Engine flushing should be done after 30K kms. You can use STP Engine flush for the same. And no, you should not run for 100-200 kms after putting engine flush liquid. You have to first drive your car so that its normal running temperature is achieved and then drive to the garage and add engine flush to the hot engine. The idle the car for 15-20 mins and then drain the oil.
As abhik said, mixing of oils of different grades is not recommended. But if it has been done, no harm done and you can go in for your regular change interval. And 500 ml is not a big quantity either.
Injectors are to be cleaned at 20K kms. And follow this rule - 'ain't broke, don't fix it'
Last edited by gd1418 : 24th June 2008 at 21:24.
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