What is the best gas to use in 1999 Cadillac STS?
The best and only gas to use to keep your caddy emmission clean is 93' octane. preferably from a Shell's gas station.
I think the best answer is, YOU DONT. My warning message has come on at least 10 times since I bought the car a 2001 Cadillac Seville STS. It just shuts off and doesnt come back for months. Could be electrical problem, as my gas guage is never accurate and goes up and down on its own, had all instruments not work sometimes and then just start working after disconnecting the battery and reconnecting.
Cadillac sts has air shocks wich are controlled only by a air pump, or a hidden air valve, which u can then pump air into it like you are pumping up a tire at a gas station. For each air shock it is around $140- and up. If you are thinking about replacing them due to not leveling out your suspension at all, check to make sure the air pump is on/working if not that…