Compression Ignition Addict
Join Date: Sep 2012
Location: The place where the 2nd amendment is considered illegal.
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You already answered your own questions (You're correct and the boy isn't)
6.4L capacity 15 quarts (including oil filter)
6.4L tends to make oil (again you're right)
NEVER overfill the engine (Could lead the disastrous results), stay between the marks and you will be fine.
My personal opinion ****NEVER let someone do the oil change for you, do it yourself (whenever possible) ****
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