[solved]New car running

Can u drive a brand new car on highway ? some say that it should run 5000KM before its taken on highway to run continously!!

That is called run-in period. It varies among cars, for Logan it is 6000kms. You can drive it on the highway, as long as you don't strain the engine.

for a good life, dont strain the engine till your first 2-3 services

Advice.
Dont go on highway atleast for 1st 1000 kms.

Its because in this period all parts try to get used to your driving style.
So continue changing gears, varying speeds so they can work perfectly in all conditions.

IN highway you'll be using constant speed which will make the car more acquitted to that.

But in USA you could drive car out of showroom straight on highways for a longer time period at say 65-70 miles/hr( based on speed limit) and there is no wear-in period for cars (Engines)??

cars are cars wherever in the world you go. where did you get this info about US cars??

I heared like that.

Don't know much about the US scene, but it is always better to play safe. It is your vehicle and the damage is yours. In a new engine, there will be more wear than normal and that is the reason we were asked not to strain at the beginning. You could see lot of tiny bits present in engine oil during first service.I'm not able to explain properly, will clarify by Friday.

=> Thread Marked as Solved.

RoadRocket

CC,
I will complete it for you.
During First Oil Change, when you drain the old oil, you will see some metal bits sticking to the Drain Bolt. These metal bits are caused due to friction. So you may notice metal bits on the bolt even during 2nd or 3rd oil change depending on the Friction between the Engine Components.

Oops! I forgot to reply. Thanks sudeepd for the reply.

@jj, hope you are clear now.

You are Always Welcome CC.
I too hope jj has no doubts now.

just to add a little bit more...

a. Older generation engines required to be "broken in" first and then run in gradually before you could actually get the best out of them - e.g the best engine revs, fuel economy etc. etc. - this was present on premier padmini's where you'd get almost 15-16kmpl by the 5th year by which time you had to sell the car.
Breaking in is where you have the components rub together to get perfect mating - e.g. between piston rings and liners, valve poppets and seats etc. - this process requires atleast 100hours and should the engine overload in this period you can failure of these components. What's most important to remember is the bearings - these need the most time to break in. Don't forget to include mating gear meshes as well.
Running in is wearing the components during normal use. Normal being the operative word here and based on usage (e.g. more starting and stopping causes more wear etc.) is defined as 1000-1500kms after breaking in. Bear in mind that a car having 50,000kms on the clock would still be running-in in some way or the other. the rough edges and burrs are removed and the parts are fitted and mated to each other. This is where an interchange of parts is unacceptable because running in patterns can NEVER be predicted. Being in the field myself I have seen that a perfectly run in piston ring can slice your finger off!

b. Newer Generation engines are pre-broken in, and therefore only require running-in which is why they ask you to take it easy after delivery of a brand new car. The components although broken in are still rubbing against each other for a perfect fit and rough edges are still present. therefore should you strain the engine and associated components at that time, you still risk unevenly wearing out the engine.
Contrary to what was said before - running an engine in at a constant speed is much better than running in in the cities because the load component is steady - it's like saying you don't want to give a backpacker with a new knee replacement too much change in the weight of the backpack.
Yes, city driving will ensure that the gear box runs in at all gears properly, but what happens if you can't get to 5th gear? and stuck in traffic in the 1st only?