Car: 2005 Chrysler 300C
Join Date: Sep 2007
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300C stalling...dealer says use 87 octane
I inherited my '05 300C from my father. The dealership he purchased it from apparently told him to use 87 octane gas which he did for three years. The car was problem-free until I took it over around 40,000 miles and started using the Chrysler recommended 89 octane.
About 10,000 miles after I started using 89 octane gas the car started to randomly stall. The dealer would clean the throttle body and it would be good for another 10,000 miles before it stalled again. I took it in today to a different dealer and their answer to the stalling problem is: switch to 87 octane and use a fuel cleaner every now and then. They said it would not hurt the engine (I took it to Central Chrysler in Norwood, MA).
The techs felt the car was getting a carbon buildup from the 89 octane gas. I now have two dealerships telling me that 87 octane is recommended. What do you think?