Wierd and annoying rattling noise

[Ivan141]

Sounds like the pistons are okay, valve seals are probably also reasonable if there isnt a lot of blow-by gasses. Oil pressure should always be between the 2 lines on the scale though. About 3/4 of full scale in practice. My current engine only drops pressure under the first line at low idle speeds, I dont like it when it does that. If it runs at middle of the pressure gauge while driving I would seriously start saving up for a new oil pump. Also oil pressure usually starts dropping a little bit on high speed runs (continuous high revs) but that's somewhat normal.

Before going worrying to much though, make sure oil level is in order and check the connector on the oil pressure gauge since they come a bit loose sometimes causing weird pressure readings.