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2015+ Shelby GT350 Mustang
Break in miles
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<blockquote data-quote="ANGREY" data-source="post: 16404928" data-attributes="member: 188865"><p>If you ask 10 different engine builders about break in you'll get 10 different opinions. The trick is finding common themes among them. I've even watched an engine builder say that after about 30 miles, the rings are set and the tolerances in all the rotating components only wear and grow from that point to the death of the motor.</p><p></p><p>Having said that, there's other parts of the car that in my opinion are just as important or more important for break in. Namely the differential and the transmission. If you swap out a ring/pinion set from Motive or FRPP or Yukon or US Gear, they'll all tell you to take it easy for a period of miles until the gears can break in properly (unless you get the isotropic finish treatment). Some recommend 500 miles.</p><p></p><p>The same is true for a clutch or certain mating parts of the transmission.</p><p></p><p>Over the years, the best compilation of advice is this:</p><p></p><p>1) Don't operate the vehicle at all during break in until it's fully up to operating temperature (this is good to continue for the life of the vehicle but absolutely crucial during break in).</p><p></p><p>2) Avoid long sustained rpm cruise control (stop and go street driving varying the rpm up and down from idle to 3-4k is preferable).</p><p></p><p>3) Don't flog it to redline (more for the components I listed above than the motor).</p><p></p><p>4) Change the oil at the end of the breakout period and drive it like you stole it from that point forward.</p></blockquote><p></p>
[QUOTE="ANGREY, post: 16404928, member: 188865"] If you ask 10 different engine builders about break in you'll get 10 different opinions. The trick is finding common themes among them. I've even watched an engine builder say that after about 30 miles, the rings are set and the tolerances in all the rotating components only wear and grow from that point to the death of the motor. Having said that, there's other parts of the car that in my opinion are just as important or more important for break in. Namely the differential and the transmission. If you swap out a ring/pinion set from Motive or FRPP or Yukon or US Gear, they'll all tell you to take it easy for a period of miles until the gears can break in properly (unless you get the isotropic finish treatment). Some recommend 500 miles. The same is true for a clutch or certain mating parts of the transmission. Over the years, the best compilation of advice is this: 1) Don't operate the vehicle at all during break in until it's fully up to operating temperature (this is good to continue for the life of the vehicle but absolutely crucial during break in). 2) Avoid long sustained rpm cruise control (stop and go street driving varying the rpm up and down from idle to 3-4k is preferable). 3) Don't flog it to redline (more for the components I listed above than the motor). 4) Change the oil at the end of the breakout period and drive it like you stole it from that point forward. [/QUOTE]
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Break in miles
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