Here's the engine detailing article by Jason.
http://autogeekonline.net/blog/
I haven't detailed my engine yet. As far as I've read, it's fine to use DP Ext Cleaner to wipe down since it's still brand new and not dirty.
From reading again, 303 is fine on plastic and rubber. Any rubber protectant will do.
I keep stressing "reading" because I have not
personally done this yet.
You're right though about being
sucked in. 
This detailing stuff is addicting!! I just got in from washing and waxing my wife's car. Since it's brand new, I just washed with DP 4-in-1, waxed with PB Natty's and did the tires with PB BnB. Good stuff. I came in to warm up a little. My hands are kinda numb. It's in the low 50's here and it's windy and overcast. I got some "are you crazy?" looks from some neighbors. LOL.
Then it's outside again to do my Explorer.
__________________
Alban B-)
2008 Ford F250 XLT 6.4L PSD, 4X4, SC, SB, Bedrug bedliner, Torza Trifold Tonneau cover, SS step bars /
Dark Shadow Gray Metallic
2006 Nissan Sentra 1.8S /
Inferno