Switching from long life to annual service, good idea?

[Stevemr]

I have a 3.0 TDI A4 cab 2007 with 40000 miles on the clock. I have had it for 5 years and its used for holidays and days out. I do about 6-7000 miles a year.
Its a car I intend to keep for ever.

At the moment its on long life service oil so it gets serviced on time after 2 years and about 12000 miles.

I am going to chip it with a superchips bluefin.

I am thinking I might be better off going to normal oil and getting it serviced every year.

Would welcome opinions from those in the know?

[Stevemr]

OK so annual service, but is the long life oil that much better its worth using annually?

Also as its now 8 years old do I need to think about changing the oil in the manual gearbox or the diffs?

[Stevemr]

Yes it has DPF unfortunately!

[Stevemr]

OK going to do as recommended and use long life oil and change annually.

Its on Mobile 1 5/30 full synthetic longlife oil at the moment. Have ordered some quantum long life 111 5/30 oil as apparently thats what Audi recommend, I should not have any issues changing to that should I.

I have also ordered
Oil filter
pollen filter
air filter
fuel filter
sump plug
All genuine audi parts.

Is there anything at all I have forgotten?
Looking at the service book, there does not appear to be any recommendation to change the gearbox or diff oils, so at 40000 miles I will leave them for the time being.

Is it worth using injection cleaner at all? Fuel is shell optimax whenever I can get that.