Engine oil flush can cause engine damage and isn't recommended. Sludge builds up slowly and if suddenly broken loose by a chemical, the oil pickup screen can become clogged starving the engine for oil pressure.

For the most part, sludge will just sit there in low areas and not cause an issue. If oil galleys are becoming clogged, the only safe method is disassembly and removal by mechanical means.

Our guys solution would be to change the oil now, run the car to hot then park it, remove the oil cap and let moisture escape. Repeat this cycle a few times then change the oil at 2,000 to 3,000 miles. After this is accomplished, revert to oil changes every 4,000.