I have a 1995 Nissan Almera N15. Its got a GA14DE and its done 96,000 miles. I just had a new sump fitted (due to an overtightened sump nut by previous owner) plus oil changed and a new filter. When I start up, my engine is noisy/rattling and the oil pressure light is on. However, when I give the engine some gentle revving, the noise stops and the oil pressure light goes out. The car then drives fine and the light doesn't come back on until I next start the car from cold. Could this be a bad oil filter restricting flow? Or maybe they didn't put something back properly when fitting the new sump? Any ideas would be appreciated, thanks!