I have been working on making my own kit so come December, for my annual maintenance, hopefully i'm good to go.
Oil drain plug - Dorman 090-153.1 (make sure it is the .1) <$2 each at Rockauto or AMZN
Oil Filter - Factory filter from astonstore.co.uk, great prices will be buying 4 or 5 to spread the shipping costs out per unit.
Throttle Body O-Ring - #41UK49 at Grainger pack of 10 for $3.27 - I don't see the sense of only opening up just the right, I do both for inspection and cleanup as needed.
Buying for 4 or 5 years gets me at around $45/kit

 

Great information, thanks!

 

I ordered some of these from Grainger but they are not the right size for your or my DB9.2 which have a larger dia. throttle body than the previous cars. Not sure what the right part number is for our cars.

 

Thanks for the info. When i get to my maintenance i will figure that out and post what i find, unless someone else already knows.
They are cheap enough i don't mind a few hit and misses to get it right, and i have a local Grainger so no shipping costs.

 

For those of you doing DIY oil changes, Walmart has a 12qt box with a spigot for $59 and free shipping.
This is the Mobil 1 FS European Car Formula Full Synthetic Motor Oil 0W-40, 12 Quart

 

Thanks!