Your opinion on engine oil flushes?

[Franco Cozzo]

Hey guys, I'm just curious what everyones experiences are with these "engine oil flush" additives you can get from auto retailers? I used a Wynns engine oil flush when I serviced Dad's car about 10,000km ago, what I did was drained out the old oil, removed the old oil filter, put a new one on, filled it up with some new cheap 20W-50, added the oil flush into it, then let it idle for an hour, then drained it, but the oil didn't really come out that discoloured, it was still that gold colour but slightly darker.

I'm giving it a go this service except with a different brand, though it seems Americans have some obsession with this stuff called "Seafoam" or something from Subaru in a spraycan.

Here is an advertising thing for Seafoam, it makes one hell of a smokeshow:

http://video.google.com/videoplay?do...0865726229173#

Dad's car has 265,000km on the clock.

Also what about using diesel oil? I assume it has a stronger detergent package than normal petrol oil right? Is i safe to use in petrol engines?