For 2005 Signum A2 Opel recommends to use: and genuine OEM compressor oil with a part number: 90509933. To select the right compressor oil see the table below.
How much compressor oil you need to put into 2005 Signum depends on conditions listed below.
in your garage to make future searches easy.
Condition
Volume
1.9 CDTI with diesel straight-4 1.9 L 118 HP engine (2004.4–)
Please be noted that all capacities listed here are approximate. Check fluid levels when adding or refilling as recommended in your 2005 Opel Signum user's manual. Keep in mind that all information here is provided “as is” without any warranty of any kind.
Before doing any DIY service please check your insurance policy and Opel warranty policy for your region. In some regions DIY service may invalidate your warranty.
DIY car service is not as difficult as it looks like and it might save you thousands of dollars per year. It might be even fun and a good thing to do with your kids on a weekend to teach them how basic machinery works. It's really hard to screw something up and damage your car permanently if you use right tools, follow Opel Signum service manual and use right parts and fluids in prescribed amounts. Even modern cars stuffed with electronics can be serviced in your garage or even in your driveway. Changing engine oil, brake fluid, ATF, replacing brake pads, and etc. It's all may be done by yourself in a mater of a couple of hours.
Doing basic service for your 2005 Opel Signum you're not only saving money, but also also improving your technical skills and learning something new.
2005 Opel Signum generations
In 2005 Opel offered 2 generations of the Signum. Air conditioning compressor oil capacity may vary in different generations. Be sure that you are looking at the rigt modification.