Ok I just had a question that I can’t seem to find anything about online. I have been getting a rattle at start up on my 08 d22. Been looking through the threads here and the consensus was go with a genuine Nissan oil filter ( I had a ryco on it) to stop the oil flowing out of the filter and back into the sump. Supposedly the Nissan filter has a non return valve to stop this and get rid of the tensioner being dry and causing chain rattle on cold start . Well I put a Nissan filter on it and although it sounds a bit quieter the rattle is still there on start up . How do I know if the filter has a non return valve? If it turns out the filter does have one does that mean the tensioner is on the way out? Appreciate any help