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Discussion Starter · #1 ·
Was considering a 600SDI but am now wondering if it is true that Doo
recommends using 91 octane fuel. This kinda comprimises the fuel efficiency
somewhat. :dunno:

Comments, Thankss,

KR
 

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I have this model and used 87 octane and it was great on milage and power. I think some places said use 91 and others 87. But I was told by many to use 87.
 

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87...........no issues on mine........ :div20:
 

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I've always used the highest octane gas. It states 91 octane on the tank but I do believe it adjusts for lower octane. I don't mind spending the extra 20 cents per gallon while getting 18 to 20 mpg with mine. Supposedly the engine detonation dutunes it a little for the lower octane. Apparently lower octane is OK too.
 

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The computer will detect and adjust the timing for 87 octane gas, it's all I ever use. That said it will detect the higher grade and adjust for it obviously. It will run happily all day long on either, but you should get max performance on high octane, save a few dollars with the 87 and lose just a little, not enough difference to warrant the extra money in my opinion.
 

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mileage related and covered by warranty. Show me another SDI with the kind of miles I put on without the rings "popping" as you put it :cn:
 

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Originally posted by rob@Sep 28 2005, 09:34 AM
mileage related and covered by warranty. Show me another SDI with the kind of miles I put on without the rings "popping" as you put it :cn:
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Good point,,, but using high grade gas could possibly extend the life of the rings though. Of course its prob cheaper to run 87 and have to put new rings in it a little bit sooner. :div20:
 

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In this case, ring wear has nothing to do with octane. If there were an octane prob the piston would show it first (detonation). On rebuild the piston tops were fine.

Also, both our sleds were losing compression from the rings, but the crank seal was what actually "popped" and took out a cylinder in both sleds. The ring problem isn't as bad as the crank seal problem.
 
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