Yes that is blue chevron oil up there and yes, I do leave it there all the time. Actually, usually two of them sitting up there but I just used one.
The set up ran me around 450-500 bucks. Price breakdown is this......
120.00 for Dual kit
80.00 for the extra wire kit
105.00 for Optima Red top
145.00 for Optima Yellow Top
Then around 50.00 bucks in extra parts........battery tray, etc.
I could have spent less by using other brands for the battery but, I really wanted the Optimas in there.
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1993 J springs with 1.5inch spacers on top, locked, snorkel, BFG 315's with spacers, Con-Ferr rack with some lights, stripped of the running boards and mudflaps, Slee rear bumper with tire carrier, CB, Hanna Sliders and a tjm bullbar up front with some hella lights. 270k and still going strong