@Binoy: See following website, for example:
http://www.customercare.tatamotors.com/service/decarbon.asp
Quote:
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Why Engine flush is Required High engine temperatures caused by heavy stop and go driving conditions lead to thermal breakdown of engine oil. Not all of the oil is removed during a drain and fill oil change. Deposits are left behind and form sludge and varnish in the engine resulting in smoke from the exhaust and increased oil usage.
Solution:
Engine Flush treatment helps in
- Safely and effectively cleaning and removing oxidised particles and fluid contamination left behind from previous oil changes
- Preventing further deposits
- Freeing sticky lifters and rings
- Chemically “tuning” the engine during driving
- Restoring pep and power
- Removing sludge from valve train
- Promoting fuel economy and improving overall engine operation
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If engine "pep and power" is improved, you will need do less downshifting and as a result mileage should improve. This holds when the engine performance is badly affected by carbon deposits. Of course a lot depends on driving style. However, I should add that engine flush is also known to create problems when done on very old vehicles which have very heavy carbon deposits (apparently the oil lines get choked as a result of the freeing of deposits and cause engine seizure). So this should only be done when recommended by authorized outlets.
Edit: I also recommend that the car's mileage be checked when driven with the AC off. If there is a substantial improvement in mileage (say, more than about 1 km/lit) then the AC should also be checked/serviced.
[ http://in.youtube.com/profile_videos?user=sradhakr1&p=r ] & [ http://arxiv.org/abs/quant-ph/0504115 ] & [ http://www.worldscinet.com/ijqi/08/0803/S021974991000640X.html ]
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