BMW 735-I cylinder-head gasket replacement ,note cleaned up pistons before assembly.

This is doing it the right way,no quick slap it on slap it off,no half job, but just what you paid for, quality workmanship. After quarter million kilometers you should also rebuilt the cylinder head on most cars, why?! Just imagine how many times did the
piston go up and down in that distance and did the valves open and close ,let's try to do the math take average rpm say 3000 rpm that means 3000 revolution per minute at cruising speed of 100 km per hour that's sixty times 3000,in just one hour your piston went up and down in 180000
times now if you want to play with the numbers further in quarter million kilometers
theoretically at highway speed 250000x180000=45 000 000 000 I hope I got it right.
That is for a single cylinder engine if you get a four cylinder it's times four and so on and on it's mind boggling and we expect them to do this without hiccups mmm,any questions?!