What is everyone using? I have heard a few different answers about this. I have always been using 87, but is 89 recomended? Price dosent matter to me I only fill up once every 4 weeks (Im at school so I dont need to drive a whole lot for now) So will one or the other be better for my truck?
Thanks

 

What does your O/M say? Mine says 91 is preferred, 89 is acceptable. 87 only to get to some 89. 93 is not recommended.

 

Mine says 89 recommended. I used 93 for about a year with my tuner but it was starting to hurt the wallet too much so I dropped my tune down and use 89 now and won't use anything less.

 

I bought my truck with approximately 80k on the clock, previous owner used 87. I read the manual and started using 89.the truck didn't like it. It would sputter and stall after fill ups. Went back to 87 and haven't had a problem since.

 

That's probably due to the computers being used to 87 and retarding the timing to 87. If you seafoam the engine and then use 89 you'll probably be happy

 

with the added fuel cost, what would be the advantages of doing this?

 

I don't usually do this, but there are dozens of threads discussing this same topic, for your convienience, here is one with 92 replies and 18,000 views
https://dodgeforum.com/forum/3rd-gen...i-trouble.html

just search octance in title only and you will get like 100 others.

Generally, most people would agree that you are safer in the long run using 89 octane, the manual says 89 recommended, so you are better off using that. There are several other people on the forum who use 87 and see no reason not to with a properly tuned and maintained truck. Counter to that is if you have major engine trouble down the road because you used 87 instead of 89 you will feel dumb. Or maybe you will never have any problems, who knows. Read some of the threads and decide for yourself.

 

I had an 04. O/M says 89 reccommended. 87 can be used if you need to