hi am looking for help I've got a Audi a4tdi 20l with 78,000 and over the pass couple of days,on start up I've got a noise it sounds like the engine is dry and it sounds like a tank but after a couple of miles it's goes but it still there a little.ive just done a 500 mile round trip and the next day when I went to start my car this started,I've checked my oil and it's all good,if anyone could help and leave feed bk would be greatfull thanks Graham's
