It's just oil. Are you driving in extreme conditions? Do you know why people run synthetic?
Buy the oil in whatever weight you need. After that, get a test kit from Blackstone and get your oil tested.
Blackstone Labs
I use LED's and Halogen for different things. I use the LED's because it shows the slightest hologram because I feel halogen won't pick those up as well. I use the halogen to show swirls/scratches.
I will dress them with either CG's Back to Black or 303 Aerospace Protectant.
For tight wheel wells, either get a jack and jack the car up (safety/insurance issue could happen), or maybe locate a slim/thin brush.
Easy. Rub on Rejuvenator. Let it do its job for 18-24hrs or however long you want. Clean with Pristine Clean and a MF towel.
I use garbage/plastic bags because it creates a steam room effect and helps open the pores of the leather. Plus, I like to do the leather in the beginning of a detail so...
Pour some Dawn into a 5 gallon bucket. Put your pads in (make sure they are submerged) and I let mine soak overnight. Next day, I will rinse with warm water under the sink.
Put them on the rotary to spin dry and then lay them in the sun to finishing drying.
I use a little bit of their stuff. I normally will stray away from it because they have 15 different glazes, 40 different APC's. Too much of the same stuff with a different label.
Maybe some MF's, EZ Creme Glaze, and Citrus Wash. That's about it.
I actually have a 5 gallon bucket full of pads now. Warm water + Dawn or Snappy Pad Wash stuff if I have any. Let it sit overnight and then wash them out in the sink.
Hate it.