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Hello David, Thanks for being in touch with the forum, and I think you are wise to question this, since it’s not at all uncommon for owners to fit smaller capacity batteries on a so called cost saving principle. Apologies, but I’m not making much of the photo, so perhaps we can get back to first principles:- Have you asked the owner to check under ‘Technical specifications’ ( or whatever the section is called) in the owner’s handbook? This should give you the recommended Ah and CCA rating for the battery - under Petrol engines. It’s not uncommon for battery compartments to accommodate a ‘standard’ size battery, and a longer battery ( higher rated) normally fitted to the diesel variant, and the physically bigger battery can usually be fitted to the petrol engine if desired. Equally important as the battery capacity, is the battery quality, and personally, I only buy Varta/Bosch with a minimum of 4 years warranty - buying on line from specialist suppliers, at best prices. Battery Megastore, and Tayna (there are more) have been used to good effect. Tip:- You should find they sell on EBay with free delivery, but usually charge delivery if ordered direct! Why?? Kind regards, Gareth.

In regard to general non-specific warnings like ESP I take the car to an independent Audi specialist. Its expensive, but cheaper than buying a succession of new parts in the hope that one might resolve the problem. If the warning light is specific (such as "low coolant level") or there are no warning lights at all, I'll first turn to my experience of diagnosing and repairing my own cars for the last 53 years before deciding whether I can carry out the repair myself or take it to aforesaid Audi garage. Working without diagnostic equipment years ago is what I meant by being old school.

Okay thank you will look into hydra products. Not sure what previous owner had in tank but i filled with Vpower from Shell.