[Greekstang]

is regular 87 ocatane good for my 3.9 2004, im using 93 super right now but im not sure if i need to be?

 

[Greekstang]

Thank you for clearing that up for me,
I have this old school mechanic and he said the higher the octain the better it is for the injectors. But in fact I starded to run with the 87 and the car does feel to respond much better, maybe its in my head but it does seem to be better.

 

[Greekstang]

i started running with the 87 octane and it was fine, but today i filled up and i started to hear the pinging, only at the lower speed 5 - 10ml
is this something to worry about? i must tell you ive been using 93 octane for about a year, did i condition the car or something?

 

[Greekstang]

Thanks for the info guys,

I'm in NY city, out side boro, my area is filled with Sunocco gas stations, i think theres one mobil and shell station.

you think maybe i should try another brand gas or fill up with 91 octane?