For my maxima (93 SE with 95,000 Miles) I used regular Mobil Oil (5W-30) with Nissan Filter. But right now the regular ones are all gone from the stores.. I see synthetic, Clean 7500, Clean 5000 only... Is clean 5000 same as regular Mobil..?

 

I'd use 10w-30 for spring/summer. The engine will be getting hotter then in the winter, and the oil will get thinner. So its better to use 10w30. As for the milage ratings, I donno.

~Alex

 

As per your owners manual, find an appropriate weight designated "energy conserving" and you should be ok. Even if it's not your brand of choice, it won't hurt for one OCI