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this is normal for vehicle this age we own a 04 grand marquis and have had three other vehicles with 4.6 engine and all of them do this with mileage and age i would recommend a good brand name oil and oil change every three thousand mi only thing that may help some is an oil additive called moa that is made by bg also run a motorcraft oil filter FL 820s
the system your describing is fine for your vehicle, just remember that the car will turn and drive a little different from the standard weight schedule and factory specs,, however , it will be just like having 2 Big adults in the vehicle all the time, so you should have no worries, the ****** weight your seeming to be worried about is within the limits, here is that described If the ****** of the trailer does not exert enough downward force on the tow vehicle's hitch ball -- meaning that the trailer's ****** weight is too light -- a dangerous condition called trailer sway could result. If the ****** weight is too heavy, the steering of the tow vehicle will be affected.
You should find a fill stem on the black oblong tank or right next to it. This is the low pressure side. You should get a Vacuum pump which can be loaned from Autozone or Oreillys with a refundable deposit. You need to draw out the moisture in the system and create a Vacuum before you refill it.
You should also use an Oil charge for the compressor. There are Freon cans with the oil charge already in them. However, there are different weights of oil used in the compressor. Let the Auto parts people get you the right type for your car. There are different weights, just like engine oil has different weights.
You will need to jump the connector at the low pressure switch to get the system to take freon. Once you have enough to close the low pressure switch you can remove the jumper wire and fill at will.