3800 v6), torqued to 125 in-lbs (14 Nm) at the oil pan to block. At the main bearing cap - side bolts, the crankshaft main bearing cap side bolt (3.8l 3800 v6) torques to Step 1: 11 ft-lbs (15 Nm) | Step 2: +45 degrees. For the timing chain dampener, plan for the right driver; final torque is 16 ft-lbs (22 Nm) (timing chain dampener bolt (3.8l 3800 v6)). Throttle body bolt/nut (3.8l 3800 v6) tightens to 89 in-lbs (10 Nm), located at the throttle body to intake. The water outlet housing bolt (3.8l 3800 v6), torqued to 20 ft-lbs (27 Nm) at the thermostat/water outlet housing. At the front/timing cover, the engine front cover bolt/stud (3.8l 3800 v6) torques to Step 1: 15 ft-lbs (20 Nm) | Step 2: +40 degrees. For the connecting rod bearing cap, plan for the right driver; final torque is Step 1: 20 ft-lbs (27 Nm) | Step 2: +50 degrees (connecting rod bearing cap bolt (3.8l 3800 v6)). Heated oxygen sensor (3.8l 3800 v6) tightens to 31 ft-lbs (42 Nm), located at the o2 sensor in exhaust. The balance shaft retainer bolt (3.8l 3800 v6), torqued to 22 ft-lbs (30 Nm) at the balance shaft retainer. The engine oil drain plug torques to 18 ft-lbs (25 Nm) (M14x1.5 thread). For the coolant temperature sensor, plan for the right driver; final torque is 18 ft-lbs (25 Nm) (engine coolant temperature sensor (3.8l 3800 v6)). Upper intake manifold bolt (3.8l 3800 v6) tightens to 89 in-lbs (10 Nm), located at the upper intake manifold (plenum). The exhaust manifold bolt/nut (3.8l 3800 v6), torqued to 22 ft-lbs (30 Nm) at the exhaust manifold to cylinder head. At the harmonic balancer to crankshaft, the crankshaft balancer bolt (3.8l 3800 v6) torques to Step 1: 111 ft-lbs (150 Nm) | Step 2: +76 degrees.

Drivetrain — 2008 Buick Lucerne

Drivetrain and driveline fasteners for the 2008 Buick Lucerne — axle, transmission, and differential plugs. For the flexplate to torque converter, plan for the right driver; final torque is 46 ft-lbs (63 Nm) (flywheel to torque converter bolt (3.8l 3800 v6)). Engine to transaxle mounting bolt (3.8l 3800 v6) tightens to 55 ft-lbs (75 Nm), located at the engine block to transaxle bellhousing. The front hub/axle nut uses a 36mm drive on a M24x1.5 thread, torqued to 118 ft-lbs (160 Nm).

Suspension — 2008 Buick Lucerne

Suspension and chassis fastener torque for the 2008 Buick Lucerne — strut, control arm, and sway bar values. Front strut upper mount nuts tightens to 37 ft-lbs (50 Nm). The lower control arm-to-frame bolt (front), torqued to 93 ft-lbs (126 Nm). The front wheel hub-to-knuckle bolts torques to 96 ft-lbs (130 Nm). plan for the right driver; final torque is 131 ft-lbs (178 Nm) (front strut-to-knuckle bolt/nut). Front sway bar link nut tightens to 48 ft-lbs (65 Nm). The lower ball joint nut is a M14x1.5 thread, torqued to seat to 88 in-lbs then align, min 41 ft-lbs (55 Nm). The lower control arm-to-frame bolt (rear) torques to 117 ft-lbs (158 Nm).

Steering — 2008 Buick Lucerne

Steering linkage fasteners on the 2008 Buick Lucerne. The outer tie rod end nut is a M12x1.25 thread, torqued to 35 ft-lbs (47 Nm), up to 52 ft-lbs to align pin.

New to torquing wheels? Read our How lug nut torque works — the complete guide for star-pattern sequence, re-torque intervals, and how to read a lug spec — then use the 2008 Buick Lucerne numbers above.

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