Frequently Asked Questions

Q:  With today’s rising gasoline prices, what octane rating is recommended for my Crusader engine?
A:  Crusader fuel injected engines are calibrated to operate on 87 octane fuel and maximum performance is obtained  when using this fuel.  The ignition timing set by the factory requires the use of a high-quality lead free regular gasoline with an octane specification of (R+M/2).


Q:  What is Crusader's policy on the use of Ethanol?
A:  The implementation of ethanol-based fuel is spreading rapidly throughout the United States .  The end user of our engines might well be concerned regarding the use of this fuel.  As such, Crusader Engines provides the following policy statement regarding the use of this fuel.


This notification addresses the use of ethanol fuels IN CRUSADER ENGINES ONLY.  It does not address the use of ethanol fuels in vessel related components such as boat gas tanks, boat fuel lines, boat fuel filters, etc.  The boat owner is STRONGLY ENCOURAGED to contact the boat builder regarding the suitability ofethanol fuel usage in their vessel.


Ethanol blended fuel rated E10 or less is acceptable to use.
Fuels rated higher than E10 SHOULD NOT BE USED.

Ethanol fuels rated higher than E10 could potentially damage the engine and/or present an unsafe boating condition.  Damage to the engine resulting from the use of ethanol fuel rated higher than E10 is not covered by the warranty.  For more information about ethanol, click here. For Crusader's official policy on ethanol, download here.


: What kind of oil should I use in my Crusader engine(s)?

A: When the average temperature is above 50 degrees F., use a good quality SAE 15W-40 "SJ". Below 50, use SAE 5W-30 "SJ"


Q: What kind of coolant should I use?

A: GM tests all their engines using long life DEX-COOL coolant. Therefore, Crusader recommends DEX-COOL or any good extended life coolant (pink/orange in color) mixed 50% DEX-COOL to 50% water for engines that have a closed cooling system. More than 50% coolant can contribute to overheating. Do not mix or substitute DEX-COOL with traditional silicated coolant (green in color).


Q: What is the best cruise rpm for my Crusader engines?

A: Best cruise rpm is 75% of W.O.T.

Q: What is the "On-Board Spare Parts Kit" ?

A: A kit, put together by the Crusader technicians, that contains the parts most commonly needed in most emergency situations. Examples: Belt, fuel filter, spark plugs, relay, ...etc. Contact your Crusader dealer or the Crusader Master Distributor for your area to order the correct kit for your particular engines.

Q: In a boat with a 260 Volvo 5.7 engine and Volvo outdrive, can the engine be successfully replaced with a 350 Crusader engine, using the same Volvo outdrive? Thanks, Bob E.

A: Yes. Check out the Power Pack option. Your closest dealer can assist you.

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