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How to Inspect a VK & VL Commodore Before Buying

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Buying a VK or VL Commodore can be exciting, especially given their strong enthusiast following and rising classic value. The VK (1984–1986) and VL (1986–1988) models include everything from reliable six-cylinder cruisers to highly sought-after VL Turbo variants.

However, these vehicles are now well over 35 years old, and condition varies dramatically. Some examples have been carefully maintained, while others have suffered from rust, poor repairs, engine swaps or neglected maintenance.

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Why Inspection Is So Important

Unlike modern vehicles, VK and VL Commodores are:

  • Often modified
  • Prone to rust
  • Subject to engine swaps
  • Affected by electrical ageing
  • Frequently repaired multiple times

A poor purchase can quickly become an expensive restoration project.

Step 1: Check the Body for Rust

Rust is the biggest concern on both VK and VL Commodores.

Key Areas to Inspect

  • Door bottoms
  • Front guards
  • Rear wheel arches
  • Boot floor
  • Windscreen surrounds
  • Floor pans

Warning Signs

  • Bubbling paint
  • Uneven panel surfaces
  • Fresh underbody coating hiding repairs
  • Rust stains near seams

VL models are especially prone to hidden corrosion.

Step 2: Inspect the Floor Pans

Floor rust can be expensive to repair.

What to Look For

  • Damp carpets
  • Soft or spongy floor sections
  • Rust holes under seats
  • Water staining

Lift the carpet if possible during inspection.

Step 3: Check the Boot Area

The boot is a common rust trap.

Inspect

  • Spare wheel well
  • Boot floor seams
  • Tail light surrounds
  • Boot seal area

Warning Sign

Fresh paint in the boot may be hiding repairs.

Step 4: Engine Condition Check

VK and VL Commodores came with several engine options.

VK Engines

  • 3.3L Black Motor six-cylinder
  • 5.0L Holden V8 (rare)

VL Engines

  • 3.0L Nissan RB30E six-cylinder
  • RB30ET Turbo (VL Turbo models)

What to Look For

  • Oil leaks
  • Excessive smoke
  • Rough idle
  • Cooling system condition
  • Modified or swapped engines

Red Flags

  • Poorly executed engine swaps
  • Heavy oil sludge
  • Overheating signs

Step 5: Cooling System Inspection

Cooling issues are common in both models.

Check

  • Radiator condition
  • Coolant colour (rusty or oily fluid is a bad sign)
  • Hoses for cracks
  • Temperature gauge behaviour

Overheating history often indicates deeper engine problems.

Step 6: Transmission Check

Both automatic and manual transmissions were used.

VK Common Transmissions

  • Trimatic (older)
  • Trimatic derivatives

VL Common Transmissions

  • Trimatic
  • Borg-Warner T5 (manual in some models)

What to Test

  • Smooth gear changes
  • No slipping
  • No harsh engagement
  • No strange noises

Warning Signs

  • Delayed shifting
  • Transmission fluid leaks
  • Slipping under load

Step 7: Suspension and Steering

Suspension wear is very common.

Check

  • Uneven ride height
  • Clunking noises
  • Excessive body roll
  • Steering play

Components to Inspect

  • Shock absorbers
  • Control arm bushes
  • Ball joints
  • Steering rack

Step 8: Electrical System Check

Age-related electrical faults are common.

Test

  • Headlights and indicators
  • Dashboard lights
  • Wipers
  • Heater fan
  • Window operation (if fitted)

Common Issues

  • Poor earth connections
  • Alternator failure
  • Wiring corrosion
  • Faulty switches

VL Turbo models often have more complex wiring setups.

Step 9: Interior Condition

Interior condition can reveal how the car was treated.

Check

  • Dashboard cracks
  • Roof lining sagging
  • Seat wear
  • Carpet condition
  • Door trims

Warning Signs

  • Water damage
  • Mismatched trim pieces
  • Excessive wear inconsistent with mileage

Step 10: Signs of Accident Damage

Many VK and VL Commodores have been repaired.

Look For

  • Uneven panel gaps
  • Overspray under seals
  • Weld marks in engine bay or boot
  • Mismatched paint shades

A magnet can help detect excessive filler.

Step 11: Engine Bay Inspection

A clean engine bay is not always a good sign.

Check

  • Rust around strut towers
  • Battery tray corrosion
  • Brake master cylinder area
  • Firewall condition

Warning Sign

Fresh paint in engine bay may hide rust repairs.

Step 12: Check for Modifications

Many VL Commodores, especially Turbos, have been modified.

Common Mods

  • Turbo upgrades
  • Engine swaps (LS, RB, V8 conversions)
  • Lowered suspension
  • Aftermarket wheels

Why It Matters

Poor modifications can reduce reliability and value.

Step 13: Test Drive

A test drive is essential.

Check

  • Acceleration response
  • Gear changes
  • Braking performance
  • Steering feel
  • Engine temperature stability

Warning Signs

  • Hesitation under load
  • Overheating
  • Vibration at speed

Step 14: Paperwork and History

Always verify documentation.

Check

  • Registration status
  • Service history
  • Previous ownership
  • Modification compliance

A clean history adds significant value.

VK vs VL Buying Differences

VK Commodore

  • Generally simpler mechanically
  • Less prone to overheating-related issues
  • Often better value entry point

VL Commodore

  • Higher collector value (especially Turbo models)
  • More complex engine options
  • Higher risk of modifications and rust

Red Flags to Walk Away From

  • Severe rust in structural areas
  • Overheating engine
  • Poor-quality engine swaps
  • Transmission failure
  • Hidden accident damage
  • Missing paperwork

Some repairs are too costly to justify.

Good Signs to Look For

  • Original, unmodified example
  • Clean rust-free body
  • Smooth-running engine
  • Working electrics
  • Honest ownership history

Originality often indicates careful maintenance.

Inspecting a VK or VL Commodore properly is essential before buying. While these models offer strong enthusiast appeal and increasing value, condition varies significantly between vehicles.

Rust, engine condition, cooling system health and modification quality are the most important factors to assess. A careful inspection can help you avoid expensive surprises and ensure you choose a solid base for restoration or enjoyment.

Whether you’re chasing a clean VK SL, a well-kept VL Berlina or a genuine VL Turbo, taking the time to inspect properly will always pay off in the long run.

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