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I use a syringe and a hard plastic but flexible tube end that I can push through the fill opening and ones it's inside the 90 degree angle flexes back inside in order to get suction from the lowest point in side the unit.
Ones I get air I can pull it out and the syringe shows me the amount of oil to replace.
I do stuff the cavity below the fill plug with paper towels in case the plug drops of the allen head tools used to get the plug out.
The 100ML syringe is available from ebay search > 100ml Large Plastic-Steel Syringe Pump With 150cm/59inch Oil Liquid Injection100ml Large Plastic-Steel Syringe Pump With 150cm/59inch Oil Liquid Injection.
The hard but flexible 90 degrees section black tubing you see in the picture is from a left over MB vario roof hydraulic line and the small (yellow) clip (flow shut off) came from a medical IV bag tube.
I believe the total was less than $25.00 and it will make the ideal tool to change the SC oil as you'll cut and accurate measurement for the amount that comes out versus what you'll need to put back in.
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.
