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#2463332 - 02/20/12 10:09 AM Which Pag oil to use ?
gky Offline
Member

Registered: 08/27/05
Posts: 274
I recently replaced some a/c parts on my 92 crown vic and I was looking to add a little Pag oil but when I went to the store they did not have the oil charge I used many years ago
The guy behind the counter gave me three different choices but I was not sure which one should I use
I converted my existing R12 system to R134 about 10 years ago maybe Back then there was only one type of oil charge so I didn't have to decide which one to get

Does it matter which oil I use ? Pag 46 100 or 150
Is it just a viscosity difference or is there something else also ?

Why are there so many different types now when it made no difference in the past ?
Can I mix the different viscosity types ?

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#2463392 - 02/20/12 11:28 AM Re: Which Pag oil to use ? [Re: gky]
stalag Offline
Over the Hill

Registered: 03/29/09
Posts: 2797
Loc: Columbus, OH
PAG-46 The difference is in viscosity. It is recommended if you do need to add oil you change your dryer/reciever as well. All of these oils will mix with each other but Ford recommends PAG-46. If you have older oil in the system this oil may not be compatable with any PAG formulation.
_________________________
Stalag;___________Just for Rizzo I am posting this in my sig. Coolants
2001 Lincoln Town Car Cartier L, 1997 Mercury Grand Marquis (extinct)
On my LTC the following mods/upgrades were added. Heinous motorsport control arms, Command Automotive SD-1 rotors, Calipers by Goldlinebrakes.com in silver with Hawk HPS pads, MSD COP's. MZT is also applied with programming from BOC. j-mod is now done. Final rebuild of transmission done by Gearstar.

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#2463478 - 02/20/12 01:32 PM Re: Which Pag oil to use ? [Re: gky]
gky Offline
Member

Registered: 08/27/05
Posts: 274
Thanks for the information
Well I already have Pag oil in there it's just that a long time ago they did not have a viscosity reference

I was just wondering would there be any advantage to using a higher viscosity oil like the 100 or 150 or is that going to cause more harm than good ?

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#2463485 - 02/20/12 01:46 PM Re: Which Pag oil to use ? [Re: gky]
P71Ham Offline
Climber

Registered: 11/18/08
Posts: 650
Loc: Parkersburg, WV
The system was designed for PAG 46. No advantage to using higher viscosity. I'd just stick to what it calls for. Itd be like putting 15W40 in a motor that calls for 5W20
_________________________
'01 Crown Vic. P73. 145k. Ex college president's car.
Mods so far:Bumper tuck, Sony Xplod head unit, sidemarker blink mod, New OEM headlight housings from ADTR, BH1976 Headlight Relay Harness, $40 junkyard 70mm TB (More to come as $$$ permits)

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#2463553 - 02/20/12 03:38 PM Re: Which Pag oil to use ? [Re: gky]
gky Offline
Member

Registered: 08/27/05
Posts: 274
Uuuups
I have to correct myself
Upon further digging in my garage I found the old can I used many years ago
It says on the back it adds 4 1/2 oz of Polyol ester lubricant
That's what I was looking for but I can't find anything but pag although after I looked online I found a few places that sell Ester oil I guess I will buy it online then
I also read that the Ester oil does not have a viscosity so that all makes sense now

As far as the motor oil I like to use thicker oil in the summertime like straight 30 or 40 I even used 50 weight Valvoline racing oil one time which is good for my high mileage car as far as compression but it's getting too expensive to use it all the time

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