Gonna be going this soon and have a couple questions. If replacing the plastic elbows with aluminum ones would using RTV so assure no o-ring leaks in the future be a bad idea? I don't see having to replace the aluminum ones ever so I wouldn't have to worry about scraping off old RTV. My other question is I will refill for Dexcool for the time being but in the summer will do a whole coolant system flush. There's no reason I should do the flush now right?