Fuel - Improved Additive
90vw09Subject: Improved fuel additive ZVW 239 003
Model(s): All Gasoline Engine Vehicles
Group: 20
Number: 20-90 T01
Date: May 31, 1990
Research by Volkswagen AG and other manufacturers has shown that the performance of todays gasoline engines is directly influenced by the type and quality of fuel used.
Fuel without the proper additives can cause deposits to collect on fuel injectors, intake ports and valves.
This build-up of deposits can cause the following conditions:
^ unstable idle ^ power loss
^ surging ^ engine run-on
^ misfiring ^ pinging/knocking
Extent of deposit build-up varies depending on type of fuel used, operating condition, etc. Refer to current Technical Information Circulars for description of deposit grading system.
PREVENTION
Prevent deposit build-up through the use of gasolines with injector and intake valve deposit control additives. Consult the suppliers and service stations in your area about fuel grades and additives that prevents or removes these two deposits.
In areas where gasoline containing deposit control additives are unavailable, light deposits can be controlled as follows:
^ add one 6.50z. bottle of Autobahn Gasoline Additive, P/N: ZVW 239 003.
NOTE: Fill fuel tank completely. Do not refill until fuel gauge reads 1/4 tank or less.
REMOVAL
Moderate to heavy deposits can also be removed with Autobahn Gasoline Additive, P/N: ZVW 239 003. When used as follows this additive has shown to be effective.
^ Check fuel injector spray pattern. Purge injection system with G-16 cleaner. Refer to current Technical Information Circulars for injection purge instructions.
^ Check that fuel and ignition systems are within specifications.
^ Add three(3) 6.5oz bottles of Autobahn Gasoline Additive, P/N: ZVW 239 003 for each of three(3) consecutive fill-ups or 1000 miles.
Heavy deposit concentration may require 2 or 3 cycles of the above specified treatment.
NOTE: Fill fuel tank completely. Do not refill until fuel gauge reads 1/4 tank or less.
^ Deposit removal with Autobahn Gasoline Additive, P/N: ZVW 239 003 is more efficient with engine at operating temperature and at moderate speed, short distance driving conditions.
^ Because of possible contamination of the oil, the filter and oil must be changed at the conclusion of each removal cycle.