How to "break in" a 5.7L HEMI? (Moved) - Chrysler 300C Forum: 300C & SRT8 Forums
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Old 12-17-2008, 05:08 PM   #1 (permalink)
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Lightbulb How to "break in" a 5.7L HEMI? (Moved)

Just got my 300C as many of you know, it only has 73 miles. Now I know with a 4-stroke jetski you should ride it pretty hard to make sure the rings seat real good, but what about a car? Will it be better for me to drive it like I stole it, or normal, or go into complete grandma mode?
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Old 12-17-2008, 05:40 PM   #2 (permalink)
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no drive it nice and easy
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Old 12-17-2008, 06:17 PM   #3 (permalink)
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I agree with the nice and easy part for the first few hundred miles and varying the speed and rpm a bit. The problem your going to have is once this baby gets running a little freerer is keeping your foot out of it. Intoxicating is a understatement.
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Old 12-17-2008, 06:22 PM   #4 (permalink)
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Sounds good,e Nice and light is what I'll do. So say 500 miles I should be free to let her rip right?
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Old 12-18-2008, 12:47 AM   #5 (permalink)
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Quote:
Originally Posted by DodgeMan View Post
Sounds good,e Nice and light is what I'll do. So say 500 miles I should be free to let her rip right?
This is from the '07 manual. I was very pleased to read that "brief full-throttle..." part. I took full advantage, "within the limits of local traffic laws" ...of course!

Quote:
Drive moderately during the first 300 miles (500 km). After the initial 60 miles (100 km), speeds up to 50 or 55 mph (80 or 90 km/h) are desirable. While cruising, brief full-throttle acceleration, within the limits of local traffic laws, contributes to a good break-in. Wide-open throttle acceleration in low gear can be detrimental and should be avoided.
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Old 12-18-2008, 05:09 AM   #6 (permalink)
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nah

Break In Secrets--How To Break In New Motorcycle and Car Engines For More Power

read that link and then tell me what you think.

Break in is an old myth. Modern manufacturing and assembly has eliminated the engine needing a genuine break in procedure.

There are driveline parts that still benefit, that's why the first gear limitation.

We have a professional 3rd gen engine builder in the family and he says the rotating assembly is either right or not, and the rings are seated in a very short time, like minutes.

Drive it hard and you'll actually have more power.
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Old 12-18-2008, 06:59 AM   #7 (permalink)
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Drive it hard and you'll actually have more power.
This is true, I have seen the proof from two mates, David and Ashley who bought the exact same TICKFORD AU XR6 ute at the exact time and both did their own thing, the mate Ashley who drove it like he stole it actually got more RWHP at a local dyno day, this was a year + after owning them, mind you his ute had more rattles too
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Old 12-18-2008, 10:31 AM   #8 (permalink)
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Quote:
Originally Posted by wog boy View Post
This is true, I have seen the proof from two mates, David and Ashley who bought the exact same TICKFORD AU XR6 ute at the exact time and both did their own thing, the mate Ashley who drove it like he stole it actually got more RWHP at a local dyno day, this was a year + after owning them, mind you his ute had more rattles too

I can also vouch for different break-in procedures -- my wife would not let me break in her Charger the way it needed to be done. She would rarely do the "brief full throttle" recommendation from the manual either. I bought my 300 two months after the Charger and I broke it in the "HEMI" way LOL.

Both cars have the exact same Mods and we both use the same Exxon station for 93 octane gas. Per the Predator, ST KR on both cars max at 1.5. I can walk her Charger whether in Drive or AutoStick.

I understand no two cars are alike, but I have to think that the "easy" break-in my wife did on her Charger factors into my 300 being quicker than hers.
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Old 12-18-2008, 10:54 AM   #9 (permalink)
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Do the verdict is to break it in hard?
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Old 12-18-2008, 11:22 AM   #10 (permalink)
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from the 2008 300 manual:


ENGINE BREAK-IN RECOMMENDATIONS
A long break-in period is not required for the engine in
your new vehicle.
Drive moderately during the first 300 miles (500 km).
After the initial 60 miles (100 km), speeds up to 50 or 55
mph (80 or 90 km/h) are desirable.
While cruising, brief full-throttle acceleration, within the
limits of local traffic laws, contributes to a good break-in.
Wide-open throttle acceleration in low gear can be detrimental
and should be avoided.
The engine oil installed in the engine at the factory is a
high quality energy conserving type lubricant. Oil
changes should be consistent with anticipated climate
conditions under which vehicle operations will occur.
The recommended viscosity and quality grades are
shown in Section 7 of this manual. NON-DETERGENT
OR STRAIGHT MINERAL OILS MUST NEVER BE
USED.
76: THINGS TO KNOW BEFORE STARTING YOUR VEHICLE
A new engine may consume some oil during its first few
thousand miles (kilometers) of operation. This should be
considered as a normal part of the break-in and not
interpreted as an indication of difficulty.
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