Did you know that i was with a friend who just returned form HongKong last week and was busy working. And just happens today i was visiting him and ask about his e30 M20B25, upon asking he realise that he did not start the car for 4 weeks, so in went the key and the car started without any drama !!
Guess what ? Original BMW battery from a used e90 car which he bought 1 year ago. WOW !!