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I heard the rumors going around when I first got my truck that they had a break-in period at 3500 miles. People reported better performance and mpg after that mark. Well I never really noticed a difference. My truck just recently rolled over the 7500 mark and it not only feels like there is more power all of a sudden, but I've been getting consistently 3-4 mpg better. Nothing about the way I drive has changed, although the temp outside is been between 5-10 degrees cooler. Anyone else experience this? Maybe its the cooler weather, but it sure is a nice change.
 

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Read your manual , it's like 500 miles with out going over 55 and no hard acceleration and thats all for motor break in. That is minium requirement which most people fail to do. The brake lines take 200 miles to break in with no hard pumping if you can help it. It is possible to break a line.

That is all the GM asks that you do.
It is true that after like 3000 to 5000 miles the motor becomes broke in and loose where the cylinders are not tight. You will notice a bigger gain in proformance and fuel economy all due to a broke in engine.

I remembered when i first test drove a Colorado, i thought it was junk and the motor had no balls, but after 3000 miles or so it came to life.

Treat it nice for those first 1000 miles and it will turn out well.
 

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Never heard of a break in time for brake lines. There is a time where the pads need time to seat into the calipers, and drums and rotors need to get tempered, but not the lines themselves.
 

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ive seen break in periods both ways...Baby it/drive it like you stole it...i guess driving it hard under break in will seat the valves better and keep the original performace there...but who knows whats better...personaly i beat on mine when i got it :)
 

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hmmm i didn't know about the 55 mph thing, i drive it to work at 70-80 mph everyday on the turnpike; only have 3500 miles now. Oh well, aways seems the people who beat on their trucks get the most out of them.
 

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In actuality, every moving part in any vehicle is affected by break-in procedures! From the engine to wheel bearings to brake dics, any part that is brand new will benefit from a good break-in. Most important is engine acceleration and decceleration, braking and steering also benefit from good habits.

I believe it is most beneficial to vary the engine speeds the first 500 miles, by not maintaining a constant speed for too long a period, and for you folks with standard transmissions....avoid "lugging" the engine by choosing an improper gear selection at given speeds.

My personal opinion on the 500 mile subject is that the 55 mile per hour limit seems a bit conservative, as a gradual increase to 65-70 mph for a short period seems O.K., as long as it is achieved without any sudden acceleration.

My '97 Sonoma ZQ8 gave me 116,000 solid miles of service, and I can say a careful break-in was the contributing factor.


 

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My old boss got his s2000 up to 155mph right off the lot after he bought it. It had 8 miles on the odometer.

I broke my spec v in pretty eaisly for the first 3000 miles, that was hard...but after that it saw the redline at least 3 or 4 times a day, and hard, hard track use once a month.

So I said the hell with it for the colorado. Thats why they have a warrenty.
 

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Hey guy's if you would take time and :rtfm: :rtfm: it's in there take a gander at page 2-16. I really feel sorry for those who can't even admit they don't konw or don't understand somthing instead they get that big male adittude and say "the hell with instructions". Ya know it's ok to read how things work once in awhile. I've been through my manual a ton of times looking for awnsers. I see alot of people posting up on things that are all covered in that manual. Take to bed with ya, read it, ya might find something interresting. Put down the porn, tell wife or signifigant other maybe later. It not that hard to do. Take to work just read it so i don't have to read any nore posts on how to break in the engine.

Kc i believe i was reading to fast book says "linings" WETF they are. must be pads.
 

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You can take your manual and use it for toilet paper.

Every time I broke in a vehicle hard (motorcycle or car) it ran noticeably better than vehicles broken in via the recommended procedure. I'd take it easy for about 50 miles, then let 'er rip. And I've had over 20 vehicles in my time. When I bought my '89 S-10, I did a burn-out leaving the dealership parking lot. It had 6 miles on it. And I did have to replace the engine. But that was at 106,000 miles and only after someone sugared my gas tank.
 

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I was burnin' rubber the first day I got my truck. Couldn't resist. Besides.....I believe in the drive it like you will normally.
 

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Hee hee....that's the spirit eh folks!? I think Exousia's got a point though..you cannot go wrong following the manuals advice, and it is better to stay on the safe side, however...a lot of folks don't even know where in the manual, that break-in procedures can be found! That's the first place I usually look when flipping through the book!

I basically go by GM's recommendations, but on occasion...I will gradually increase the speeds to 60 or 70...only for a short time though. I have about 40 miles on my truck at the moment, and it will be seeing slightly higher cruise speeds when I hit the 250 mile mark.

Nowadays, with all aluminum blocks and heads...it is really important that these procedures are adhered to. Aluminum can be affected by heat and heat dissipation moreso than cast iron, and I would rather go a little slower now, than not go at all!!!
 

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Take it easy for the first 500 miles, and be sure you're
varying the speed and it is not 500 miles using the CC.
After that, drive it like you stole it... :D
 

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Modern vehicles do not require a break in period because of tight clearance tolerances, modern alloys, and modern oils. Drive it like you normally would when it's new. Don't baby it.
 

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sxipro said:
Modern vehicles do not require a break in period because of tight clearance tolerances, modern alloys, and modern oils. Drive it like you normally would when it's new. Don't baby it.
If it is not required then why do they recommend it in the owners manual?
 

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racerXdjn said:
sxipro said:
Modern vehicles do not require a break in period because of tight clearance tolerances, modern alloys, and modern oils. Drive it like you normally would when it's new. Don't baby it.
If it is not required then why do they recommend it in the owners manual?

It's just a reprint that they never eliminate. Dates back to the 1936 Buick Roadmaster.
 

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Danny45 said:
racerXdjn said:
sxipro said:
Modern vehicles do not require a break in period because of tight clearance tolerances, modern alloys, and modern oils. Drive it like you normally would when it's new. Don't baby it.
If it is not required then why do they recommend it in the owners manual?

It's just a reprint that they never eliminate. Dates back to the 1936 Buick Roadmaster.
:D :D That Roadmaster is still going strong
 

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One thing I have noticed right off the bat, is how quickly my 5 Cylinder warms to operating temps, versus my '97 Vortec 4300. Here in Houston, especially on the freeways...on my way to work...it is very difficult (read almost impossible) to stay around 55mph, as everyone is either going around you, on your rear bumper, or verbally cursing all sorts of expletives at you!!!!
 

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Sab said:
One thing I have noticed right off the bat, is how quickly my 5 Cylinder warms to operating temps, versus my '97 Vortec 4300. Here in Houston, especially on the freeways...on my way to work...it is very difficult (read almost impossible) to stay around 55mph, as everyone is either going around you, on your rear bumper, or verbally cursing all sorts of expletives at you!!!!

Oh yeah, my truck gets warm a LOT faster than my old 89 S10 4.3. A LOT!
 
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