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Hello everyone,

Just got my first Xterra two weeks ago and I couldn't be happier. I've wanted one since the first commercials in 99 and 00, 15 years later and I finally have one.

I have some pretty specific questions about performance and maintenance when it comes to the area I live in. I live and play in the high country and was wondering about two issues. First, running synthetic vs conventional oil, It came from the dealership loaded with conventional, would it be a good idea to switch over to synthetic? Second, what octane fuel should I really run in Nissan's V6 4.0L engine? I'm getting conflicting answers from people that don't own Xterra's and I don't personally know anyone who has one. I know that running a higher octane at high altitude can carbonize the heads in some engines but not all. My parents run 85 in their BMW and F150 because of this, but I run 91 in my wife's Audi because I was told to since it has a turbo. I don't know if a turbo really needs the higher octane, I just know it eats oil like a little monster.

Thanks for the help
 

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Welcome! IMO, I wouldn't waste the extra money on higher octane fuel, I've never noticed any difference in my area or your area (except for a bit better MPG in your area). My preference is to run synthetic oils and enjoy a bit longer change intervals.

Which part of CO are you from? My in-laws are from the Crawford/Hotchkiss area, I've spent a lot of time there.
 

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I use full syn oil for longer change intervals (have always done it myself) and better flow at -40* that we usually get every winter. No need to worry about what it came with and change-over.
I have not noticed a difference when running higher octane fuel, so I don't use it. Try a few tanks of it - if you notice a difference, use it - if not, use the cheaper. At higher altitudes, higher octane becomes useless, to a point. At sea level you will not find 85 octane available - usually 89 is sold as regular. I my area (~3500 ft) 87 is sold as regular.
 

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I use mid grade gas... does it make a difference? don't know, but thats why I picked the middle one. Same thought with the oil so I use a sythetic blend. Im a middle of the road kinda guy.

Welcome from Colorado!
 

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Welcome from Fort Collins. I have been running synthetic for a few years in all my vehicle and have been very happy with the results (mostly the longer change intervals) and in the Xterra I always ran regular unleaded and never had any problems at all, had a Bullydog Tuner and tried running mid grade unleaded with the mid grade tune, but regular always seemed to work better.
 

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Discussion Starter #9
Thank for the warm welcome and the great advice. I live in Grand Junction at the moment but I'm trying to move out near castle rock to be closer to family and better career opportunities. I'm slowly changing out things on my xterra, k&n, led interior lights, more will come down the road. The goal is to purpose build for Flyfishing. I want to get a Titan rod vault but the the price is a little steep.
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Welcome from Colorado Springs.

I run the lowest grade, 85, in mine.
As for oil, I use conventional.
 

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Welcome from Castle Rock! Grew up on that side of the state, but have been on the front range for many years now.

I run mid-grade fuel and Mobil-1 synthetic in my X, engine is running nicely at 98K miles.

I drool every time I see a Rod Vault. Then reality kicks in when I see the price tag. Then I think I can save some money by adding my own aluminum tubing to their reel housing and slap one of their nose cones on it. Could do this for $100. Then I read this (which is posted on the info page for the reel housing):
"The Titan Rod Vault is patented and protected against design infringement . Individual parts must not be ordered and used to imitate design for personal or commercial use."

Long and short, you have to pay them $400 for the aluminum tubing they use :angry5:

Can't wait for someone to come up with a fairly priced competitive product.
 

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