Engine break in

[SawZallSurgeon]

So I recently purchased a 2026 3.0 Premium MT. When I was shopping around I asked the dealer about engine break in and how long to wait before opening it up and I was told there was no break in. After about a week and a half of owning the car and seeing some posts about the 1,200 mile break in I’m now worried I may have caused issues or voided my warranty if something were to go wrong. It’s on me for not reading the manual and going on the word of a sales rep.

I’ve done maybe a dozen or so hard pulls with the car but not overly beating on it and this wasn’t until about 200-250 miles on the car. But I have gone over the recommended 4,500 rpm quite a bit. I’m sitting at about 725 miles now and wondering how bad could I have hurt the car and/or warranty?

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[razorlab]

If anything, you are "breaking it in" better than most people.

The manual breaking in is more to make sure brakes and such are bed in correctly and if anything is going to quickly fail, it will happen when you aren't flogging the car.

TLDR: Just lawyer copy.

 

[IsThatASupra?!]

Had the same questions about it, check out my post....

https://www.supramkv.com/threads/breaking-in-new-2026-supra.31020/

But honestly don't worry... just make sure you do an oil change at around 1200 (Even then I did mine at around 1800 because I had to make a necessary trip with the car, and the oil looked fine)

Just take it easy for the remainder of the break in (1200 miles).

 

[4ntvings]

you picked up a supra for a reason, enjoy it. had my oil changed at 1200. my 2 cents, you can follow the manual's recommendation from here on, until you feel better

 

[SawZallSurgeon]

Had the same questions about it, check out my post....

https://www.supramkv.com/threads/breaking-in-new-2026-supra.31020/

But honestly don't worry... just make sure you do an oil change at around 1200 (Even then I did mine at around 1800 because I had to make a necessary trip with the car, and the oil looked fine)

Just take it easy for the remainder of the break in (1200 miles).

Thanks, I tried searching for similar threads but yours didn’t show up. I’ll read through yours as well.

 

[IsThatASupra?!]

Thanks, I tried searching for similar threads but yours didn’t show up. I’ll read through yours as well.

no worries at all! Just thought to add for peace of mind : )
You'll see differing opinions on this form but to be honest car manufactures do put that in the manual for legal reasons (so you don't absolutely go ripping it and find out a brake line was ripped and eat a tree)

You bought this awesome car to rip it and enjoy it! So have the peace of mind of knowing these B58s are made really well! So for peace of mind just follow the break-in suggestions but don't let it consume you if you do go over 4.5k rpm once in a while.

 

[SawZallSurgeon]

Thanks, I appreciate the feedback. I see there is a lot of differing opinions on this. I’ll try to keep my foot light for a few hundred more miles

 

[itzTang]

everyone has their own "break in" procedure. Do what you like and what will give you peace of mind. most new cars come broken in already by manufacture. Many on the forum follow a "break in" some rip it right off the lot. all same results. you dont want to be later on down the road "if only i did this or that "

 

[lucky phil]

So I recently purchased a 2026 3.0 Premium MT. When I was shopping around I asked the dealer about engine break in and how long to wait before opening it up and I was told there was no break in. After about a week and a half of owning the car and seeing some posts about the 1,200 mile break in I’m now worried I may have caused issues or voided my warranty if something were to go wrong. It’s on me for not reading the manual and going on the word of a sales rep.

I’ve done maybe a dozen or so hard pulls with the car but not overly beating on it and this wasn’t until about 200-250 miles on the car. But I have gone over the recommended 4,500 rpm quite a bit. I’m sitting at about 725 miles now and wondering how bad could I have hurt the car and/or warranty?

Congrats you've just broken in the engine the best way. I'm not joking.
Phil

 

[concept]

Despite what many people say, the vast majority of production and possibly track-focused engines are NOT broken in at the factory. Here's a compilation of videos in which the creators prove this point.

 

[razorlab]

I ain't watching a boomer blog video that you made where you cherry picked stuff to fit your narrative.

I took BoomerBlob off ignore because I needed some good laughs, and... it's delivering.

Congrats on your staggering amount of 21 YT subscribers though.

 

[concept]

I ain't watching a boomer blog video that you made where you cherry picked stuff to fit your narrative.

I took BoomerBlob off ignore because I needed some good laughs, and... it's delivering.

Congrats on your staggering amount of a whole 21 YT subscribers though.

I guess you are more knowledgeable about engine break-ins than Lake Speed? Maybe he can invite you over to have a debate about it.

 

[razorlab]

I guess you are more knowledgeable about engine break-ins than Lake Speed? Maybe he can invite you over to have a debate about it.

I don't know who that is. I didn't watch your video. That said, I'm pretty sure I have broken in more built engines on the dyno and on the street than you have. So I probably know at least more than you.

Also, why is your response always "I guess you know more than..." Do you say that to your doctor when they tell you something you don't want to hear?

 

[concept]

I don't know who that is. I didn't watch your video. That said, I'm pretty sure I have broken in more built engines on the dyno and on the street than you have. So I probably know at least more than you.

Also, why is your response always "I guess you know more than..." Do you say that to your doctor when they tell you something you don't want to hear?

I meant Lake Speed Jr. who is the son of Lake Speed, a carting legend and later, a NASCAR driver.

LS junior is a
certified tribologist who holds multiple certifications from the Society of Tribologists and Lubrication Engineers (STLE).
His racing roots are from working with Joe Gibbs Racing, where he helped develop high-performance oils used in NASCAR, including Daytona 500-winning formulations.
He is also the founder of SPEEDiagnostix: A company focused on oil analysis and lubrication diagnostics.
As a YouTube educator, he runs The Motor Oil Geek channel, where he breaks down oil viscosity, additive packages, and OEM myths with real lab data—not speculation.

 

[Strych9]

Nismo used to break their JGTC engines in over the course of several days though not gently.

My motocross race engines were "broken in" with 2 heat cycles and went straight to the dyno and I never had a failure.

The NASCAR team I was on used to run the engines in with a heat cycle, then up to a few grand, then up to a few more, then close to 8k, then full tilt. They'd check the oil and let them cool to the touch between runs. My crew chief said "it seemed to work and we'd rather catch a problem at 5 grand than 9 grand."

I overheard Andreas Roos tell someone "you (the manufacturer) know your parts, you know your tolerances. You just have to watch and see what it likes during development." If I have to pick anyone to listen to, it's gonna be him. The P66/3s were done similarly to the NASCAR engines.

TL;DR: let it get hot a few times and then run it like you intend to drive it.

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