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My recipe is as follows:
(btw: I use this on my 07 Saab 9-3 Aero 2.0T, so if yours is a petrol itsn't it the same basic engine?)
# add a tub of STP or Wynns engine flush to the oil then go for a drive
# get the engine nice and warm then pull her in the garage. leave it running a few minutes especially if the turbo is glowing.
# lift the front of the car about an extra 3 to 4 inches with a trolley jack (incidentally on my car lifting it this way allows the oil to drain from the rear plug more thoroughly)
# remove the dipstick and oil filler cap
# remove sump plug and allow oil to drain
# remove filter housing and old filter
# place a filter which is only used for flushing into holder
# replace plug and pour half of a 5 litre tub of Comma Flush Out into sump
# drop car back down off jack
# run motor for 20 mins
# have a cuppa and sarny (or perform other service tasks whilst you wait)
# Lift car back up and drain as before
# remove filter housing and filter
# pour 1/4 litre of fresh oil down both the fill cap and filter housing and allow to drain through
# replace filter and sump plug and drop car again
# pour second half of Flush Out into sump
# run for 10 mins plus
# lift and drain as before
# remove filter and discard
# pour 1/4 litre of fresh oil down both the fill cap and filter housing and allow to drain through thoroughly
# wipe out filter bowl if necessary
# fit new filter and fill sump with oil.
# check oil to correct level as usual
I've done this five times now at roughly 4k intervals and the engine is now spotless inside. The first lot of Flush Out is coming out much cleaner than when I first started the regime, so I am reducing the number of flushes to one at each change from next time. BTW I started this regime when I bought the car at 42k and it had only had 3 oil changes at that point. The inside of the engine was quite dirty and oil came out very black for the first couple of changes.
I run on super unleaded exclusively. It runs better and seems to help keep the oil cleaner.
Of course, according to some on here, I'm a dinosaur for not letting my car run to 20k before just draining it quick.But I believe the "proof is in the pudding". My engine is clean inside, it runs virtually silently and is extremely smooth. I also keep the turbo compressor and throttle body clean and it drives brilliantly with neck-snapping responsiveness (it's also got a Maptun tune).
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