Parts for your 2008 Holden Commodore-Oil seals

2008 Holden Commodore oil seals: what they do and when to service them

Based on the Holden VE Commodore Workshop Manual (Engine Mechanical, Automatic Transmission, and Rear Drive Axle) and GM’s Global Electronic Parts Catalogue for 2008 models, oil seals are absolutely fitted to the 2008 Holden Commodore and are a normal service consideration. Those documents list crankshaft, camshaft, transmission input/output, axle, and differential pinion oil seals across the common VE V6 and V8 drivetrains, so the part is very much relevant to this vehicle.

On a 2008 Commodore, oil seals keep engine, transmission, and diff lubricants where they belong. They sit around rotating shafts and at cover interfaces, forming a pressurised barrier so oil can circulate and cool components without seeping out. In everyday terms, they help the Alloytec V6 or Gen IV V8 stay tidy under the bonnet, keep the slushbox or manual shifting smoothly, and stop the rear end from weeping onto the driveway.

While oil seals aren’t a fixed-interval replacement item, they’re worth checking during routine servicing, especially as kilometres climb. Heat cycles, age hardening, and a bit of grime can make a once-supple seal turn brittle or glazed. Catching a sweat early is cheaper than dealing with a proper leak later.

• Common seals on the VE: front crank seal, rear main seal, timing cover and cam seals (engine), transmission input/output shaft seals, axle and diff pinion seals.
• Tell-tale signs: oil mist at the crank pulley, clutch slip or bellhousing oil (rear main on manuals), auto trans fluid at the selector or tailshaft, wetness at the diff nose or axle ends, and burning oil smells on hot components.

Service tips that make sense for the Commodore:

• Inspect seals and breathers at each service, excessive crankcase pressure (blocked PCV on V6/V8) can force leaks.
• Replace seals proactively when nearby work is being done (e.g., rear main when the gearbox is out, front crank when the balancer is off, pinion seal when setting up a diff).
• Use quality OEM-spec seals and the correct installer tools, lightly oil lips unless the service manual specifies dry install. Check the shaft surface for grooves and runout.
• Follow workshop manual torque specs and sealant instructions on covers, over-torquing or the wrong goo can create fresh leaks.

Look after the seals and they’ll look after the Commodore—keeping fluids in, costs down, and weekend drives drama-free.

Popular question: Where do oil leaks most often show up on a 2008 Commodore?

Typical spots are the front crank area (behind the harmonic balancer), the bellhousing joint (rear main), the transmission output to the tailshaft, and the diff pinion nose. A quick underbody glance after a drive usually shows any fresh weeps.

Popular question: What does it usually cost to replace a rear main seal?

Because the gearbox has to come out, it’s mostly labour. In Australia and New Zealand, workshops commonly quote a ballpark of AUD/NZD $800–$1,500, varying with auto vs manual, model, and whether a clutch, flexplate, or other parts are done at the same time.

Popular question: Will a stop-leak additive fix a leaking seal?

Additives may swell a tired seal slightly, but results are hit-and-miss and can be short-lived. It’s smarter to check PCV/breathers and address the root cause, if the seal lip is worn or the shaft is grooved, proper replacement is the reliable fix.