On #1, replace the headliner and trim panels; pull the dash and clean all vents and ducts; clean the heater core and evaporator. If it's still not smelling right, start replacing plastic parts -- plastic absorbs smells.
#2 -- messed up dash module? Mine had an EML light that stayed on consistently -- key or no key. I ended up pulling the bulb.
#3: get it good and hot. If there's a line at the emissions place, shut the motor off while you wait so that the engine will heat soak and not cool at idle or start up the aux fan.
#4 -- Rob Levinson's Rob Knob (aka RK or RKII) are decent...might be a bit expensive. EDIT: (but it is somewhat gaudy).
a. - Redline MTL/Royal Purple's offering/Amsoil's offering.
#5....oh boy, here we go again. Do a search, matey -- there are tons of posts on the topic. Personally, I like Raybestos QS. Others like the axxis metalmasters/ultimates.
best, whit
Originally Posted by ///Mpressive