If you change oil every 3K then regular oil would do. But if you are lazy like me, then use Mobil 1 and change every 8-10K miles. I've changed my '87 Camry every 3K miles using regular oil and now it has 200K miles without any problem. This engine in very very reliable. I've switched my '96 E320 to Mobil1 3 years ago, no problem.