New Engine advice

I've just had a new 1.8 petrol engine fitted to my 2004 S40 under warranty. There is nothing in the handbook about how to run in the new engine, so does anyone have any tips or advice? Also, I didn't get any literature or paperwork to say that I had got a new engine fitted, so I don't know the new engine block number to update the registration document with, where can I find this on the engine? I think that I should have had some paperwork, as it's obviously had new belts and everything else which should be recorded. At the moment I am letting the engine warm up thoroughly before accelerating harshly, but I know this is something that you should do with any engine regardless of age! Any tips would be great :) Cheers Matt

There are no longer the rules that were once in place running in by not reving above so many thousand revs for the first so many hundred miles and gradually increasing the revs and the load. Since engine manufacturing tolerances have improved the traditional running in methods are no longer needed. I think the advice is not to thrash the car and use a bit of common sense not allowing the engine to be put under any heavy load or high revs for the first while. I ran our VW Golf in by taking it on holiday to france fully laden without any problems or issues.

Thanks for the info :) I just called the garage to get the new engine number and was told that the engine takes the last 4 (or 6?) digits of the chassis number. So my new engine has taken the identity of the old engine. Apparently there is no need to let the DVLA know that the engine has been changed, but I should contact my insurance company so that they have a note of it. My insurance company was only concerned that the engine had been changed like-for-like, and there was no change to my premium :) The advice from the garage about running in was that there are no general rules other than to let the engine warm up gently before 'flooring it' (their words, lol). I've done about 1000 miles in the new engine, one of the first trips was from Southampton to Canterbury on mostly motorways, so I guess this was quite a good burn in for it :)

I would replace the oil and filter after about 1500 miles. Then just follow the service schedule.

Running in 

I used to manage a transport company near Heathrow,on the fleet were a number of Mercedes Sprinters,each allocated to an individual driver,when new vehicles were delivered one of the drivers insisted in running in the old way ie; 40mph for the first 1000 miles,50 mph for the next , and so on,despite taking a lot of stick from everyone,including me,he stuck to his guns.When his vehicle was at last fulley run in,it used less oil and fuel than any other sprinters on the fleet and was a lot faster.That vehicle outlasted all the others and remained a pleasure to drive untill it left the fleet. I once tried to do it but gave up after a very few miles. Mike

Agreed, but unfortunately I don't have a single receipt or bit of paper to say that the engine was changed! (yet...)