How to break in a new car (Mazda3)?

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Kelvrick

Lifer
Feb 14, 2001
18,438
5
81
Avoid hard stops? What? Are you telling me that a car was manufactured that will have a decreased life if when driving away from the stealership someone pulls out in front of me and I need to hit the brakes HARD?

Who knows. Maybe the hard braking was thrown in to account for new brake pads/tires that need to be bedded or have their mold coating worn off.

I feel like minor machining variances and luck of the draw (or pull from parts cart) when your engine was built, and ongoing vehicle maintenance will matter most on what happens down the line. But really just dumb luck within the range of how well a specific engine was designed and/or built.
 

Blanky

Platinum Member
Oct 18, 2014
2,457
12
46
Whatever the manual says. Everything else is internet wisdom, aka bullshit. Ignore anything about hard brake ins, ignore all the absolute silly nonsense about breaking in brakes, it's just a whole lot of complete garbage.

Manual = mazda > everyone else.

Same advice goes for any new car.
 

LTC8K6

Lifer
Mar 10, 2004
28,520
1,575
126
Avoid hard stops? What? Are you telling me that a car was manufactured that will have a decreased life if when driving away from the stealership someone pulls out in front of me and I need to hit the brakes HARD?

Why do people always go overboard?

It says to avoid hard stops. It doesn't say one emergency stop will ruin anything.
 

pauldun170

Diamond Member
Sep 26, 2011
9,139
5,074
136
The manufacturer already provided the info. Don't waste your time with internet forum nonsense with the same tired old link. Just read your manual.

BREAK-IN PERIOD
No special break-in is necessary,but a few precautions in the first 600 miles should be observed.
• Do not race the engine.

• Do not maintain one constant speed, either slow or fast, for a long period of time.
• Avoid full-throttle starts.
• Avoid unnecessary hard stops.
• Do not drive constantly at full-throttle or high engine rpm for extended periods of time.

If you want to ignore your manual and drive it like the you stole it, then go ahead, It won't matter.

In the end, you are driving an appliance designed to last over the manufacturers estimated lifetime of the vehicle.

Is that pulled from the manual?


If my googlenessosity is googly...Yes


Avoid hard stops? What? Are you telling me that a car was manufactured that will have a decreased life if when driving away from the stealership someone pulls out in front of me and I need to hit the brakes HARD?

 

Nessism

Golden Member
Dec 2, 1999
1,619
1
81
:thumbsdown: That is complete bullshit. Every bike I've ever bought said to keep the rpms under a certain amount for a certain number of miles. The newer BMWs actually electronically limit it for you. Not everyone who buys motorcycles is a total squid and motorcycle manufacturers know this. They don't make these recommendations because they are concerned with their customers "wadding up the bike straight off the showroom floor." I've ridden plenty of demo models with more than 150hp that I KNOW this is not the case.

Also squids typically buy Yamaha R1s and Suzuki GSXRs and Japanese bike dealers would sell a bike to anyone, even unlicensed riders, so to say the manufacturer cares if the customer wads up their bike is just ridiculous. They want to make sure the bike is broken in properly to minimize the chances of warranty claims later on.

If anything, the break-in procedure is probably more critical for motorcycle engines than car engines because they rev so much higher.


If you think the recommendation to keep the rpm's down on a new motorcycle is based strictly on what's best for the engine then you are an idiot. The mfg'ers guidelines include a heavy dose of conservatism aimed at the rider getting accustomed to the vehicle before exploring the upper reaches of the tach.

Race engines are broken in on the dyno and I can assure you they are NOT babied for hours on end keeping the rpm's low on a fresh engine. The rings need pressure to assure they seat properly and the break in focuses on this. Throttle load is progressively increased and the duration of the power pulls is increased progressively. The entire process does not take the equivalent of thousands of miles or road use like your owners manual may suggest.

Piston aircraft engines have probably the most pure break in instructions since human safety is at stake if it's not done properly. Feel free to educate yourself but in a nutshell, the engine uses effectively full power for takeoff and then throttle back to about 75% during early flight hour usage. Read this about "don't baby the engine" http://www.jetairgroup.com/2012/09/11/advice-on-break-in-procedures-for-a-piston-aircraft-engine/

Best thing you can do for a fresh engine is use the throttle liberally. This is not to suggest you should thrash the thing, just accelerate in around town driving using a good bit of throttle to load the rings.
 

Ferzerp

Diamond Member
Oct 12, 1999
6,438
107
106
Race engines are broken in on the dyno and I can assure you they are NOT babied for hours on end keeping the rpm's low on a fresh engine

Tell me exactly how long you think your average "race engine" is expected to last?
 

pauldun170

Diamond Member
Sep 26, 2011
9,139
5,074
136
Tell me exactly how long you think your average "race engine" is expected to last?


Race engines are broken in hard on the dyno and last hours running all the horspowah between teardowns.

That's why whenever I buy a new car, I pull the engine out and break it in on a dyno. Especially after tearing down the engine and putting in top shelf components.

That's why my Camry doesn't burn oil. Would have done the same with my wife's Mazda6 but she had to go to the mall.



My buddy followed the pansy factory procedure. While his car doesn't burn oil either but dyno and stuff

Real talk.
 

Nessism

Golden Member
Dec 2, 1999
1,619
1
81
:thumbsup: Yes, I agree with you.

Hey JulesMaximus, what do you do for a living? Just wondering, because it's clear you don't know anything about engines. Have you ever held a wrench in your hand at all? Do you take your vehicles in to the dealership for oil changes?
 

JulesMaximus

No Lifer
Jul 3, 2003
74,472
867
126
Hey JulesMaximus, what do you do for a living? Just wondering, because it's clear you don't know anything about engines. Have you ever held a wrench in your hand at all? Do you take your vehicles in to the dealership for oil changes?

I don't know anything about engines? I know enough to not listen to you.

This is me not ever holding a wrench in my hand.



Here is the bike not starting after I didn't service it (adjusted valves and replaced timing belts).
https://www.youtube.com/watch?v=9r8HgNt1ZpM

I've read countless interweb stories about breaking in engines as you describe but I've come to the conclusion that most of the people writing those stories are just regurgitating something they've read. Nothing I have read has convinced me that following their advice will result in a better running engine so I'll continue to take the advice of the engineers who designed my vehicle and break them in accordingly.

I've never had a problem breaking in an engine per the manufacturer's guidelines... even motorcycle engines.
 
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pauldun170

Diamond Member
Sep 26, 2011
9,139
5,074
136
Usually you see the standard fair of hard breakin vs manufacturer recommend breakin with the same old links\comments about "race engine".

Occasionally someone takes it up a notch and starts going into the heat cycle conversation.

Rare does someone pull out the "lawyers" card but its not unusual for someone to break out the "damn lawyers" crap.

This has to be the first time I saw someone drag airplane engines into the mix.
Took me back to when I was half my age hanging out at the Airport.


Hopefully OP abandoned thread and is just going to go by the manual.


As for motorcyles, having been around the block...
Breakin has nothing to do with rider safety.
 

Nessism

Golden Member
Dec 2, 1999
1,619
1
81
Here is the bike not starting after I didn't service it (adjusted valves and replaced timing belts).

Wow, congratulations! Posting a video of the vehicle starting after performing routine maintenance! That's quite an accomplishment!

Carry on...
 

NutBucket

Lifer
Aug 30, 2000
27,036
548
126
What am I missing? You tried calling him out on not turning wrenches and when that fails you mock him for only replacing t-belts and doing a valve adjustment?
 

Nessism

Golden Member
Dec 2, 1999
1,619
1
81
What am I missing? You tried calling him out on not turning wrenches and when that fails you mock him for only replacing t-belts and doing a valve adjustment?

JM presents himself as someone lacking knowledge. Adjusting valves isn't rocket science, but it does show some eptitude. Too bad that doesn't translate into him recognizing good mechanical advice from bad.
 

JulesMaximus

No Lifer
Jul 3, 2003
74,472
867
126
JM presents himself as someone lacking knowledge. Adjusting valves isn't rocket science, but it does show some eptitude. Too bad that doesn't translate into him recognizing good mechanical advice from bad.

Following the manufacturers recommendations is good advice. That is what I've recommended throughout this thread.

Fact is that you don't have to stand behind your advice. Mazda does.
 

jlee

Lifer
Sep 12, 2001
48,513
221
106
What am I missing? You tried calling him out on not turning wrenches and when that fails you mock him for only replacing t-belts and doing a valve adjustment?

Yeah, that's about what I got out of it.
 

NutBucket

Lifer
Aug 30, 2000
27,036
548
126
JM presents himself as someone lacking knowledge. Adjusting valves isn't rocket science.
I won't comment on the first part. That's obviously your interpretation.

And you're right, adjusting valves isn't rocket science. Neither is replacing timing belt(s). But, both require some level of mechanical aptitude and certainly qualifies as "turning wrenches".
 

jlee

Lifer
Sep 12, 2001
48,513
221
106
I won't comment on the first part. That's obviously your interpretation.

And you're right, adjusting valves isn't rocket science. Neither is replacing timing belt(s). But, both require some level of mechanical aptitude and certainly qualifies as "turning wrenches".

Neither is building a race engine.
 

JulesMaximus

No Lifer
Jul 3, 2003
74,472
867
126
Lest anyone think performing a valve adjustment on a Desmodromic engine is easy... it isn't.
 
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RampantAndroid

Diamond Member
Jun 27, 2004
6,591
3
81

Uhh, good for you?

The ONLY reason to recommend caution with new brakes is for bedding them. And even then...

Look, a car is manufactured to be safe off the lot. That means it must be able to make hard stops. Period. We live in a world driven by liability, not logic. So it behooves the manufacturer to put stupid stuff like this in the manual. Because then when the car burns oil or something, they can say "well, you must not have correctly treated the car for the first 5,000 miles!"
 
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