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My assumption is this is the A/C compressor, First remove the freon for the system, you will need a special tool to disconnect the A/C lines, The parts you will need are new Compressor/w clutch and dryer, freon and refrg oil o-rings for a/c lines new restrictor for high pressure line. remove comp and dryer replace with new and proper amount of oil in compressor, replace high pressure restrictor and o-rings on lines once the system is completely together you will need a A/C vac pump to create a vacuum in the system be for the refrig is added to proper pressure for vehicle Compressor
Why are you running 10 - 40 weight oil. You might want to rethink this. As the miles go up the ware on parts goes up. So I would recommend a 5 - 20 or 5 - 30 high mileage oil. If the oil pump is that new and working properly then this will help with the pressure.
There are several different oils to use. I would run a high mileage oil if possible, the brand really doesn't make a difference, but on the oil fill cap it will recommend the proper weight such as 5-30 or 5-20 or 10-40, etc. Proper weight in a high mileage oil is best. Oil filters are about the same way. FRAM being probably the most popular and widely used.
Factory says 5W-30.
You can do better with Walmart's full synthetic 5W-30 with a filter and oil change every 5 - 6,000 miles.
Just keep an eye on oil level - the V8 version of this vehicle does use oil after about 120,000 miles. The 6 is a bit better until about 150,000 miles.
you will need at least 5 or 6 qts. you can decide on the oil filter and the kind of oil to buy, they have valvoline, pennzoil, exxon, all kinds and the oil filter, they sell purolator, ac, fram,(fram is what i buy). if its got high miles, then use high milage oil.