Hi can someone tell me what antifreeze I need for my Audi a7 please I know it sounds like a silly question but just had a new heater matrix and header tank but they didn't but enough antifreeze in thanks for any information  dave

Hello Dave,

Thanks for being in touch, and you raise a good question since some types of antifreeze should not be mixed with other types. 

The correct answer to your question lies with the whoever renewed your heater matrix. Obviously, only they know what they used, and I would be driving back to them and asking them to fill your header tank to the correct level. 

If very little needs to be added, you could just use water, but if the level is fairly low then it will need to be topped up with a 50/50 mix of the correct coolant. 

My feeling is it should be red OAT, but as said, we are not sure what they actually used, so a return visit to them would be the best answer. 

Kind regards,

Gareth.