Yung "low oil pressure light" sa dash board suddenly lighted up while i was driving along SLEX yesterday afternoon.
I checked the oil level & it's full to the max. Wala naman change in engine performance. Today, naka ilaw pa rin
yung low oil pressure light & yet oil is still to the max & when i drove the car, pagdating nya ng mga 50kph, may rattling
sound. Pero pag nag rev up ko while naka park, wala naman rattling. Car is RAV4 2001 model

What could be the problem with the low oil pressure light & whether the rattling is related to it ?