but make sure u keep the remaining engine oil sealed or not exposed to air...

one thing i feel discomfort about flushing oil is .. after you drain it, there is still little bit balance of it inside the crankcase. as you may know, most flushing oil is kerosene-based. kerosene shears oil faster. the flushed oil looks very dark because you're flushing using the old oil filter. the flush oil mixed with the crap inside oil filter hence giving the "OMG my engine is so dirty and this thing really cleans" impression. flushing using a new oil filter wouldn't look that dark, unless the engine is stuffed with sludge.

agreed with previous poster, flushing oil doesn't clean carbon deposits from combustion by product.

IMHO, as long as you're using top tier@mainstream oil with proper interval, you engine should be free from varnish/oil related residue. no need to spend extra for flushing.

pardon me but why flushing using new filter is it a waste? the purpose of oil filter is to trap dirt.

agree... i bought 2 oil filters, one for flush then replace with another new one for the proper oil.
besides flushing is not on every oils change, so it's negligble.

yes cheeann-san, throw the oil filter away. to put it simple:

* drain old oil
* replace oil filter
* pour in some flush oil
* run your engine accordingly
* drain the flushed oil
* replace oil filter