I've gotten a few old stinky cars through Aircare with the following cheat:
- Buy a small bottle of methyl hydrate. Typically sold as a one tank shot in 125 ml doses as fuel line antifreeze.
- wait until your tank is nearly empty. Add the stuff, put in 5 l of chevron or Mohawk 94 octane.
- give the car an Italian tune-up to get it nice and hot.
- go through aircare. Pass. Quickly fill up the tank. Methyl hydrate can be rough on the internals in high concentrations, so dilute it with a full tank asap.
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