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The systems that dealers installed back then, if it was a genuine Nissan A/C kit, would be practically identical to the factory system. I doubt that I would be able to tell them apart looking at one, keeping in mind that I worked for Nissan for 16 years and used to install them. Now, that's not to say a dealer couldn't install some aftermarket A/C kit, but, it wouldn't make any sense to do it as they probably could get the Nissan kit at a better cost and it would be covered under the remaining 3-year/36000 mile bumper to bumper warranty.
 

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Unless you are replacing a component, I would leave the oil alone. If you insist on adding oil, I wouldn't add more than an ounce. Too much oil can cause problems. Just used Ester oil, which is a synthetic oil and is compatible with PAG oils.
 

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The high pressure hose attached to the compressor is a pretty common point of failure on these trucks. Look for signs of oil around the crimps if you are slowly losing refrigerant.
 
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