You may be familiar with how your car’s air conditioning system operates. It, like your car’s engine, requires a particular amount of oil. You should understand how well your air conditioning system performs if you don’t want to be surprised by a breakdown.
Unless you’re installing a new compressor or there’s a leak in your AC system, you shouldn’t need to add oil to your rear AC compressor once it’s been installed.
If you need to add oil, double-check the operator’s manual or manufacturer’s specifications to see how much you’ll need. Before adding oil or refrigerant, you should usually evacuate the entire system.
If you have a leak in your vehicle’s air conditioning system, first remedy the leak before dealing with the oil needs. In our guide, to help you, you can find more information linked to the total oil capacity and type of oil you’ll need.
By the end, you’ll see how using a vehicle lookup and reference provided on an auto AC compressor oil capacity chart can make life much easier. (Read Briggs And Stratton Oil Capacity)
How Much Oil Do I Put In My AC Compressor?
The air conditioning system, like the engine, requires a precise amount of oil to function correctly. To avoid an unexpected failure, you must have a good awareness of how much PAG oil you need in your AC system.
Unless you have replaced your compressor or there is a leak causing the AC system to spill oil, there is usually no need to add oil to an AC system.
A compressor uses many cylinders to compress refrigerant gases, generating heat and friction.
Oil maintains the temperature in the system and decreases friction by lubricating the moving parts. Using lower viscocity oil causes wear and further problems in the future.
When looking at the original OEM specifications, you’ll notice that different grades of mineral or Pag oil are required you need to replace.
What Is PAG Oil?
PAG oil (Polyalkylene Glycol) is a type of oil designed specifically for vehicle air conditioner compressors.
The totally synthetic hygroscopic oil is a compressor lubricator for AC systems that use R-134a refrigerant. You must know how much PAG oil to add to your AC system and the correct viscosity oil.
PAG150 or PAG VC-46 are the numbers assigned to each type of PAG oil.
This number denotes the viscosity of PAG, similar to how 10W30 denotes the viscosity of ordinary mineral engine oil.
You should consult the owner’s manual to determine the correct PAG oil viscosity for the rear AC compressor.
Before adding oil or refrigerant oil, it’s a good idea to drain the entire system.
Always replace any oil you’ve lost while replacing a component like a compressor or an accumulator. The total amount of oil added will never be greater than the system’s oil capacity, or you’ll end up with too much oil and more problems.
Always remember to keep the total amount of PAG oil added to the rear AC system under 4 ounces or whatever the capacity of your car’s rear AC system has returns designed for how much to add.
How Much Oil Do You Put In A New Compressor?
Seizures and damage result from using the wrong oils, such as universal oils or mineral oil mixes.
This is because universal oils, and mineral oil frequently selected by garages, are PAO-oils or mineral oil with a viscosity different from synthetic PAG-oils.
Mineral oil and PAO-oils react poorly with PAG-oils and the refrigerants R134a and R1234yf, resulting in poor lubrication and increased wear. (Read Troy Bilt Tb200 Oil Type Guide)
Here you can find more options to replace your oil in our AC oil capacity chart. Quantity to be filled isn’t included as the amounts to be replaced for each components, for example, are on the smaller table below.
Compressor Model and Recommended PAG Oil:
|Compressor Model||Recommended PAG Oil|
|Bosch Axial||PAG 100|
|Calsonic CR14||PAG 46|
|Calsonic CWV6||PAG 46|
|Calsonic DKV||PAG 100|
|Calsonic V5||PAG 150|
|Calsonic V6||PAG 46|
|Chrysler A590||PAG 46|
|Chrysler C171||PAG 46|
|Chrysler RV2||PAG 100|
|Denso 10P||PAG 46|
|Denso 10S||PAG 46|
|Denso 10SRE18||PAG ND-8|
|Denso 2C||PAG 100|
|Denso 6C||PAG 46|
|Denso 6CA||PAG 46|
|Denso 6E||PAG 46|
|Denso 6P||PAG 46|
|Denso 6SB||PAG 46|
|Denso 7SB||PAG 46|
|Denso SC08||PAG 46|
|Denso TV||PAG 100|
|Ford FS10||PAG 46|
|Ford FS6||PAG 46|
|Ford VF2||PAG 46|
|GM A6||PAG 150|
|GM HR/HT||PAG 150|
|GM R4||PAG 150|
|GM V5||PAG 150|
|GM V7||PAG 150|
|Hadsys HS-090L||PAG 46|
|Hadsys RC17||PAG 46|
|Hitachi (all models)||PAG 46|
|Keihin (all models)||PAG 100|
|Matsushita (all models)||PAG 46|
|Mitsubishi (all models)||PAG 46|
|Nihon DKV||PAG 100|
|Nihon NVR||PAG 100|
|Panasonic (all models)||PAG 46|
|Sanden SD5||PAG 100|
|Sanden SD7 (key shaft)||PAG 100|
|Sanden SD7 (splined shaft)||PAG 46|
|Sanden SD7V||PAG 46|
|Sanden TR||PAG 46|
|Sanden TRF||PAG 46|
|Sanden TRS||PAG 46|
|Seiko-Seiki (all models)||PAG 100|
|Tecumseh (all models)||PAG 100|
|Visteon RS-18||PAG VC-46|
|York (all models)||PAG 100|
|Zexel DCV||PAG 100|
|Zexel DCW||PAG 46|
|Zexel DKP||PAG 100|
|Zexel DKS||PAG 46|
|Zexel DKV||PAG 100|
|Zexel TM||PAG 46|
Here are the amounts of PAG oil required for smooth operation by AC components:
Compressor = 1.4 ounces
Evaporator = 1.5 ounces
Condenser = 1 ounces
Accumulator = 1 ounces
Hoses = 1 ounces
How Much Oil Does a 134a Need?
Regularly service your vehicle’s A/C compressor by inspecting it yourself or taking it to a professional. Your air conditioner has an engine-like compressor that requires oil to run. The compressor compresses the AC gases, which then expand and cool.
Gases become heated when compressed. Air is blown over the cold gases in the evaporator to keep you cool in your car.
The AC compressor, unlike a car engine, includes cylinders that assist compress gases. Heat control and maintenance are required as it works hard to compress the refrigerant.
If not correctly maintained, the constant compression, expansion, and circulation of the refrigerant can cause system stress.
If your AC isn’t as frigid as it used to be, you may have a leak. A system leak could prevent your AC from being cool. If you opt to fix the leak yourself, be very careful because the amount of refrigerant lost is unknown.
If you fix the leak and add AC refrigerant, be aware of the hazards.
- Too much oil in the AC refrigerant might cause poor compressor operation or lead to leaks.
- If you don’t add enough, the AC compressor may overheat or break down.
How Your AC System Works
First, your AC compressor compresses the refrigerant, raising the temperature. Then the condenser cools it. It collects in the receiver and becomes liquid. It then expands and cools as it flows through the evaporator. The gas is then compressed. The low-pressure refrigerant returns to the compressor are compressed and leave as a high-pressure gas.
Types of Refrigerant
The car sector has used R134a refrigerant for almost two decades. After 2015, a new eco-friendly refrigerant, R-1234yf, was adopted.
With these different categories, refrigerants also affected compressor lubrication. PAG oils (polyethylene glycol) are the most satisfactory replacements.
R-1234yf needs PAG-oils which range in viscosity from 100 to 150. If your A/C system doesn’t have OE standards or what was originally charged in the information provided, use PAG 100 for
R-134a in most cases because of its universal viscosity.
Excess lubricants reduce cooling capability. It also unnecessarily coats your compressor, reducing heat transfer between the atmosphere and your system.
Can I Use PAG 46 Instead of Pag100?
Guides for refrigerant and oil capacity are based on data from sources like ALLDATA and Mitchell. Always double-check the information provided with your vehicle manual or the information on the underhood stick, which is sometimes placed on the top of the accumulator component.
The appropriate amount and type of oil are essential in the air-conditioning system, whether used to repair compressors or refill the system during service. Mineral Oil performs critical functions in the air-conditioning system to prevent wear and increase efficiency.
Using high-grade compressor oil is consequently essential for the system’s reliable and continuous operation.
Using low-quality or simply incorrect oil causes increased wear, premature compressor failure, and loss of warranty/guarantee, just as it does with the engine.
Using the wrong oil can cause damage. You must observe vehicle and data provided on manufacturer-specific oil capacity guides accordingly.
PAG oils are highly miscible with R134a (PAG oils 46 YF and 100 YF are also miscible with R1234yf) and may be used to lubricate the air compressors and condenser systems in most passenger and commercial vehicles.
Choosing the correct viscosity is crucial when using PAG oils (PAG 46, PAG 100, PAG 150). The cars manufacturer specifications and approved products should be observed when reading a Pag Oil Chart for lubrication reference.
PAG oils, for example, have the problem of being hygroscopic, which means they absorb and bind moisture from the air. (Find the Best Truck Tire Air Compressor)
As a result, unsealed oil containers must be resealed right once, and leftover oil has a short shelf life. This is critical for the air conditioning servicing unit’s fresh oil containers.
Mineral oil, for example, will not apply to automobiles that were originally charged with R12 refrigerant.