Last year my parents bought me a 1977 240d with a 300d engine. I love the car because of its old style and drove it for about 4 months before pools of coolant started to appear under my car. I am wanting to fix my car now that my dad recently passed away and i need to know if anyone could help me by finding out what the cause is. I have had people tell me its a freeze plug behind the engine. All can tell is that its leaking between the engine and transmission. if anyone could answer this for me i would appreciate it and i would know that i must purchase a freeze plug.