FAQs

If you have questions about our Recreational Marine products and capabilities, we have the answers. Check out some of the most common ones here.

Don't see your question listed below? Contact us, and we'll help.

How often should maintenance be performed on my Ilmor MV8 engines?

Ilmor MV8 engines are to be serviced after the first 25 hours of operation, and then every 50 hours or annually thereafter, by your authorized service center. Please consult the maintenance guide in your owner's manual.

Something on my engine has failed. How do I know if it's covered under warranty?

We recommend you contact your dealer or authorized service center to verify whether your repair is covered under Ilmor's limited warranty.

What type of fuel should I run with my Ilmor engine?

For US/CAN: 87-93 Octane unleaded. Do not use leaded gasoline.

Non-US/CAN: 98 RON minimum octane major brand of unleaded regular or premium without alcohol.

Please note: If gasoline with alcohol must be used, be sure to periodically inspect the complete fuel system for leaks. Consult your dealer or authorized service center for long-term storage or winterization procedures. Gasoline containing alcohol levels higher than 10 percent ethanol or methanol (E10) are not to be used in the MV8 engines. E85 fuels are not to be used.

Can I use reformulated or oxygenated fuels?

In certain areas of the United States, reformulated (oxygenated) gasolines are required. The two types of "oxygenates" used in these fuels are alcohol (ethanol) or ether (MTBE or ETBE), and both of these reformulated gasolines are acceptable for use with your Ilmor engine. However, gasoline containing alcohol levels higher than 10 percent ethanol or methanol (E10) are not to be used in the MV8 engines. E85 fuels are also not to be used. Please be sure to consult your owner's manual and maintenance guide for additional information, or consult your authorized service center for assistance.

Can I use octane fuel additives?

Ilmor does not recommend octane booster for the products we make as we have not tested its compatibility with our engines, nor can we verify the octane rating of the fuel after it is mixed. Please bear in mind that use of any fuel additives that are not recommended by Ilmor may affect your warranty coverage.

What type of oil should I use?

To obtain optimum engine performance and to provide maximum protection, use Ilmor recommended special blend synthetic as noted in the Owner's Manual, available at your authorized service center. The oil filter should always be changed with the engine oil. Please be sure to never mix oils, or any other engine fluids when servicing the engine.

Why do I overfill every time I change the oil, even when following the capacity indicated in the manual?

The owner's manual will detail the approximate capacity of the entire lubrication system. When changing oil, a small amount of oil remains in the oil lines throughout the system, which is why it's difficult to add the indicated amount of oil in the engine without overfilling. You should always add oil when the engine is level. It is important not to overfill or under fill the crankcase. Fill to the correct level by using the indicator marks on the dipstick. Please consult your authorized service center for any additional assistance.

When is the best time to change my engine oil/gear lube?

Ilmor Marine recommends that owners change the oil and gear lube during regularly scheduled maintenance intervals, after the first 25 hours of engine operation, and then every 50 hours or annually thereafter, by your authorized service center. We also recommend an oil/gear lube change at the end of the season, prior to winterization or extended storage, to avoid long-term accumulation of contaminants in the system.

How do I winterize my Ilmor MV8 engine?

Because of the complexity of the winterization procedure, we highly recommend you take your Ilmor products to an authorized service center for winter preparation. Additionally, please refer to your owner's manual for additional information. Failure to winterize your engines properly may result in severe engine damage, which will affect your warranty.

What should I do after running my engine in salt water?

Ilmor Marine engines should be flushed with freshwater after each saltwater use for maximum corrosion protection. A salt neutralizer like Salt-Away® should be used. Also, the engine should be sprayed down with corrosion protector, minimizing the amount of spray on the belts. Consult your dealer or authorized service center for additional information and assistance.

Can I use auto parts on my Ilmor marine engine?

Electrical, ignition, and fuel system components on Ilmor Marine engines are designed and manufactured to comply with U.S. Coast Guard rules and regulations to minimize risks of fire or explosion. Use of replacement electrical, ignition, or fuel system components, which do not comply with these rules and regulations, could result in a fire or explosion hazard and is prohibited by federal law. Please note that use of any non-authorized part may also affect your warranty coverage. Consult your authorized service center for additional information and assistance.

What kind of spare parts should I carry on my boat?

Anything can happen on the water, so it's best to be prepared. Consult your dealer or authorized service center for recommendations.

Will modification of my engine affect the warranty?

Ilmor Marine warranty coverage does not apply to damage or failures caused by use of an accessory or a part not manufactured or sold by Ilmor. Consult your dealer or authorized service center for additional information or assistance.

Can I do my own maintenance and repairs?

Ilmor MV8 engines and driveline products are complex and technologically advanced machines, requiring special tools and expertise. As your safety is extremely important to us, we recommend only Ilmor-certified technicians perform maintenance or service work.

Where is the engine serial number located?

The engine serial number is located on the starboard side of the engine, affixed onto the side of the intake plenum. Additional details can be found in your owner's manual. Please contact your authorized service center for more information.

Where can I buy Ilmor MV8 engines and drives?

Please contact Ilmor Marine for product information and pricing.

What engine platform is the Ilmor MV8 based upon?

The Ilmor Marine MV8 engines are based upon General Motors' line of engine products.

Are Ilmor MV8 engines emissions certified?

All MV8 engines are U.S. EPA, California-ARB and EU-RCD emissions compliant. 

Which propeller should I choose for optimum performance with my Ilmor engine?

Selecting the best propeller requires information about your boat size, engine performance and use.Consult with your boat manufacturer, dealer or authorized service center to assist you with choosing the appropriate propeller for your boat.

Where can I get an Owner's Manual and maintenance schedules?

Ilmor MV8 Owner's Manuals are available for download in our Warranties / Manuals section of this website. The maintenance schedule is included as part of the Owner's manual.

How do I obtain installation information, including drawings?

Installation information, including drawings, is available from Ilmor Marine upon request. Should you have additional questions, please contact us or your authorized service center.

Where can I learn more information about my warranty?

Full details of the Ilmor Limited warranty coverage for MasterCraft products are available in our Warranties / Manuals section. Should you have additional questions, email us on our Contact page.

Do I have to register my engine for warranty? If so, how do I?

Ilmor requires that every engine be registered for warranty. This allows us to contact you in case of any future service updates, as well as maintain up-to-date records on your product quality. Your engine should be registered by your selling dealer. If you have not received your warranty card within 30 days, please contact your authorized dealer or service center for assistance.

Where is the engine serial number located?

The engine serial number is located on the starboard side of the engine, affixed onto the side of the intake plenum. Additional details can be found in your owner's manual. Please contact your authorized service center for more information.

Where can I buy Ilmor Marine parts?

Ilmor MV8 parts are currently available through authorized dealers and service centers.

I'd like to order parts, but can't find the part numbers. What should I do?

Please contact your dealer or authorized service center to determine which parts you need to order. You will be required to provide the serial number of your engine.