I know, you're supposed to put 91+ grade gas in Maximas. If you put lower grade gas in it, it might ruin the engine, or whatever, the knock sensor, etc. We're buying a used one (2000) and I don't know if the previous owner used 91 or lower grade. If I start putting t 91 in will the knock sensor adjust back, or putting lower grade permanently does something to the engine?
I'm a newbie, don't flame me.
thanks,
Denis

 

Knock sensors don't adjust back. It's a reactive type sensor.

Just use the recommended fuel grade as stated by your owner's manual and you will be fine.

I would be much more worried by the previous owner's driving habits and maintanence than what grade of gas he was using.

 

Jus ttry to go with the Super or what not in your area to keep up with the 91+ levels. It is worth the extra $1.00 or so you might spend to keep it in good shape.

SuDZ

 

use high grade

 

I have a question about fuel grades. The guy I bought my Max from told me outright he used the 87 Octane (very honest guy). It's been almost a year and I've used 91,92,93 every time but could my computer have retarded the engine and never reset it? Should I disconnect the battery or would it reset itself?

Also, I change elevation of nearly 3000 ft daily. Does it automatically adjust for this? My other (older) car has a hard time with this going into surging fits at idle, unless it's reset fairly often.