PontiacG62008Overview/pontiac/g6/2008/base/

2008 Pontiac G6

Factory specifications, fluid capacities, torque values, EPA fuel economy and the federal safety record for the 2008 G6.

Body PASSENGER CAR

The 2008 Pontiac G6 enters the record as a mid-size passenger car built on GM’s Epsilon platform, powered by a range of four- and six-cylinder engines that, while unremarkable on paper, delivered the expected balance of efficiency and refinement for its class—though its 4.5-quart oil capacity and 5W-30 API specification hint at a design prioritizing straightforward maintenance. With 1,077 owner complaints logged for the model year, the G6’s reliability narrative is defined by persistent steering issues, a recurring pain point that accounted for much of the feedback, alongside five official recalls that underscore the car’s mid-pack dependability challenges. Positioned between the 2006 peak of 1,909 complaints and the far quieter 2003 debut, the 2008 model year reflects neither the worst nor the most trouble-free iteration of the nameplate, instead offering a snapshot of a vehicle caught between early teething problems and later refinements—one that demands careful scrutiny from owners and researchers alike.

Model year201020092008200720062005

Quick specs

Fluid capacities, tune-up values and fuel economy at a glance.

Engine oil capacity4.5 qtOEM · verified
Engine oil type5W-30 APIOEM · verified
Lug nut torque100 ft-lbsOEM · verified

Fitment & sizes

Replacement part sizes and factory part numbers — battery, bulbs, filters and belts.

From the factory this vehicle uses a BCI 90 · 590 CCA battery, OE oil filter 12731179. Each part links to every other vehicle that shares it, so a part you already stock may fit more of your fleet than you'd expect.

Battery groupBCI 90 · 590 CCAOEM · verified
Tire sizeP215-60R16OEM · verified

OE service part numbers OEM · verified

Engine oil filter12731179 alt 12690386
Engine air filter10366901 alt 22676970
Spark plug12681662 alt 12681663
Battery88866263
Front wiper blades19432584 alt 19432583
Serpentine belt12577771 alt 12639468
Thermostat12622410 alt 12591881

Full specifications

Engine, drivetrain, dimensions and economy.

Dimensions & weight NHTSA vPIC

Overall length189 in
Overall width70.5 in
Overall height57.1 in
Wheelbase112.2 in
Curb weight3413 lb
Track (front / rear)59.4 / 60.6 in
Weight distribution (front / rear)62/38

Service quick specs OEM factory data

Capacities, torques and tune-up values from the factory service manual.

This engine holds 4.5 qt of 5W-30 API engine oil, DOT 3 brake fluid. Torque lug nuts to 100 ft-lbs, the oil drain plug to 18.0 ft-lbs. The firing order is 1-6-5-4-3-2. Note the cylinder-head bolts finish on a torque angle (torque-to-yield) — they stretch permanently and should be replaced, not reused, during any head service.

Lubricants & capacities

Automatic Transmission FluidATF
Automatic Transmission Fluid Capacity6.3
Brake FluidDOT 3
Engine CoolantDEX-COOL OR EQUIVALENT
Engine Oil5W-30 · API
Engine Oil Capacity4.5 qt
Engine Oil5W-30 · API
Engine Oil Capacity5.5 qt

Engine torques

Intake Manifold to Engine Bolts7.4 ft-lbs
Exhaust Manifold to Cylinder Head Bolts10 ft-lbs
Intake Manifold to Engine BoltsUpper: 18 ft-lbs
Exhaust Manifold to Cylinder Head Bolts12 ft-lbs
Intake Manifold to Engine Bolts17 ft-lbs
Exhaust Manifold to Cylinder Head Bolts15 ft-lbs
Exhaust Manifold to Cylinder Head Bolts15 ft-lbs
Engine Oil Pan Drain Plug18.0 ft-lbs

Chassis torques

Lug Nuts100 ft-lbs
Front Wheel Hub159 ft-lbs

Ignition

Cylinder Firing Order1-3-4-2
Cylinder Firing Order1-6-5-4-3-2

Battery & A/C

RefrigerantR134a
Refrigerant Capacity1.10 lbs
Oil GroupPAG
Oil Type46
Oil Capacity5.00 oz
Standard BCI Group Number90
Standard BCI Cranking Performance590 cca
Standard BCI Group Number90

Service checks

Pressure Test15, Pressure should not exceed 20 psi.
Radiator Cap Pressure Relief15 psi
Thermostat Opening Temperature185-205 °F
Key ON Engine OFF (KOEO)50-60.0
Key ON Engine OFF (KOEO)56-62
Key ON Engine OFF (KOEO)56-62
Key ON Engine OFF (KOEO)50-60
Injector Primary Resistance11-14 @ 50-95 degreesF ohms

Brakes

Torque Caliper to Bracket26 ft-lbs
Torque to Knuckle96 ft-lbs
Minimum Pad ThicknessFront: 0.030; Rear: 0.030 specification
Rotor Max Parallel Variation0.001 in
Rotor Runout Limit0.002 in
Rotor Nominal Thickness From1.023 in / 0.551 in
Rotor Nominal Thickness To1.023 in / 0.551 in
Rotor Minimum Machining0.906 in / 0.472 in

Multi-step torque procedures OEM · verified

Crankshaft Pulley and/or Damper Bolts — tightening sequence 1 stages
174 ft. lbs., step 2: 12574 ft. lbs
Crankshaft Pulley and/or Damper Bolts — tightening sequence 1 stages
1installation, 92 ft. lbs., step 2: remove bolt, step 3: install new bolt, 92 ft. lbs., step 4: 13092 ft. lbs
Crankshaft Pulley and/or Damper Bolts — tightening sequence 1 stages
174 ft. lbs., step 2: 15074 ft. lbs
Crankshaft Pulley and/or Damper Bolts — tightening sequence 1 stages
1installation, 92 ft. lbs., step 2: remove bolt, step 3: install new bolt, 92 ft. lbs., step 4: 13092 ft. lbs
Cylinder Head — tightening sequence 2 stages

Prep Bolts 1-10:

122 ft. lbs.22 ft. lbs
2155 degrees.; Front cylinder head bolts; 26155 degrees
Cylinder Head — tightening sequence 2 stages
144 ft. lbs.44 ft. lbs
2140
Cylinder Head — tightening sequence 2 stages

Prep M11 bolts

122 ft. lbs.22 ft. lbs
2150 degrees; M8 bolts 9-10150 degrees
111 ft. lbs.11 ft. lbs
275 degrees; Do not reuse cylinder head bolts. Do not allow oil on cylinder head, head bolt bosses.75 degrees
Cylinder Head — tightening sequence 2 stages
144 ft. lbs.44 ft. lbs
2140 degrees; Do not re-use old bolts.140 degrees

Factory maintenance schedule OEM · verified

Normal service, condensed from the factory interval matrix.

Under the factory schedule, replace the spark plugs every 100,000 mi; coolant at 150,000 mi. The big-interval services (at 150,000 mi for coolant, and the transmission fluid) are the ones owners most often skip — on a lower-mileage example, assume the original fluids are still in it and check them first.

Every 25,000 miExhaust System (Complete) (inspect) · Fuel System (inspect)
Every 50,000 miEngine Air Filter Element (replace)
Every 100,000 miSpark Plug Wires (inspect) · Spark Plugs (replace) · Transmission Assembly (drain & refill) · Transmission Fluid & Filter (replace)
At 150,000 miAccessory Drive Belt (inspect) · Engine Coolant System (drain, flush & refill)

Reliability & federal safety record

Owner-reported issues, recalls, investigations and service bulletins on record with NHTSA — an unfiltered look at what owners actually experience.

The 2008 Pontiac G6 sits on the clearly descending slope of the model's complaint arc, logging 1,077 complaints — well below the 2006 peak of 1,909 but still substantially elevated relative to the pre-volume years of 2003–2004 (1–2 complaints). The pattern is one of a maturing generation: recall counts held steady at 5 (matching 2005, 2007, and 2009), and open investigations had already begun easing from 4 in 2005–2006 down to 2. Even so, the complaint profile is heavily concentrated — Steering alone accounts for 324 of the year's filings, the single largest category, followed by Exterior Lighting (86) and Air Bags (56) — and the 37 crash and 19 fire complaints logged for this model year remain non-trivial safety flags, though the federal data does not specify a root cause behind the steering cluster. Worth noting is that technical service bulletins continued climbing to 1,019 (the highest in the dataset), though TSB counts tend to accumulate with vehicle age rather than necessarily signal new defects in the target year. On balance, 2008 is a meaningfully better choice than 2005–2007 in this generation, but the steering-heavy complaint volume and persistent fire/crash reports make a pre-purchase inspection of the steering and lighting systems — along with verification that all 5 recalls have been completed — a wise step before buying.

5
Open recalls
NHTSA campaigns
1019
Service bulletins
Manufacturer communications
2
ODI investigations
Office of Defects Investigation
1,077
Owner complaints
37 involved a crash · 19 a fire
Owner complaints by model year NHTSA · this generation & adjacent

Owner complaints filed with NHTSA, by component

All 1,077 complaints on record, top 8 components.

Steering324
Exterior Lighting86
Electrical System,Exterior Lighting63
Air Bags56
Power Train54
Fuel/Propulsion System42
Service Brakes32
Electrical System21

Source: NHTSA Office of Defects Investigation complaint database.

Recalls NHTSA · verified

Showing 2 of 5 campaigns on record for this vehicle.

14V252000Electrical System:WiringReported 14/05/2014

General Motors LLC (GM) is recalling certain model year 2004-2012 Chevrolet Malibu vehicles manufactured May 16, 2003, through October 11, 2012, 2004-2007 Malibu Maxx vehicles manufactured June 25, 2003, through April… Remedy: GM will notify owners, and dealers will attach the wiring harness to the BCM with a spacer, apply dielectric lubricant to both the BCM and harness connector and the BAS and…

14V153000Steering:Electric Power Assist SystemReported 31/03/2014

General Motors LLC (GM) is recalling certain model year 2004-2006 and 2008-2009 Chevrolet Malibu, 2004-2006 Malibu Maxx, 2009-2010 HHR (non-turbo), 2010 Cobalt, 2008-2009 Saturn Aura and 2004-2007 Ion, and 2005-2009… Remedy: GM will notify owners, and dealers will perform one of four bulletins. Parts are not currently available. GM expects to send an interim notification around May 28, 2014. When…

Technical service bulletins NHTSA · verified

Showing 5 of 1019 bulletins on record with NHTSA.

BulletinDateComponentSummary
135982025-09-09Unknown Or OtherNew Vehicle Monitoring Programs Section in IVH
PIC5650M2025-08-06Unknown Or OtherThis Preliminary Information communication provides information to the technician about…
PIP5601C2025-07-18Unknown Or OtherThis PI communicates the requirement to provide a pico file to receive diagnostic…
PIT5074R2025-05-30Unknown Or OtherThis Preliminary Information communication provides information to the technician about…
PIT5074R2025-05-30Unknown Or OtherThis Preliminary Information communication provides information to the technician about…

Common OBD-II trouble codes

The most common OBD-II codes for this vehicle's emissions system. These are standardized SAE J2012 definitions, not vehicle-specific fault reports.

P0420
Catalyst system efficiency below threshold — Bank 1
P0300
Random / multiple cylinder misfire detected
P0171
System too lean — Bank 1
P0455
Evaporative emission system leak detected — large leak
P0128
Coolant thermostat below regulating temperature
P0442
Evaporative emission system leak detected — small leak

VIN tools

Decode factory build data for a specific vehicle by VIN.

VIN
Decode a VIN to confirm the transmission and build data for a specific G6. OEM
Build data
Plant, GVWR class, engine and body data for any 17-character VIN.
Recalls
Check open recall campaigns against a specific vehicle by VIN.

Vehicles with shared specs

Find every vehicle that shares this one's battery, bulbs, oil capacity, platform or parts.

Reference guides

Cross-vehicle references for the kinds of data on this page.

Frequently asked

How much oil does the 2008 G6 take?

4.5 qt of 5W-30 API, per the factory manual.

Does the 2008 G6 have open recalls?

NHTSA lists 5 recall campaign(s) for this model year. Check your specific vehicle by VIN.