I have an 81 240D and like it very much for it takes me anywhere and been driving it everyday and putting about 200 miles/day. I just noticed that its oil pressure is going down to 1.5 on the oil gauge when it stop on a traffic light or when it's idling. This was'nt normal for ever since i had it, it is always pegged to 3. Is this normal?? Or just a sign of normal wear and tear for it is already put 250,000 miles since I have it. I changed the engine oil and oil filter as soon as I noticed the sudden change but the problem still persist. TIA for your advise. Sorry for the long post.