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How to measure the oil requirements for AC compressors in AC systems that are
less that 56oz and more than 56oz. Vehicles like busses and tractors use systems
that can have more than 100oz and heavy duty compressors. The Oil requirements
for systems in busses and large vehicles is much more than the oil in the
average car due to the extremely long hoses. When filling an AC system in a
larger vehicle fill it with the correct amount of oil and then run the system
for 10-15 and then check the pressures since the system may need to be charged
more once the fluid fills any gaps that may have been empty or air that may have
been in the system.
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