I just bought a high-milage 2006 Cayenne S so I put together a nice fluid types/volumes chart similar to what you find in domestic car manuals for older vehicles. My sources for this info are: owners manual, service manual, Porsche minor/major maintenance checklists, pelicanparts.com, and google search. I posted this as a resource that might help others looking for this information. Note there is an option for a limited slip rear differential (mine does not have that option) but if yours does you will need the friction modifier in the gear oil as well this can be added to regular gear oil but many parts stores sell the gear oil with this additive already incorporated. It does not hurt an open differential to use gear oil with a friction modifier, its just a small waste of money for additive that you don't need.
I have a couple questions:
What is the engine oil change interval? the minor maintenance checklist says 40k miles but this seems too long.
What is the power steering fluid change interval? its not listed anywhere.
Also based on your experience with maintaining porsche should any of the change intervals for the below items be shorter/longer?
Anything else a new porsche owner should know about maintenance?
Any good scan tools out there for porsche that don't cost over 1000$?
Part
Interval (miles)
Volume
OEM
Alternative
Cost
Notes
Engine Air Filter
80k or 4 yrs
-
955 110 131 00
Mann C 39 219
16$ ea
quantity of 2 filters are needed for each change
Spark Plug
60k or 4 yrs
-
999 170 218 90
Bosch FGR 6 KQE (identical)
38$ set
1.6mm gap, 19-22 ftlbs, surface discharge type, projected
Engine Oil
40k or 4 yrs
9 qt
Mobil 1, 0w-40
26$ 5,qt
see owners manual for other options
Engine Oil Filter
40k or 4 yrs
-
996 107 225 53
Bosch 72-207WS-INT
15$ ea
https://www.pelicanparts.com/cgi-bin/ksearch/pel_search_2016.cgi?command=DWsearch&make=POR&description=oil+filter
Transmission Oil
160k or 16 yrs
9 qt
000 043 205 28
Aisin 958-300-901-00-M351
9$ qt
https://www.pelicanparts.com/cgi-bin/ksearch/pel_search_2016.cgi?command=DWsearch&make=POR&description=958-300-901-00+
Transmission Oil Filter
160k or 16 yrs
-
955 307 403 01
Bilstein 955-307-403-01-M36
20$ ea
https://www.pelicanparts.com/cgi-bin/ksearch/pel_search_2016.cgi?SUPERCAT_FLAG=Y&command=DWsearch&description=95530740301
Rear Diff Fluid (open)
160k or 16 yrs
1.5 qt
000 043 205 30
75w-90 full syn, gl5, no friction modifier
6$ qt
https://www.walmart.com/ip/Super-Tech-Full-syn-75w90-Gearoil-Qt/309470123
Front Diff Fluid
160k or 16 yrs
1.1 qt
000 043 205 30
75w-90 full syn, gl5, no friction modifier
6$ qt
https://www.walmart.com/ip/Super-Tech-Full-syn-75w90-Gearoil-Qt/309470123
Transfer Case Fluid
160k or 16 yrs
0.9 qt
000 043 305 63
Shell TF-0870
17$ qt
https://www.pelicanparts.com/cgi-bin/ksearch/pel_search_2016.cgi?command=DWsearch&make=POR&LastVisited_input=&description=00004330563
Power Steering Fluid
????
1.6 qt
000 043 305 74
Pentosin CHF 202
14$ qt
CHF 202 supersedes CHF 11S
Brake Fluid
2 yrs
1 qt
DOT 4
Coolant Antifreeze
150k or 5 yrs
4.8 - 5.5 gal
000 043 305 15
Zerex G-40
25$ gal
same price for concentrate or pre-diluted; concentrate may not be available in all areas