From reading some of the posts here, the radiator blocking one in particular, some are implying that cold weather invites sludge buildup. What exactly are you talking about? I was under the assumption that overheating the oil caused that. I'm concerned because I'm moving from Florida to Idaho in about 45 days. It's a higher elevation and waaaay north. Gets down below 0 deg F easy. You guys got me paranoid cause I just spent a boatload on full synths and ARX and bypass filter etc. I'm hoping this all hasn't been in vain! I think I'm gonna go put a blanket on her to keep her warm!