Im currently trying to decide weather or not to rebuild the top half of my engine, in order to fix the annoying oil leak on mine*. While the engine runs fine, it is using up 1 liter per tank of fuel. After having a much closer look I think some of it may be from the head gasket and valve stem seals.
I was quoted 5 hours of labour = £500 for mine, probably not including parts. For me to do it, Im estimating if it goes well maybe only 10 hours, but I know it could be a lot more.
The actual parts cost very little:
rocker cover gasket £10
cylinder head gasket £25
cylinder head bolts £30
I forgot to ask how much the exhaust and inlet gaskets cost - which I will need, but shouldnt be more than £10 each...
I will also need to buy a torque wrench, valve spring compressor and a few other bits for £65.
Alternativly I could just leave it, where it will continue to get worse, and I will have to use the much cheaper but wrong type of oil 15/40 mineral, it could eventually die - I wont be able to sell it and will need to save up for another cheap car.
Or I could sell it as is, probably for a similar amount I bought it for last year.
Or I could keep it, and fix it, probably costing ~£150 but it will last several years longer with no other parts need replacing.