Do New Cars Still Require a Break-In Period?

[Eros]

Hello, I have another interesting question

Is there a break in period for the new Honda Jazz?
What did you pay attention to in the first few thousand miles with your new jazz, what is your advice to new buyers?

Thanks in advance

[Mr Onion]

I always treat any new car with "care" as tyres, brakes, bearings etc etc all need to bed in. Regularly check fluids and pressures, don't brake sharply (unless needed of course) and remember that you have to get used to the car as well as the car getting used to you.

The first 1000 miles is usually enough.

[Karoq]

Modern cars do not require the stringent 'running in' that they did years ago, due to vastly improved engineering and lubrication.
Bear in mind that you have very little control over the petrol engine of any hybrid, you should avoid prolonged maximum revs.
Tyres and brakes take at least  200-300 miles to bed in. So drive carefully for that distance, giving yourself a bit more distance in which to stop.
Sorry Mr Onion, you get there first while I was typing.

[sportse]

There is only one small paragraph in the owners manual about running in.

It just says take things a bit easier for the first 600 miles - no maximum braking/acceleration.

Also trying to vary the cruising speed is often recommended - not sitting for ages at one speed. I picked mine up and went straight onto the motorway to drive the 30 miles home, so varied between 50/60/70 where possible rather than sitting at 70 the whole way.

[John Ratsey]

It's also possible that Honda programme limits into the ECU which allow an increase in performance as the operating hours increase.

[embee]

There's a subtle difference between "need" and "benefit from".
Modern engines are developed to tolerate pretty much any use from new, bearing in mind there is always some form of cold/hot test on the production line (cold = motored, measures friction signature to check everything is built correctly, hot = running to check fuel/ign system functions).
Modern manufacturing methods provide surface finishes which will "bed in" relatively quickly and in a controlled manner, resulting in a durable condition for an extended service life with minimal oil consumption and blowby etc.
However they still benefit from a systematic running regime during early stages of use, generally gradually increasing speed+load conditions over a period of something like 10hrs. In a manually operated vehicle (manual shift or auto) you can control this to a decent extent, in a fully auto controlled hybrid type vehicle it's not as easy.
I would always recommend gradually working up the speed+load envelope progressively over the first couple of hundred miles/kms, just as a sensible precaution. You are unlikely to cause any harm however you drive it, but you can contribute to a beneficial process.
It is important to use high speed+load towards the end of any "break-in" process if at all possible to achieve the best condition of the engine. I once worked on a light aero (piston) engine brand, and their operating manual said "don't baby your engine", worth considering.
Most car engine manufacturers have some sort of "piston scuff" test. The engine is built with minimum clearances, gets it's production type running schedule as normal, but then it gets tested by starting from cold and immediately taking it up to max power for 10 or 15mins typically. It must survive this with no damaging piston/ring/bore scuffing. It's not the best way to break-in an engine but they will survive it.