PontiacG82008Overview/pontiac/g8/2008/base/

2008 Pontiac G8

Factory specifications, fluid capacities, torque values, EPA fuel economy and the federal safety record for the 2008 G8.

Body PASSENGER CAR

The 2008 Pontiac G8 enters the reference record as a passenger car whose engine calls for 7 quarts of 5W-30 API oil at service — a useful technical anchor for any write-up. The first model year also established its NHTSA footprint, drawing 71 owner complaints with the airbag system singled out as the most-cited area and four recalls logged against the vehicle. That figure sits inside a 2008–2010 complaint arc that crested at 144 reports in 2009 and bottomed out at a single complaint in 2010, positioning the 2008 model year as the launch point of a sharply uneven three-year reliability history researchers should weigh with that volatility in mind.

Model year20092008

Quick specs

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

Engine oil capacity7 qtOEM · verified
Engine oil type5W-30 APIOEM · verified
Lug nut torque125 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 94R · 700 CCA battery, OE oil filter 12690386. 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 94R · 700 CCAOEM · verified
Tire sizeP245-45VR18OEM · verified
Wheel / rim8.0-JJ inOEM · verified

OE service part numbers OEM · verified

Engine oil filter12690386 alt 12577653
Engine air filter92066873
Fuel filter92203248
Spark plug12621258 alt 19300872
Front wiper blades92219234 alt 92219233
Serpentine belt92248982 alt 92068285
Thermostat12600171 alt 12570307
Cabin air filter92184248

Full specifications

Engine, drivetrain, dimensions and economy.

Dimensions & weight NHTSA vPIC

Overall length196.1 in
Overall width74.4 in
Overall height57.9 in
Wheelbase115 in
Curb weight3885 lb
Track (front / rear)62.2 / 63.4 in
Weight distribution (front / rear)50/50

Performance & power Independent road tests

0–60 mph, quarter-mile, horsepower and torque from independent road tests.

Independent road tests for the G8 of this era, listed by trim and engine — this page spans more than one engine, so no single horsepower figure is shown.

5.2–7.0 sec0–60 mph (tested)quickest 5.20 sec — 2008 GT Sedan
YearTrim / engine0–60¼ mileHPDrivetrain
2008GT Sedan 6.0L V85.20 sec13.80 sec361 hpRWD
2008GT Sedan 6.0L V85.30 sec13.80 sec361 hpRWD
2008GT Sedan 6.0L V85.30 sec13.80 sec361 hpRWD
2008GT Sedan 6.0L V85.60 sec14.10 sec361 hpRWD
2008Sedan 3.6L V67.00 sec15.40 sec256 hpRWD
2009GXP Sedan 6.2L V84.50 sec13.00 sec415 hpRWD
2009GXP Sedan 6.2L V84.70 sec13.30 sec415 hpRWD
2009GXP Sedan 6.2L V84.70 sec13.30 sec415 hpRWD

Service quick specs OEM factory data

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

This engine holds 7 qt of 5W-30 API engine oil, GM P/N 92184900 OR EQUIVALENT in the differential, DOT 3 brake fluid. Torque lug nuts to 125 ft-lbs, the oil drain plug to 18.0 ft-lbs. The firing order is 1-8-7-2-6-5-4-3. 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
Brake FluidDOT 3
Differential Gear OilGM P/N 92184900 OR EQUIVALENT
Differential Gear Oil Capacity2.5 qt
Engine Oil5W-30 · API
Engine Oil Capacity7 qt
Engine Oil5W-30 · API

Engine torques

Engine Oil Pan Drain Plug22.0 ft-lbs
Engine Oil Pan Drain Plug18.0 ft-lbs
Engine Valve Cover Bolts7.4 ft-lbs

Chassis torques

Lug Nuts125 ft-lbs

Ignition

Cylinder Firing Order1-6-5-4-3-2
Cylinder Firing Order1-8-7-2-6-5-4-3

Battery & A/C

RefrigerantR134a
Refrigerant Capacity1.28 lbs
Oil GroupPAG
Oil Type46
Oil Capacity3.30-4.70 oz
Standard BCI Group Number94R
Standard BCI Cranking Performance700 cca
Standard BCI Group Number94R

Service checks

Pressure Test15 psi
Radiator Cap Pressure Relief15 psi
Thermostat Opening Temperature180 °F
Pressure Test15 psi
Radiator Cap Pressure Relief15 psi
Thermostat Opening Temperature186 °F
Key ON Engine OFF (KOEO)50-60
RPM43-45 @ Idle rpm

Brakes

Torque Caliper to Bracket31 ft-lbs
Minimum Pad ThicknessFront: 0.118; Rear: 0.118 in
Rotor Max Parallel Variation0.001 in
Rotor Runout Limit0.002 in
Rotor Nominal Thickness From1.181 in / 0.866 in
Rotor Nominal Thickness To1.181 in / 0.866 in
Rotor Minimum Machining1.132 in / 0.817 in
Rotor Discard at or Under1.102 in / 0.787 in

Multi-step torque procedures OEM · verified

Torque to Knuckle — tightening sequence 1 stages
1120
Crankshaft Pulley and/or Damper Bolts — tightening sequence 1 stages
174 ft. lbs., step 2: 15074 ft. lbs
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 3 stages

Prep M11 bolts 1-10

122 ft. lbs.22 ft. lbs
290 degrees90 degrees
370 degrees; M8 bolts 11-1570 degrees
122 ft. lbs.22 ft. lbs
222

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 Plugs (replace) · 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.

In 2008 the Pontiac G8 logged 71 consumer complaints, 4 recalls and an unusually high 949 technical service bulletins (TSBs), positioning it as the low‑point in complaints between the 2009 spike (144 complaints, same 4 recalls, 997 TSBs) and the dramatic drop in 2010 (just 1 complaint, no recalls, 929 TSBs). The complaint volume therefore follows a brief upward arc in 2009 before collapsing in 2010, while recall activity remains flat at four units for both 2008 and 2009 and disappears in 2010. The most frequent 2008 issues involve airbags (20 reports), suspension (9), electrical system (8) and power‑train (6), with only two crash‑related and one fire‑related complaints recorded. This pattern suggests that, although the 2008 model had a moderate number of problems, they were largely addressed through numerous TSBs and did not translate into additional recalls; the subsequent year’s surge and the next year’s near‑zero complaints imply that many of these concerns were resolved. Consequently, the 2008 G8 is a borderline choice: it is not the worst year, but buyers should verify that all relevant TSBs have been performed before purchase.

4
Open recalls
NHTSA campaigns
949
Service bulletins
Manufacturer communications
0
ODI investigations
Office of Defects Investigation
71
Owner complaints
2 involved a crash · 1 a fire
Owner complaints by model year NHTSA · this generation & adjacent

Owner complaints filed with NHTSA, by component

All 71 complaints on record, top 8 components.

Air Bags20
Suspension9
Electrical System8
Power Train6
Engine4
Steering4
Seat Belts2
Steering,Electrical System,Air Bags1

Source: NHTSA Office of Defects Investigation complaint database.

Recalls NHTSA · verified

Showing 2 of 4 campaigns on record for this vehicle.

14V540000Electrical System:IgnitionReported 09/09/2014

General Motors LLC (GM) is recalling certain model year 2011-2013 Chevrolet Caprice vehicles manufactured October 15, 2010, to December 6, 2013, and 2008-2009 Pontiac G8 vehicles manufactured July 25, 2007, to February… Remedy: GM will notify owners, and dealers will remove the key blade from the original flip key/RKE transmitter assemblies, and cut and fit a revised key blade and housing assembly, in…

15V399000Seat BeltsReported 23/06/2015

General Motors LLC (GM) is recalling certain model year 2011-2013 Chevrolet Caprice vehicles manufactured October 15, 2010, to October 22, 2013, and 2008-2009 Pontiac G8 vehicles manufactured July 25, 2007, to February… Remedy: GM will notify owners, and dealers will replace the seat belt tensioner assembly which includes the steel cable, free of charge. These replacement parts reposition the tensioner…

Technical service bulletins NHTSA · verified

Showing 5 of 949 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 G8. 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 G8 take?

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

Does the 2008 G8 have open recalls?

NHTSA lists 4 recall campaign(s) for this model year. Check your specific vehicle by VIN.