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i have a d16z6, and i think it might have to do something with my oil pan leaking oil...but the dipstick says i have a lot of oil in the engine...but i duno?
what you are describing sounds like the bearings. mine does this on occasion and i still spray the hell out of it!
just keep an eye on the oil and keep it changed and you should be fine. now that i think about it, it almost sounds like piston slap when it first starts when its cold