The early Panda TA 85hp called for:
Selenia K P.E., SAE 5W-40 ACEA C3, Fiat Classification 9.55535-S2
This was changed for later (current) Panda TA 85hp to:
Selenia Digitek P.E., SAE 0W-30 ACEA C2, FIAT Classification 9.55535-GSI
Owners of older Panda TAs have not been advised that the oil spec has changed, and there seems to be some uncertainty whether the change was because
a) Fiat made a design change which necessitated the change in oil spec, so it doesn't apply to older engines, or
b) Fiat decided that 0W-30 would be a better choice (and reduce warranty issues), so it should apply to older engines.
I tried to clarify this with Fiat Customer Service, and sent them my VIN.
When they called back, the information which came up on their system did not give viscosity ratings, just wordy descriptions. I was off-balance when they called, and thought that nothing had been clarified, but afterwards I realised that they had said 'Digitek' in the description of the oil to suit my engine and this name only seems to apply to the SAE 0W-30.
One school of thought is that you must use what the handbook says, so that Fiat cannot brush aside any problems as being due to using the wrong oil (but when out of warranty, Fiat won't be liable anyway).
The other approach is that Fiat changed the oil to suit the engine, so early TA 85s should also change to the SAE 0W-30 oil.
The original Panda handbook called up the 5W-40 for the 85hp turbo engine and the 0W-30 for the 65hp non-turbo engine. This makes me think that the thicker 5W-40 was to protect the turbo, but that Fiat found that the 0W-30 was better for the TA engine (and turbos cost less than uni-air units).
I have now switched to Selenia Digitek P.E., SAE 0W-30 for my 62-plate TA 85hp.
To summarise the above, both oils have been specified for the TA 85hp, so it is unlikely that your current oil will cause any damage in the short-term, but it may not be the optimum long-term choice.