Compression Ignition Addict
Join Date: Sep 2012
Location: The place where the 2nd amendment is considered illegal.
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I can't answer your question #2 but the OEM radiator is quite reliable (some bad apples here and there) As you may know some 2008 models had a recall for bad radiators. My radiator (OEM) is holding well.
2005 Pontiac GTO (1 of 645) (LS2 6.0L, 6 speed manual / 3.46 gear) 39k miles
2007 F-250 XLT (6.0L, 2wd, 6 speed manual / 3.73 gear) 42k miles
2008 F-450 LARIAT (6.4L, 4x4, 6 speed manual / 4.88 gear) 38k miles