View Thread: The Break-in Process.


Sia Bani
Hey fellas...I would like to know what your views are on the whole "break-in" process of newer vehicles. I have a friend that believes the break-in process is a load of crap on newer models that are fuel-injected. Although I agree that most engines these days don't require the extensive breaking-in process as older vehicles, I feel that thoroughly breaking in a new car can provide the car with longer lasting components, better gas mileage (however small that may be), better and longer lasting brake components (you break in your brakes as well). I believe it'll create a solid foundation for the car in the future.

What are your views on this? Also, if possible, let's only talk about sporty cars and other cars that are tuned for high output. (Basically, I'm not talking about an Accord)

I will be linking this thread to my friend shortly! :pd:

Thanks. :rally:

A-Tech
Umm, the accord is pretty sport, 240hp v6 right? not too shabby.

Sia Bani
Goddamnit, I knew I should have mentioned 4 cylinder. And also, about how insanely reliable it is, etc.:dizzy:

Sia Bani
Haha, and if you go to kbb.com and click "sporty" for honda, they won't have the accord listed!


Holy shit...the v6 only comes in Auto! That sucks.

A-Tech
what?! no it doesnt!i drove the 2 door coupe with a manual and the v6 for the car and driver 10 best...

A-Tech
and I dont really care either way about breaking in an engine. But why not? it doesnt take that long and maybe it actually does help? might as well.

Sia Bani
Hmm...kbb has it only coming in Auto with the v6. Weird.

SilveradoPilot
I'm a firm believer in proper break-in. Even if it's "not necessary" for modern vehicles, what have you got to lose? Hold off on the sport mode for at least a few hundred miles, and drive the car gently. Except for a few cycles of medium acceleration immediately followed by some mild engine-braking deceleration to seat the rings properly. After a couple thousand miles, change the oil and filter, check her over carefully, then let it rip!

:drive:


P.S. Rental cars are exempt from this treatment, however. :D

SilveradoPilot
Originally posted by Sia Bani
Hmm...kbb has it only coming in Auto with the v6. Weird.

Honda's website shows the coupe available with V6 and 6-speed in LX trim, but the V6 sedan is only available with automatic. ;)

mustangdriver
I believe in the break in, whether or not I follow it religiously is another question. My Ford manual said nothing about running it hard the first 1000 miles. What it did say was that you shouldn't drive at one constant speed for an extended period. Evidently the engine needs to get used to various levels in the early period and staying at say 75 for a long time isn't good for it.

I still kept it fairly cool the first 1000 miles, no full throttle starts.

scubie02
Well, I've addressed this topic once or twice before, but...

I had a friend who was the head mechanice at a Ford dealership who said the break in period was a bunch of bull, and always advocated "running the crap right out of it" right from the start. He said you needed to get the rpm's up there to set the rings at a higher level, and that if anything was going to go it would go right away, and you wanted it to so it'd be covered by the warranty.

Now me...in THEORY I'd probably try to be gentle and break a car in, but in practice its hard to do with a sporty car, and I always figure you know damn well its had the crap run right out of it by people on test drives before you got it probably. I ran my mustang hard right from the get go and it had somewhere in the neighborhood of 300k miles on it last I knew.

I AM religious about changing the oil, though, and I have gone the extra mile and use synthetic in the wrx even.

scubie02
Oh, and as someone said about the accord 6 cyl--comes w/ a stick in the coupe but not the 4 dr I believe.

911GT2
I just read the Tercel owner's manual a couple days ago (I was bored and had nothing to do in the car) and the breakin procedures were absolutely fucking ridiculous.

get this: no going above 88 kph and no staying at a constant speed for 1600 kms!!! How are you supposed to rack up 1600 kms without going on the highway at all!!

silverTA2002
Well, the break in can't hurt.

But I also doubt flooring the car pretty soon will hurt it either.

If your car has any miles on it, you can rest assured that someone has floored it already.

Isn't that like the first thing everyone does when test driving? "Let's see what it can do."

scubie02
Yep--if you didn't run it hard yourself, someone else probably did on a previous test drive, or bringing it off the boat, or truck, etc.
Not to mention all the horror stories about what they do when you leave it for service...

mustangdriver
Or the valet ;)

Carlos Carrera
Its not the speed, its the RPM. (at least for the engine)
no more than 3000 RPM -- 1000km
no more than 4000 RPM -- 1000km - 5000km
oil change
no more than 4500 RPM -- 7000km
rising the RPM slowy unil it gets 10,000km
oil change.
Do whatever u want after 10,000km.

maybe its too much, but i always do that. The engine will love me later, when she get old :smoke:

Sia Bani
Carlos, random rpms have no significance. It depends on the engine as well as the "constant speed/rpm"

When people consider speed in the break in process, they don't want you to keep a constant speed for an extended period of time. That constant speed translates to a constant rpm.


For example, on a 911 turbo, the suggested break-in process is keeping the car at 3000 rpm on everyday driving, shift at 4000, and do not pass 4200 rpm until 2000 miles. They'd prefer a load on the engine rather than "bogging it" on lower rpms (or almost bogging it).

On an m3, same shit mostly except that they want you to only "occasionaly" step on it passed 1000 miles, up till 4000! Insane, and most likely unnecessary, but that's what they suggest.

eric rxb
Originally posted by preludedriver
Or the valet ;)

:woowoo:

mustangdriver
Thought you'd like that :pd:

Carlos Carrera
Originally posted by Sia Bani

For example, on a 911 turbo, the suggested break-in process is keeping the car at 3000 rpm on everyday driving, shift at 4000, and do not pass 4200 rpm until 2000 miles. They'd prefer a load on the engine rather than "bogging it" on lower rpms (or almost bogging it).



thats what i said.... we advice our costumers that way...
the first km (miles) dont pass certain RPM (depends on the car).
we never use km/h or miles/h that doesnt matter, what matters its the engine speed, or RPM, braking - in means, to let settling the movin' parts of the engine. And that means stay away of abrupt acceleration, or high RPMs.

The 18th Letter
I know this is intended to discuss sporty car, but my car is a 4cyl. auto Accord. :P I break-in my car by keeping it below 3000 rpm, and not go on highway for the first 1000miles. I believe in breaking in the cars gently, not beat the crap out of it from the start.

RedLine
The owners manual for the Grand Prix says nothing about break in, I said srew it because it had 1600km on it when I got it. That means it was a demo. Ive seen executives driving these demos, they run the shit out of them and dont care at all. So I just followed suit and let the car do what it likes. Besides letting a car just puts as a back and forth run to work every day car isnt good for it at all, they need to see the yellow and red once and awile.

Rotary Boy
I allow for 500miles of carefull driving before I get crazy on a car, my Z06 is up to 254. I let it warm up nice and good, then make sure to get it up to about 90 on the freeway, switching it up between the gears to insure the rpms are getting all over the place. for the most part breakin is no longer as important as it used to be, but it doesn't hurt. I am not gonna truly get all over the Ls6 until it hits 500miles though. once it does, watch out

Sia Bani
You guys have no patience!!

FYRHWK1
definitly believe in breakin myself, the factory doesnt usually run them long enough to do more then seat the rings. IMO breakin shoudl be done with organic oil, and many cars come stock with synthetic, so I'd drain the original oil first thing, put int a cheap organic and run it normal for 500 miles. Remember you're also not just breaking the engine in, the transmission and rearend (or front) gears needs to wear down for proper contact so thats deifnitly a reason not to punch it hard. Definitly no hard launches, but running it with alot of throttle gradually won't hurt, in fact the RPMs are a good idea to break it in. Mainly the big thing about not hitting it hard is leeting the metal heat cycle and allowing for the 2 pieces to wear any burrs down, but keeping it at one RPM is definitly a bad idea, you want it to see every RPM, though I guess porsche would know their own cars better.