2015 ZR450 Fuel Options

[uwhusky]

Saw another guy post about this and I've always been curious.

I run a 2015 ZR450 engine. I was told by the sales guy to run 91 octane, 10% ethanol but that was only because that's the highest in my area available readily. I'm also high altitude.

My other options is 88 octane, no ethanol.

What should I be running?

[gun-driver]

This is what it says on page 27 of the 2015 PCM Owner's Operation and Maintenance Manual in the reference section of this site.

NOTICE: PCM Fuel Injected engines are calibrated to operate on and provide optimum performance when using fuel with at least an 87 octane fuel rating. PCM’s engine control module incorporates Adaptive Learn Technology to ensure optimum engine performance is obtained when using fuel rated higher than 87 octane. If a slight pinging is heard during acceleration and the proper octane fuel is being used, it is considered normal. If a constant, heavy knock occurs, the engine should be evaluated by a PCM Marine Engines Premier service technician.

ATTENTION: For optimal performance and reliability, the ZR450 application requires the use of premium 93 Octane fuel

[uwhusky]

Well that's interesting because I've been running 91octane all the time. I can't get 93 but it seems to work fine with 91.

[Waveslayer]

We have the 550 and no marinas carry anything over 87, no issues or knocking so far

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