Cruise Control problems of the 1999 Nissan Maxima

At cold startup, engine oil light usually flashes, and engine makes loud sound like it doesn't have oil pressure. This goes away after a few seconds. Nissan advised to always use Nissan oil filters, which I do, and problem has existed since car was new. When car is fully warm and in drive at a standstill with lights on and a/c off, car idle will drop to about 500 rpm, causing annoying vibration. Dealer says no problems found. Resume on cruise control has failed intermittently about 1 of every 20 times. Resume feature will not work, and you must reset the cruise to the preferred speed. Dealer says no problems found. Door locks/keyless entry have failed several times. Power locks have locked and instantly unlocked when pressing lock button on keyless remote; also, locks have unlocked and then locked when pressing unlock button and had to manually unlock each door. Dealer says no problems found. This is the 8th Nissan vehicle my family has owned and the first I have personally bought new; I do not expect this from a new Nissan car and do not expect the dealer should ignore my complaints.