I have a 1981 240D Manual transmission with 207,000 miles on it. The car is great, San Diego Rust Free car, everything works, including complet vacuum system. I read the threads on here about blowby, and checked my car out. I did a blowby check when the engine was cold and hot, and both times I had a good amount of blowby. I loosened the oil cap, and it would sit there and shake. The strange thing is, my car runs excellent. I have owned a couple of 240D's and its power is better than the others. Its 0-60 time is right there with the factory specs. So my question is, how important is this blowby issue. Is it a warning sig of things to come in the furure. Should I just leave well enough alone. Thanks