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Benefits of a hard break-in discussion #5360488 02/26/20 09:54 AM
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buster Offline OP
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Skip to 3:45 - 7:00




2020 Mazda CX-30
2019 Impreza Sport - OE fill
Re: Benefits of a hard break-in discussion [Re: buster] #5360505 02/26/20 10:06 AM
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ARCOgraphite Offline
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Ill be breaking in a Buick 340 I just rebuilt for a '67 GS340.

See if we can get some non ILSAC Oil in there

Likely again as i always rec 4T motorcycle stuff,

or maybe just SAE30 plus the zdp break in sauce.

I'm all for loading the engine, but not for LONG periods. maybe 3-4 second WOT under 4000 rpm then cool down for a few mins before then next run up.


Last edited by ARCOgraphite; 02/26/20 10:08 AM.

2019 VW Jetta S 6MT OCI#2 7378mi-MOTUL Specific VW508.00+VW Service Filter; '17 Subaru Crosstrek CVT OC#8 60864mi-Subaru Idemitsu 0W20 + SOA Filter
Re: Benefits of a hard break-in discussion [Re: buster] #5360524 02/26/20 10:24 AM
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demarpaint Offline
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Imagine that, he drops the FF on a new vehicle in 500 miles............... hide popcorn I'm going to stick to what I've been doing all along.


God Bless Our Troops

Re: Benefits of a hard break-in discussion [Re: buster] #5360533 02/26/20 10:32 AM
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KrisZ Offline
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Come on! We all know the engineers write the owners manuals (must be in their spare time) and we also know engineers only do what's best without compromising anything.

These people are not affected by company policies, management, market, marketing pressures etc. They just sit in their little cubicles and engineer away, and write owners manuals after that, or maybe during their lunches, I'm not sure ,as internet lore has not touched on that yet.
wink


2015 Grand Caravan 3.6L - 35k miles.
2006 Mazda 3 2.0L - 186k miles
Re: Benefits of a hard break-in discussion [Re: buster] #5360534 02/26/20 10:32 AM
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Danh Offline
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So, Honda for one is absolutely wrong. They load their engines with molybdenum (from assembly lubes) at the factory, suggest leaving the factory fill in for a normal service interval and tell the owners to avoid hard acceleration for the first 500 miles. I’ve done this with several new Hondas and never had an oil consumption issue let alone a “destroyed” engine from my neglect. And I really doubt Honda is the OEM running the engines at WOT when they come off the assembly line.


Last edited by Danh; 02/26/20 10:34 AM.
Re: Benefits of a hard break-in discussion [Re: KrisZ] #5360558 02/26/20 11:07 AM
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BMWTurboDzl Offline
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Originally Posted by KrisZ
Come on! We all know the engineers write the owners manuals (must be in their spare time) and we also know engineers only do what's best without compromising anything.

These people are not affected by company policies, management, market, marketing pressures etc. They just sit in their little cubicles and engineer away, and write owners manuals after that, or maybe during their lunches, I'm not sure ,as internet lore has not touched on that yet.
wink



Don't forget the corporate legal department


“It took untold generations to get you where you are. A little gratitude might be in order. If you’re going to insist on bending the world to your way, you better have your reasons.”

435i
Re: Benefits of a hard break-in discussion [Re: buster] #5360603 02/26/20 11:45 AM
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andyd Offline
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just bought a HF predator 6500 w. Owners manual sez to break in engine with a 3 hr run at a "moderate" load. Oil spec is 10w30. Recommended OCI is 20 hrs. I'm changing oil after break in. Just to see if there is any glitter. There was little if any visible glitter from my first Predator. grin2


'16 Camry LE STP synth 0w20 and STP filter. the Fridge

1994 Ranger ,the Rat, 5w30 dino, STP filter

'16 Camry SE, Valvoline HM 0w20 and OEM filter
Thick oil is better grin2
Re: Benefits of a hard break-in discussion [Re: buster] #5360624 02/26/20 12:17 PM
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4WD Online Confused
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Meh … nothing wrong with following the builders owners manual when it comes to break in.

Been doing that for decades (do like an early 1st change) and never wound up with an oil burner even with engines that internet “know it alls” say always burn oil.

Re: Benefits of a hard break-in discussion [Re: 4WD] #5360633 02/26/20 12:24 PM
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Malo83 Offline
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Dump the FF at 500 miles, Xcellent idea. thumbsup thumbsup thumbsup

Re: Benefits of a hard break-in discussion [Re: buster] #5360644 02/26/20 12:36 PM
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buster Offline OP
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How come this is still a debated topic in 2020? And why is Dodge the only company that states in their manual that brief full throttle acceleration helps ensure a good break-in? Last, why am I so obsessed with this topic? LOL!


2020 Mazda CX-30
2019 Impreza Sport - OE fill
Re: Benefits of a hard break-in discussion [Re: Malo83] #5360658 02/26/20 01:09 PM
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demarpaint Offline
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Originally Posted by Malo83
Dump the FF at 500 miles, Xcellent idea. thumbsup thumbsup thumbsup

I think so too.


God Bless Our Troops

Re: Benefits of a hard break-in discussion [Re: buster] #5360672 02/26/20 01:36 PM
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BrocLuno Offline
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Are we breaking in a race engine, or a street engine ... Are we trying for 600 mile life at 800 HP, or 300K at 150HP ...


Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.
Re: Benefits of a hard break-in discussion [Re: buster] #5360675 02/26/20 01:42 PM
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Ws6 Offline
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My Z06 had very specific instructions. None of it involved WOT until 1000 miles.

Also, the rings are pressed against the walls most when the engine is in vacuum. Engine-braking from a sensible rpm is the way. Not revving to the stratosphere.

During break-in of my Z06, I noticed for the first few hundred miles, a lot of soot on the tail pipes, as well as oil consumption (about 1/2 a quart total, in 1K miles).

After about 7-800 miles, the soot stopped. I tracked oil usage after the first change I did, at 1K, and it never used another drop that I could tell.

The engine definitely needed breaking in. Beating on it wasn't the way it was to be done. When you do this, you spike surface and system temperatures beyond normal maxes, because the increased friction of rougher surfaces will do that. After the engine is broken in, these surfaces play nicer. The same happens with the transmission, and the diff gears. The real bug in the ointment is the brakes...which should be broken in HOT for some systems (carbon fiber rotors/ceramic pads are a perfect example). Gears like a gentle break in, brakes like a hard break in, and engine components vary, but I have found a sensible break in is best (driving in moderate city traffic, and engine braking, is a great method, actually).


2019 CX5 Grand Touring Reserve
Re: Benefits of a hard break-in discussion [Re: buster] #5360679 02/26/20 01:49 PM
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buster Offline OP
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A GM engineer that at one time was a member on this site said high load was good for break-in. You can do that without high RPM. I think that is most ideal.


2020 Mazda CX-30
2019 Impreza Sport - OE fill
Re: Benefits of a hard break-in discussion [Re: BrocLuno] #5360680 02/26/20 01:49 PM
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buster Offline OP
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Originally Posted by BrocLuno
Are we breaking in a race engine, or a street engine ... Are we trying for 600 mile life at 800 HP, or 300K at 150HP ...

He was talking about street/stock cars.


2020 Mazda CX-30
2019 Impreza Sport - OE fill
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