[Georgeandkira]

There are two camps on engine flushes aka solvents.

One says to avoid 'em. If there's adequate oil being pumped, just use a good synthetic on a slightly accelerated basis. The fear of large chunks of sludge breaking off and clogging oil passages as well as the pick-up screen is huge.

The other says just read the directions and do it.

The '07 non-turbo I bought had 70K on the clock and it all appeared to be local driving. The filler neck grill and cap's underside had chunks of crud.
The service history documented oil changes at an average interval of ~6,300 mi. Doubtless conventional oil was used given the excessive premium charged by dealers.

Because my engine ran so smoothly and start up never produced a single second of clattering, I concluded the lubrication system was delivering oil. Add to that the complete absence of any chunks of any size in the filter.
I decided to eschew any added chemical flushing and let the lauded cleaning power of Mobil1 0W-40 European Formula do its thing.

edit: Where did the red "thumbs down" icon above my post come from?