I'm surprised none of the backroom experts have given the correct answer!
The OP drained all the oil and fitted a new filter. Chances are the oil galleries drained down if he did it for long enough and did he pre-fill the filter with oil?? (not always possible dependent on filter type and mounting position).
Therefore on start up, it would take a few seconds for the engine lubrication system and filter to fill up before oil pressure built up significantly - during this time the hydraulic chain tensioner (I'm guessing its hydraulic) is slack / hydraulic tappets empty etc and hence horrible rattling for a few seconds until the oil pressure light goes out. Quite normal on some engines.
I'm now guessing this frightened the OP who now thinks he can hear a faint rattle - which probably was there all along, or was masked by the sludge around the chain cover.
I'd suggest that he (and everyone) steer clear of aftermarket filters, most motor factors will sell the cheapest junk they can source. Buy an OE filter - in this case either genuine Nissan or OE quality ones like Mann-Hummel. And buy the correct spec oil for the car - have a look in the car manual.
If the oil hasnt been changed for a long time (and its sounds probable) an engine flush might whats needed to unblock/remove the gunge still in the engine (and chain tensioner/tappets etc)
|