My family owned this Vauxhall Omega 2.5litre, 4 door saloon for only 4 years and during those 4 years we struggled to keep it.
Petrol was horrendously expensive for doing the school runs every morning and afternoon and had to be filled up at £60-65 a week. For only doing less than 100 miles a week!

Tax for the car is at a higher rate, £215 so quite expensive and insurance is too just for the sheer size of the engine and even for my dad who has driven for 40 years and on Saga Insurance had to pay a premium of £700, mine however being a learner was near the region of £4000, even being female did not make the premium go down.
The battery zeroed out quite a lot and had to be replaced twice during its lifespan with us of just 20 000 miles.
The very small rear window makes it very hard to park as it is a surprisingly long car so a standard space is not to be underestimated, especially if you are just learning to drive and practising on it... eep....
The interior was very comfortable for everyone and the front seats even had "bum warmers" for those cold winter days but the air conditioning however did consume petrol when using it, so it is best to use an eco setting or just open the electric windows. There is even a child lock for the back doors and the back windows also.
Towards the end of the Omega's life, one wet winter destroyed it, on the passenger side it would flood inside the car and make the car mats damp and the smell quite earthy and stale. There was nothing to be done about this aside from an expensive sealant which would have to be investigated from inside the engine bay. During dry days however, the car was dry also thankfully.
The cars engine made a satisfying noise when driving and was like a purr, speeding with it on a motorway felt like flying or cruising. One time my dad did not even look at the dash for a while and saw the needle go through 120mph and it was so easy to do as the ride is smooth. However, this is no compromise for the upkeep of the car itself and all the expensive problems we encountered with it.