Suzuki: oil viscosity, oil viscosity, fuel mileage

Question
I recently bought a 1995 Suzuki Esteem. There was no owners manuel with it and I need to do an oil change. What is the recommended oil viscosity?

Answer
Truthfully, I've never as much as ridden in an Esteem, much less worked on one.  I'm a Samurai expert, and make no pretense to knowlege outside that.

However this is easy.

It is supposed to have 5w-30, along with all other light duty stuff like that.

Yes, if you want to use something like Rotella T6 5W-40 synthetic that's fine.

Just don't start using 15W-40.  It won't hurt your engine, but the fuel mileage will drop, and it's almost a dead guarantee it won't start and run when the ambient temp drops below 5 degrees farenheit.