Hi,
I have a 4.6 HSE
Beautiful to drive fast and quiet.
It took me a long time to find the one I wanted, after listening to many contributors on these pages and viewing many, many cars I found the one for me.
Full service history, body and interior immaculate, low mileage, everything appears to work.
My tips would be
1; Look at the exterior and interior _ it should look cared for.
2, Service history is a great help to know if it has been serviced regularly and what has been replaced. When it was last serviced?
Most stop being serviced after a time and are only patched up, I would avoid one that has not been serviced regularly, as oil changes on the v8 are very important to the longevity of this engine.
3, Look under bonnet and see if the engine has signs of poor service, or trouble. Check oil, is it reasonably clean and topped up properly, belts, oil leaks, water leaks, remove oil filler cap and look for mayo, ask yourself why it has got it, expansion tank for crap and correct colour --- not cloudy.
4; Start her up and listed carefully to the engine, should sound sweet without knocking after a second or two. Check dash for any faults being reported and try all controls for correct operation. Lights on EAS should have settled within a minute or so and now be constant at 1 level, if flashing for longer than a couple of minutes without settling you may have an EAS fault.
Don't put your foot on brake pedal or open any door while you do this or you will stop the EAS from altering position.
Check the HeVac for approximate outside air temp, if this incorrect it may be expensive to repair.
5, Check underneath the car for air suspension bag condition, Cracks appear in suspension and the car may not sit level or not rise correctly.
Do these checks with the car raised to wade height and drop the rear tailgate. This will stop the care settling down on you while you look.
6; Take it for a long test drive and re-check everything again.
Good luck and I hope you find the one for you
Post again with your progress.