Learn About Your Car

Your car, services, and appointments in one place.

Estimates last updated October 16, 2025

GMC G3500 Valve Cover Gasket Replacement Cost

The average cost for a GMC G3500 Valve Cover Gasket Replacement is between $160 and $217.

Labor costs are estimated between $122 and $179 while parts are typically priced around $38.
This range does not include taxes and fees, and does not factor in your unique location. Related repairs may also be needed.

For a more accurate estimate based on your location, use our Fair Price Estimator below.

Quality Car Repair.
Fair Prices.

Get a fair price estimate on GMC G3500 Valve Cover Gasket Replacement in your area - honored at RepairPal Certified locations.

Valve Cover Gasket Replacement

What is a valve cover gasket?

The valve cover sits atop the cylinder head, and the valve cover gasket is sandwiched between them to keep circulating oil inside. The majority of valve cover gaskets are molded rubber, tailored to fit. In some cases, the spark plug tube gaskets are part of the valve cover gasket, and are replaced at the same time. Valve cover gaskets are different than head gaskets.

What are the symptoms related to a bad valve cover gasket?

A bad valve cover gasket will result in an oil leak. You may notice oil under the car or on other parts under the hood. You might also notice a burning smell while driving. » LEARN MORE: Signs of a bad valve cover gasket

Can I drive with a valve cover gasket problem?

A vehicle can still be driven with a leaking valve cover, but the leaking oil will cause other problems over time. Spark plug wells can fill with oil, causing a misfire. Oil dripping on coolant hoses will cause them to become soft and eventually burst. And the smell of burning oil will become more noticeable in the cabin.

How often do valve cover gaskets need to be replaced?

Repair intervals vary greatly by vehicle and driving conditions. The valve cover gasket does not wear like a tire or a ball joint, but eventually the gasket's rubber or cork will degrade to the point where it leaks.

How are valve cover gasket issues diagnosed?

It is easiest to spot oil leaks when they are new or fresh. The technician may clean the fluid around the leak and direct you to come back later to confirm where the leak is coming from. With more progressed oil leaks, the technician will also add a dye to the oil. After the vehicle has been driven with the dye, a UV light will be used to pinpoint the leakage and recommend repair.

GMC G3500 Valve Cover Gasket Replacement Cost by Year

The average cost for a GMC G3500 Valve Cover Gasket Replacement is between $160 and $217 but can vary from car to car.

GMC Valve Cover Gasket Replacement Cost Estimates

The average cost for a Valve Cover Gasket Replacement is between $160 and $217 but can vary from car to car.

Quality Car Repair.
Fair Prices.

Get a fair price estimate on GMC G3500 Valve Cover Gasket Replacement in your area - honored at RepairPal Certified locations.

Valve Cover Gasket Replacement

Jump to:Cost estimates by year Commonly associated repairs Cost estimates by vehicle

What is a valve cover gasket?

What are the symptoms related to a bad valve cover gasket?

Can I drive with a valve cover gasket problem?

How often do valve cover gaskets need to be replaced?

How are valve cover gasket issues diagnosed?

How is a valve cover gasket replaced?

The technician will remove the valve cover, remove the old gasket, and clean all gasket surfaces before installing the new valve cover gasket. On some engines, removal of the intake manifold, or other major parts may be required in order to access the fasteners on the cover. After completion, the area will be checked for leaks.

RepairPal recommendations for valve cover gasket issues

A high-quality gasket should be used. Often, the OEM gasket will have the best seal. Some manufacturers suggest adding special silicone to specific areas to ensure a proper seal. Where applicable, a valve clearance inspection and adjustment should be performed.

Can I replace the valve cover gasket myself?

The vast majority of valve cover gaskets only require simple tools to replace. But the procedures vary wildly from car to car. Prior to ordering parts or attempting this repair yourself, look online for guides on how to replace the part in your specific vehicle. Some cars will require significant disassembly of the top end of the engine in order to remove the valve cover. In these cases, it's often best to let a professional mechanic handle the job.