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fm4th

GAS

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fm4th

I just got a used Malibu 07 VLX and I'm wounding what type of gas do I put in it? **87-89-93** The boat has 60 Hour on it what is the next service thing I have to do???

Thank you for your time...

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1FootDan

89 Octane as per Indmar specs.

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Malibudude

Here is a link that will help.

Monsoon 340, manual states 89 while many of us just use 87 w/o any issues. Using lower octane will not hurt the engine.

HH use 89

LS1 use 92

According to Indmar, the short of it is you can safely run 87 octane if the fuel is fresh and you plan on using it up in a very short time (for example over the weekend). The reason behind using 89 octane is that most boats sit for several days or weeks at a time and the fuel will degrade with a result of loss in octane.

I'd change all the fluids oil/tranny clean the air/spark arestor and change the fuel filer. Most of this should have been completed w/ the 20hr service as well. When I buy used I like to simply change all the fluids.

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WAKE-RIDER-01

My family uses 87 in our 340 monsoon, no problems yet.

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MalibuNation

Sunoco 93 octane for my LS1. 200 bucks to fill up my boat and diesel truck. You only live once.

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BlastRlxi
89 Octane as per Indmar specs.

Plus1.gif

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atxfletch
Here is a link that will help.

Monsoon 340, manual states 89 while many of us just use 87 w/o any issues. Using lower octane will not hurt the engine.

HH use 89

LS1 use 92

According to Indmar, the short of it is you can safely run 87 octane if the fuel is fresh and you plan on using it up in a very short time (for example over the weekend). The reason behind using 89 octane is that most boats sit for several days or weeks at a time and the fuel will degrade with a result of loss in octane.

I'd change all the fluids oil/tranny clean the air/spark arestor and change the fuel filer. Most of this should have been completed w/ the 20hr service as well. When I buy used I like to simply change all the fluids.

I just ordered an 08 23LSV with a Hammerhead. Does this mean if I keep the fuel fresh that I can use 87 octane as well?

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NorCaliBu

This topic comes up every year. :Doh: Do you really think that Indmar would recommend 89 octane if there was no benefit? The manufacturer recommends 89 (except for the LS's), why not use it? Is $4 - $5 per tank that big of a deal? You can afford a $50-80K boat but not 10¢ a gallon more for better fuel? Crazy.gif

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Malibudude
Here is a link that will help.

Monsoon 340, manual states 89 while many of us just use 87 w/o any issues. Using lower octane will not hurt the engine.

HH use 89

LS1 use 92

According to Indmar, the short of it is you can safely run 87 octane if the fuel is fresh and you plan on using it up in a very short time (for example over the weekend). The reason behind using 89 octane is that most boats sit for several days or weeks at a time and the fuel will degrade with a result of loss in octane.

I'd change all the fluids oil/tranny clean the air/spark arestor and change the fuel filer. Most of this should have been completed w/ the 20hr service as well. When I buy used I like to simply change all the fluids.

I just ordered an 08 23LSV with a Hammerhead. Does this mean if I keep the fuel fresh that I can use 87 octane as well?

With regards to the HH Indmar recommended to me that you use a 89, as it's a higher performance engine than the monsoon. So yes use the recommneded, with the monsoon I've used both 87 and 89 and no difference in gas consumption or power.

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bu2007vlx

Per the specs I also use 89 with my Monsoon. In the past with my other boats I had to use 91 with my Black Scorpion engine.

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Chef23

I have been using 87 with no problem.

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dhcomp

I'd be careful using 87 in the hammerhead.

I have a LT1 vette motor, and it smokes and runs like $hit on 87, when it requires 89

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VinRLX
This topic comes up every year. :Doh: Do you really think that Indmar would recommend 89 octane if there was no benefit? The manufacturer recommends 89 (except for the LS's), why not use it? Is $4 - $5 per tank that big of a deal? You can afford a $50-80K boat but not 10¢ a gallon more for better fuel? Crazy.gif

Or figure if you go through 500 gallons in a season, the difference is ~$50. Fifty bucks for the YEAR sounds like a pretty good maintenance program/insurance policy to me. I use 89.

But, of course, I'm one of those guys who changes the impeller before it self-destructs. Crazy.gif

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NorCaliBu
But, of course, I'm one of those guys who changes the impeller before it self-destructs. Crazy.gif

Me too. :) Or at least I try to, sometimes they go away unexpectedly. Cry.gif

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VinRLX
But, of course, I'm one of those guys who changes the impeller before it self-destructs. Crazy.gif

Me too. :) Or at least I try to, sometimes they go away unexpectedly. Cry.gif

I've heard that if you almost sink your boat, it tends to cause undue pressure on the impeller. Tease2.gif

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NorCaliBu
I've heard that if you almost sink your boat, it tends to cause undue pressure on the impeller. Tease2.gif

I don't know about that... :unsure: ...but I can tell you that it will kill a bilge pump. Yes.gif

:lol:Cry.gif:lol:

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68Slalom
Here is a link that will help.

Monsoon 340, manual states 89 while many of us just use 87 w/o any issues. Using lower octane will not hurt the engine.

HH use 89

LS1 use 92

According to Indmar, the short of it is you can safely run 87 octane if the fuel is fresh and you plan on using it up in a very short time (for example over the weekend). The reason behind using 89 octane is that most boats sit for several days or weeks at a time and the fuel will degrade with a result of loss in octane.

I'd change all the fluids oil/tranny clean the air/spark arestor and change the fuel filer. Most of this should have been completed w/ the 20hr service as well. When I buy used I like to simply change all the fluids.

I just ordered an 08 23LSV with a Hammerhead. Does this mean if I keep the fuel fresh that I can use 87 octane as well?

With regards to the HH Indmar recommended to me that you use a 89, as it's a higher performance engine than the monsoon. So yes use the recommneded, with the monsoon I've used both 87 and 89 and no difference in gas consumption or power.

I confused, the HH is not an LS1 based motor? I thought the only real difference was the bore/stroke in the HH vesus the monsoon. Monsoon 350ci HH 383ci? :unsure:

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68Slalom

Oh yeah, and the gas station near my work just raised the price of gas to $3.80 for reg. and $4.56 for prem. I swear they are doing it to be the highest priced gas station around, they should be over $5.00 during the middle of summer Whistling.gif

Total B.S.

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Malibudude
Here is a link that will help.

Monsoon 340, manual states 89 while many of us just use 87 w/o any issues. Using lower octane will not hurt the engine.

HH use 89

LS1 use 92

According to Indmar, the short of it is you can safely run 87 octane if the fuel is fresh and you plan on using it up in a very short time (for example over the weekend). The reason behind using 89 octane is that most boats sit for several days or weeks at a time and the fuel will degrade with a result of loss in octane.

I'd change all the fluids oil/tranny clean the air/spark arestor and change the fuel filer. Most of this should have been completed w/ the 20hr service as well. When I buy used I like to simply change all the fluids.

I just ordered an 08 23LSV with a Hammerhead. Does this mean if I keep the fuel fresh that I can use 87 octane as well?

With regards to the HH Indmar recommended to me that you use a 89, as it's a higher performance engine than the monsoon. So yes use the recommneded, with the monsoon I've used both 87 and 89 and no difference in gas consumption or power.

I confused, the HH is not an LS1 based motor? I thought the only real difference was the bore/stroke in the HH vesus the monsoon. Monsoon 350ci HH 383ci? :unsure:

Just quoting what came from Indmar, but yes that was my understanding as well.

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