STP Fuel system cleaner once a month
STP Octane boost at every fill up on Shell V-Power 95 or Mobil 98
STP Injector Cleaner once every 2 months
Has actually made a noticeable difference to my tired old L20E...
STP Octane boost at every fill up on Shell V-Power 95 or Mobil 98
STP Injector Cleaner once every 2 months
Has actually made a noticeable difference to my tired old L20E...
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