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I am going to buy new car Mitsubishi Pajero Sport (Model: MBS MT 4x4). I've heard stories of people 'breaking in' engines for the first few hundred or couple thousand kilometers using methods such as:

• Not driving above 80 km/h.

• Varying the revs more than usual throughout the entire range.

• Keeping the revs below 2.5k.

Is 'break-in' necessary on modern cars? If so, how should I 'break-in' a new engine?

Thanks

Pᴀᴜʟsᴛᴇʀ2
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Joy
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  • The correct answer to this question is always to follow the manufacturer's recommendation.

    The "break-in" procedures you describe originated long ago, and served a legitimate purpose, but enormous advances in engineering, metallurgy, and lubricants mean much of that advice is obsolete for new cars.

    Note that I am not talking about a classic car with a newly rebuilt engine, I'm talking about a new factory vehicle.

    Most manufacturers I've seen do not recommend any special break-in procedure, they just tell you to take it a bit easy for the first X miles.

     – barbecue Jan 03 '16 at 18:23
  • Consider that there's lots of other classic advice which once made sense, but is now meaningless. Smacking the carburetor to free up a stuck butterfly used to be common advice, but it doesn't make sense on a new car. – barbecue Jan 03 '16 at 18:27
  • @barbecue - The problem is, unless you have a motorcycle, most manufacturers don't give you break-in instructions. There are still things you should and should not do during break-in ... old school or not. – Pᴀᴜʟsᴛᴇʀ2 Jan 03 '16 at 21:59
  • Thanks a lot to your entire guide to give me usefully recommendation – Joy Jan 04 '16 at 02:29
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    @Paulster2, in my experience most manufacturers do provide some sort of "break-in" instructions in the owner's manual. It is usually something along the lines of "Don't drive like an idiot for the first 500 miles" – barbecue Jan 04 '16 at 20:38
  • @barbecue - You've got me there :-) – Pᴀᴜʟsᴛᴇʀ2 Jan 04 '16 at 20:43
  • Interestingly, the specific details do vary, but mostly the advice tends to be that for the first 500 miles or so, you should avoid hard acceleration, engine braking, and highway cruising. – barbecue Jan 04 '16 at 21:08

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