AKA HITMAN
Member
'07 1500 4 door with the Hemi. Run 87, no problems. Of course, I keep my foot unleaded...
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I've ran 87 in my truck since I bought it not even really thinking about it. It now has about 4000 miles on it and runs great. Is it ok to switch from 87 to 89 and then back? Or is it similar to running synthetic oil and once you run 89 you should stay running 89?
If you use premium it could cause problems done the line as far as build ups and such
As taken from a magazine
High-octane gas isn't necessarily better than regular grade. It isn't somehow more pure and it doesn't go through a superior refining process. It doesn't even keep your engine cleaner, as some people seem to believe. Premium fuel is just gas that contains a mixture of hydrocarbons that are slightly less combustible than those found in lower octane gas. This might seem odd, since cars use internal combustion engines that rely on the combustibility of gasoline to make them go. So, why would you pay extra money for gas that doesn't ignite quite as well as less expensive gas?
Because you don't want it to ignite too early. You don't want it to go bang as soon as it enters a hot cylinder which can happen if the octane is too low. This is called pinging or detonation. You only want it to ignite when the piston has fully compressed the air/fuel mixture and the spark plug fires to set off the reaction.