Going to get the 150 on the road this week. Normally put in 87(v8) but was wondering if 89 would be alright? Or use it say, every 3rd fill up. Some people say it helps run smoother or burns off crap. I just want to be sure I use the right or optimum fuel. Its funny, normally I am the one on the car forums saying just use what it says to use but the truck has nothing saying octane rating but I remember seeing 87.

 

waste of money to fill up with anything other than 87. Higher grade fuels just help to prevent pinging

 

yea, thats my thoughts. I know sometimes my parents f250 5.4 does better when towing on 89 then 87 but other then that 87 is what we use.

 

I put some 91 in my 5.8 today. I usually run 87 with some lucas fuel oil. Seems to run smoother, quieter. I wanted to try the 91 for a tank full.

 

Higher grade fuel burns more slowly. In a high compression motor or extreme timing advance that helps eliminate detonation. Our trucks are low compression designed to run on 87 octane such burns quickly. The slow burn doesn't have time to burn completely in these engines and can coat the inside of the combustion chamber with unburned fuel which eventually becomes carbon deposits. The deposits build up and can cause the valves to stick or reduce the chamber size increasing compression and causing pinging. Also the carbon can retain heat and cause detonation. This is why trucks run on high octane all the time don't run well when switched to low octane. A good fuel system cleaner like Lucas or Seafoam used regularly is a much better idea.

 

Yea thanks, I am going to run the lucas stuff when I get gas as I just got the truck on the road today(plate).