Odin

Be careful! Once you reach US soil the engine becomes fragile like a biscuit and you’ll need to keep it below 4K for another 1500kms!!

Shall we all agree that the info in the U.S. manuals are just a load of bs?

No short drives. Varied rpm not sitting constant on the speed limit on highways, light to moderate load not above 7000rpm for 1500km/932mi is the way to do it. Of course getting up to temperature before engine speeds above 4000rpm as always👌🏻

stressless

That is the most definitive answer that I have seen on this post. Thanks @prof.nano. Anybody else with a US spec car that has observed the warning going out after 932 miles?

stressless

Thanks @Odin all good stuff.

TRAKCAR

I'm sure break in by the book is ideal, but my 0.02c:

Picked up my 991GT3RS cars in germany and all went on track within 300 miles (Stuttgart - Ring), one with zero Km on the clock, trailered it to the Ring.
But I always warm up the car and cool down the car gently. The first sessions, I keep it away from readline and lets say they are super smooth laps, just feeling the car out for a few sessions.
But the next day I consider it broken in. I'll say that generally I don't use the last few hundred RPM anyway and I always drive in manual.

I always change the oil after 1000Km and do corner balance and setup.
I always change the oil every 6 or so track days.
Each 12K miles, new uprights, wheels locks, plugs, belts, pdk oil and all filters.

Sold my 2016 GT3RS with 40K miles, sold my 2019 with 20K miles.
The 2019 had a leaky gearbox and they replaced it after 15K miles, the 2016 broke a coolant pipe at 20K miles. Besides that, they never went to the dealership for anything else and were flawless.

gregturek

Any ideas why the GT4 breakin recommendation is so much different than the GTS (4K for 2,000 min?

stressless

Not a clue! Would you buy different manual writer or different lawyer? LOL

prof.nano

@Odin "Be careful! Once you reach US soil the engine becomes fragile like a biscuit and you’ll need to keep it below 4K for another 1500kms!!
Shall we all agree that the info in the U.S. manuals are just a load of bs?
No short drives. Varied rpm not sitting constant on the speed limit on highways, light to moderate load not above 7000rpm for 1500km/932mi is the way to do it. Of course getting up to temperature before engine speeds above 4000rpm as always👌🏻"

Hahahaha! Yes, I plan to resume the US style break-in procedure when she touches down on the East Coast, because the laws of physics, which I am very familiar with, are subtly modified in the US of A, lol.

For my 3000+ km of Euro Delivery driving I ~followed AP's break-in procedure. Under 4k for first 500 km, then increased rpm by 1k every 200 km. All drives were > 1 hr with varying revs. Obviously, kept her below 3k rpm until oil reached 190 C.

I did an oil change at Manthey at ~2800 km the day before taking my car on the Nordschleife. BTW, I met MrJWW and his purple GT4 RS at Manthey during a tire testing program he was conducting. You can see my 4 RS on the lift towards the end of his video chronicling this experience.

Odin

@pro.nano sounds like you did it to perfection. I did mine over 3 days driving home from the dealer. Not sitting at constant engine speeds all in 3 goes. It’s incredible how fun the car is and the sounds it makes even when driving sensibly with all buttons disengaged. The blue light reminding me to respect the drive in period went away exactly at 1500kms/932mi. From there…🔥🔥🔥

How was James IRL to talk to? Seems a nice guy and very enthusiastic and knowledgeable on camera. I like his style and videos!

gregturek

Neither. I live with a very good writer, and I’m not fond of most lawyers. 😉

My engineer brain is having a hard time making sense out this nonsense.

prof.nano

Thanks! It was such a memorable experience. RE James, he was very friendly and enthusiastic. We exchanged compliments on each other's 4 RSs. Much of our time was spent chatting with members of his team because he was busy recording a video with some Manthey personnel. He had his de-winged and duck-tailed GT3 with him. He's a very good driver.

greatfox315

Can any others corroborate the 932 mile (1500km) break-in requirement for US market cars? I, too, don't buy that the 992 GT3 and GT4 RS break-in periods are different from one another.

Sklambda

it’s 932miles I recently finished my break in and the small run-in light that pops up right after you start the car is gone after you hit that mile mark.
Enjoy your car it’s awesome!!

greatfox315

Amazing! The 3000km listed in the manual must be a mistake, or a lazy carryover from the standard GT4.

xliang

Anyone noticed an 'increase' in power after break in? 1500km.

I have a source at dealer that says that there is built in power limiter for break in period. - this is because i felt the car was not on par with gt3 power...eg. same 500hp engine.

thanks,.

GrantG

No. There is probably a very small power increase as the engine breaks in, but nothing programmed to change at 1500km (other than the Break-in reminder message going away)