Please bide for help.Do I have warranty after 6 months at car dealers?

Hello, I ask for your help 6 months ago bought an old car. 12 years old. paid 3500 euros at a car dealer. (BMW 316) who also sold me a guarantee. 150 euros for a year. now the car is kaput. so that the factory town opposite its dealers wanted to invite me the reparien. after which only the Hudrostössel was kaput he has now said that the tooth-brittle has to be awakened and also the camshaft. so that a bill of 1200 euros has set. the Garatie I have taken over 550 euros of it. do I have a CHANCE to get the remaining amount of 650 euros from my dealer? where I bought the car he had 135,000 km and now 142000 km. so I drove in 6 months 7000 km. and this error was already in the beginning. of course did not slip into contract but now after 6 months the engine has given extremely laiute smell and the performance was also gone. so have let this change. but as I said I thought it’s just the hydro plug and that wouldn’t have been so expensive. but now… what’s a guarantee. would that be in there? if so what can I do now? please help me because I’m totally desperate. am a poor azubine and I have to save for a long time for the car. better said since my birth (weinhachtsgeld birthday) etc. LG jiji