Yes, it is fine for all petrol and diesel engines.

Power steering fluids should NOT be mixed together and we always recommend that you use what is recommended in your handbook. Halfords do not sell this fluid at the moment but we can arrange a special order if required of 4 bottles. Please advise.

Power steering fluids should NOT be mixed together and we always recommend that you use what is recommended in your handbook

Yes but this will depend on your car (eg only cars with power steering.)

No in this instance we would not recommend this fluid for your vehicle. Slick 50 Power Steering Fluid is a formulated power steering fluid suitable for service fill. It is not a Dexron II formula, but is compatible with Dexron and Mercon fluids. However you should use Dexron II if possible, but if they cannot find Dexron II ATF, (It may be obsolete) you would be better off using Dexron III, the updated replacement as a service fill fluid.
We do not know the volume required for that vehicle, but many of them hold about one litre when completely emptied.

Slick 50 Power Steering Fluid is a formulated power steering fluid suitable for service fill. It is not a Dexron II formula, but is compatible with Dexron and Mercon fluids.You should use Dexron II if possible, but if you cannot find Dexron II ATF, (It may be obsolete.) your best bet is to use Dexron III, the updated replacement as a service fill fluid. We do not have the volume of the unit, but many of them hold about one litre when completely emptied.So to conclude we recommend you try to find the Dexron products as we cant substantiate Slick 50 in this instance.

Yes Slick 50 Power Steering Fluid 500ml would be suitable for your vehicle.

According to our listings the Iveco Daily 35S13 takes a special fluid for the power steering that we do not carry in our range. We suggest that you contact your local main dealer for the correct product for this application.

Halfords Central Hydraulic Fluid would be the most suitable product from our range for a 2006 Audi RS4.

Unfortunately the Ford Focus Zetec requires a specialist fluid that we do not currently carry in our range. Probably the best place to get the right product in this case would be the main dealer.