why dont people change engine oil

[semtexsteve]

i have just removed the cvh out of my donor after hearing it run and test driving it and it sounding and running sweet only to remove the rocker cover to find everthing in side coverd in 1 - 2 mm of what can only be likend to thick tar so i am looking at a very big cleaning job oh the joys of car building oh well wors things happen at see look at titanic . anyone ever had the samething and have they got any words of wisdom and help ???????