300xs year differences

**V-bottom** · 10-04-2018, 09:46 AM

I am not a chemist so I can't dispute your math but the marina on my lake checked with the Klotz rep and they assured me that if I used the recommended mixture it would easily take me from 89 to 91.5. In fact the marina ordered the product for me and said they would stand behind the product. I wouldn't want to rely on using it all the time. I am leery to use any additive products but the odd occasion I figure it gives me the peace of mind that I have tried my best to meet the recommended 91.

**NICE PAIR** · 10-04-2018, 09:47 AM

Looks like I have some call's to make ......... Likely to my float plane buddy. ;-)

Thanks everybody for your input. NP

**FMP** · 10-04-2018, 10:06 AM

Read all the fine print you need, if you use mmt in the concentration in the can and mix the max ratio you get the results. Only fine print I found is using it with low 87 gets you 89+, just under the 3 numbers or 30 points. The concentrated race brand has more and yields higher. It's proven to work on knock sensor engines with self tunning, dyno . No knock higher tune absolute dyno gains.
If you choose to buy a brand which has the lowest concentration you'll get low increases such as 1 number.

**rocketman6965** · 10-04-2018, 10:34 AM

2006 and later will adjust to lower octane fuels. More specifically by serial number but I don't know the serial number range. My DBR kit MUST run 91 MINIMUM or it goes !!KABOOM!! At least that is what I was told. I was a little leery of removing air sensor from plenum and leaving it out in the open LOL.

Originally Posted by miagonz85

Any idea of the year that update was introduced?

**XstreamVking** · 10-04-2018, 11:34 AM

How did you come by this info? Not doubting you. Thought I had seen it but couldn't find it again.

**powerabout** · 10-04-2018, 12:07 PM

so a 2006 and later has a knock sensor?

**NICE PAIR** · 10-04-2018, 04:27 PM

Originally Posted by rocketman6965

2006 and later will adjust to lower octane fuels. More specifically by serial number but I don't know the serial number range. My DBR kit MUST run 91 MINIMUM or it goes !!KABOOM!! At least that is what I was told. I was a little leery of removing air sensor from plenum and leaving it out in the open LOL.

Originally Posted by XstreamVking

How did you come by this info? Not doubting you. Thought I had seen it but couldn't find it again.

Originally Posted by powerabout

so a 2006 and later has a knock sensor?

"Interesting" :-)

**XstreamVking** · 10-04-2018, 04:42 PM

I would think a dealer or tech would have a listing of differences from ser # to ser # for the motors. Maybe plug in your ser # into a parts site and see if it has a knock sensor listed in the parts breakdown?

**HydroSkreamin** · 10-04-2018, 05:28 PM

Man, you guys are killing me. No 300 XS has ever had a knock sensor. There is NO COMPENSATION for knock, I don't care what you were told. If you think you have knock sensors on your engine, please post pictures of them.

As far as octane boosters go, yeah, some add a little, but do you want to play chemist and be wrong?? I've done the math on this a few times and it's actually cheaper to carry 10 gallons of good race gas and mix it and know what you have, FWIW.

Your mileage may vary...

**XstreamVking** · 10-04-2018, 05:35 PM

How do they handle it on the 400R?

**rocketman6965** · 10-04-2018, 05:50 PM

I'm an idiot guys. Sorry to mislead you. I had DBR kits in both my 250 and 300. The 250 without DBR could run 87 and has been that way since 2006. My 300XS is a 2014 and clearly states 91 minimum. I only run 93 octane.

Originally Posted by rocketman6965

2006 and later will adjust to lower octane fuels. More specifically by serial number but I don't know the serial number range. My DBR kit MUST run 91 MINIMUM or it goes !!KABOOM!! At least that is what I was told. I was a little leery of removing air sensor from plenum and leaving it out in the open LOL.

**JPEROG** · 10-04-2018, 05:54 PM

Originally Posted by HydroSkreamin

Man, you guys are killing me. No 300 XS has ever had a knock sensor. There is NO COMPENSATION for knock, I don't care what you were told. If you think you have knock sensors on your engine, please post pictures of them.

As far as octane boosters go, yeah, some add a little, but do you want to play chemist and be wrong?? I've done the math on this a few times and it's actually cheaper to carry 10 gallons of good race gas and mix it and know what you have, FWIW.

Your mileage may vary...

Are you sure? lol....

Joe

**2jz** · 10-04-2018, 06:03 PM

Verados have knock sensor.
IMO all that thinking and doing research must have you stressed then you find something that you think might you go and blow motor now ur even more stressed. Leave the boat home and find other alternative. Something to also consider that marina says 85 octane but if they don't get a frequent fuel drop you might be looking at 83 84octane.

**marks86** · 10-04-2018, 06:23 PM

Originally Posted by rocketman6965

I'm an idiot guys. Sorry to mislead you. I had DBR kits in both my 250 and 300. The 250 without DBR could run 87 and has been that way since 2006. My 300XS is a 2014 and clearly states 91 minimum. I only run 93 octane.

My 2012 300xs clearly states 91 octane as well. I only run 93. I said it before. Not a chance I’m willing to take.