According to the owners manual, only the following fluid changes are required for a 2009 4.2 NA XF:

Oil changes every 10k miles
Brake fluid flush every 3 years
Coolant flush every 100k miles (or it could be 150k - the actual number escapes me at the moment).

As far as I know, transmission and power steering fluid is supposed to be lifelong and changes aren't required. Also, might sound stupid but Im not sure whether or not there is a requirement to change differential fluid or whether or our XF's even have diff fluid.

Should I be looking into changing transmission, power steering and (if required) differential fluids? I'd rather be safe than sorry with the supposed lifelong fluids.

 

Here you go.

 

thanks.

I'm particularly interested in the fluids that are not specifically mentioned in the passport to service and whether or not its prudent to actually change the supposed life long fluids.

 

The transmission is sealed and has no drain. The only reason it might need a fluid change is if it is used in "severe service" which basically means trailer towing and then at 80,000 mile intervals.

The differential has regular differential oil in it and needs no fluid changes.

The coolant is ten years or 100,000 miles between changes.

The spark plugs are 100,000 miles between changes.

This car requires only engine oil changes and brake fluid flushes.