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Discussion Starter #1 (Edited)
hmmm.

what's the proper way to break in an engine? uhhhh... i did not refer to the owners manual...doohh! :huh:

we got the truck on mile 18, drove on the highway (75 mph) about an hour to get it home then went on an eight hour highway trip (80mph)
our gas milage at it's hightest was about 14.5, but now it settled into a combined 11 mpg (at 85 mph high average).
i can live with 11 mpg, but i'm wonderin' did i not baby the engine enough on the break in or am i just a lead foot (and a dunce)?

the 2000 wranger I6 4.0L that was advertised 15 to 19 on the dealer sticker gets about 12 mpg with me, ranging about 8 to 14 mpg.

:teethmast
 

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pluckyew said:
hmmm.

what's the proper way to break in an engine?

we got the truck on mile 18, drove on the highway (75 mph) about an hour to get it home then went on a eight hour highway trip (80mph)
our gas milage at it's hightest was about 14.5, but now it settled into a combined 11 mpg (85 mph).
i can live with 11 mpg, but i'm wonder did i not baby the engine enough on the break in or am i just a incurable lead foot?

:teethmast
Nissan advises that for the first 1200 miles you should not exceed 4000rpm, or run at constant speeds for an extended time. The break in procedure is in your owner's manual. I would say the 8 hour run at 80mph was not a good idea. If you really want better mileage, dump the 50weight oil for some 10W-30, and run at 70mph instead of 85mph.
 

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outahere said:
Nissan advises that for the first 1200 miles you should not exceed 4000rpm, or run at constant speeds for an extended time. The break in procedure is in your owner's manual. I would say the 8 hour run at 80mph was not a good idea. If you really want better mileage, dump the 50weight oil for some 10W-30, and run at 70mph instead of 85mph.

I have noticed the mileage really starts falling off past 70mpg. I am gettting 15.5mpg driving 70mph on the Hwy.
 

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Opps...I've been driving normally in mine. If I need to pass someone, I'am not going to coast past them under 4k RPM and I usually run 80 on the interstate. 400 Miles on her so far...
 

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If you have to break it in on the freeway, at least stay in the right hand lane. This will force you to change speeds up and down as you adjust to people merging onto the freeway. It is my understanding that long periods at a constant rpm are not good for seating the piston rings (oil and compression), and is not good for breaking in the camshafts.
 

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I would suggest that during the break in period that everyone dump their oil much sooner than 3,000 miles. I will change mine every 1,500 miles for about the first 5,000 miles. It's not a great expense doing it yourself and by not useing expensive synthetics that cost over $4.00 a quart.
 

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Just took mine in at 1K miles for her first oil change. Free oil changes for the life of the truck was part of my purchase agreement. It didn't state how often I could do it so I figure at least once more in the next 2K miles and then every 3K miles thereafter.
 

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pluckyew said:
hmmm.

what's the proper way to break in an engine? uhhhh... i did not refer to the owners manual...doohh! :huh:

we got the truck on mile 18, drove on the highway (75 mph) about an hour to get it home then went on an eight hour highway trip (80mph)
our gas milage at ........
:teethmast
You know Pluck, I've heard people say to "break'um in like you're gonna drive'um" and it sounds like you may have done that! I have always been to chicken to do it that way so I try to follow the manufacturer's suggestions.

Some of these same people seemed to have pretty quick cars though and don't recall they had any more problems than the rest of us so maybe you will be the quickest of the quick. Good Luck!
 

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Break'em in like you drive'em?! As cool as that sounds i dont see how that could be good on the motor or drive parts. If any one has any luck in breaking in there truck like this let me know.
 

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Batman229 said:
Break'em in like you drive'em?! As cool as that sounds i dont see how that could be good on the motor or drive parts. If any one has any luck in breaking in there truck like this let me know.
I've had 17 new vehicles in the past 17 years and I always broke them in like I stole'em. Several of these vehicles I've kept up with and one of them has over 170k miles on it and it still runs like new.........Give'em hell......
 

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JetForeman said:
I've had 17 new vehicles in the past 17 years and I always broke them in like I stole'em. Several of these vehicles I've kept up with and one of them has over 170k miles on it and it still runs like new.........Give'em hell......

I Completely agree! On my 2002 WS6 Trans Am I beat the snott out of her for the 1000 miles and it was one of the stronges stock motors the dyno shop had seen! An average 2002 trans am usuall puts down 300-305 RWHP
mine bone stock with about 2000miles put down 324.8 RWHP and 339RWTQ!
So drive it like you stole it!!! :cheers: I know when i get mine thats how i will do it!
 

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I'm with Jet! I always break them in like I'm going to drive it. I do try to not hold a constant speed for a long time (maybe 10 miles) and I try to avoid full throttle when it is cold. Other than that.. Drive it!

Tony B
 

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I broke my Dakota in aggressively - it has been solid for over 191K miles.

I drive 75% highway miles - the service guys recommended "stomping" on it occasionally from your cruising speeds - like passing a car.
 

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I also was always told to break in an engine all the way to their limits..even..if you will never drive it like that afterward.
That's how I've broken in all my cars/trucks up including my little 4cyl POS in my 01 Frontier. NEVER had engine issues with any of them.
 

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Guys,

Really you should break these trucks and any other vehicle in per manufacturers recommendations. The engineers that design the vehicles know what they are talking about. This is even more important on Japanese vehicles (generally) as their engines are typically built to closer tolerances than some other manufacturers' engines. This is one reason that the Japanese engines are typically more reliable. All the parts fit much tighter. I have seen Yamaha and Suzuki outboard boat engines still gaining top end rpms after 30-40 hours because of it and manufacturer break-in for these engines is 10 hours. This means that at 30-40 hours are they are still getting broken in...very tight tolerances. Why put undue and unneeded stress on the internals if you don't need to? This can lead to accelerated engine wear during break-in. You should definitely vary the rpms a lot for proper break-in. It is not damaging to run the rpms over 4k OCCASSIONALLY, just do not sustain high rpms for very long at all.
 

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dman said:
Really you should break these trucks and any other vehicle in per manufacturers recommendations. The engineers that design the vehicles know what they are talking about.
I agree... I provided the previous link for interesting reading. It is not how I break in an engine. I've always broken in engines per the manufacturer's recommendations. I have had the Titan over 4k rpms, but just VERY briefly when passing someone...
 

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stevnmd said:
That is an interesting article stevnmd. My Titan had 12 mi. on her when I opened the door for the first time so, according to that article, my window of opportunity was already 60% gone. I can guarantee the next 988 mi. were put on according to the manual. Well maybe a couple of short bursts but under 4k for sure. Guess I'm doomed to leaky rings and less power than I could have had but think I will go with Nissan on this one too! Like the man said 'very controversial'.

SON
 
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