I did extensive testing on O-rings during my time with the Team C UK team.
Lots of pros and cons to all the seals - both O-Ring and X-Ring.
Considering the balance point of cost to availability to performance - the RDRP Orings came out on top.
Blue (Flourosilicone) orings don't swell at all as they are a 100% compatible material with Silicone oil, but absolutely no swell leads to catastrophic failures once dirt and astro/carpet fibres get into the seal.
Translucent and white (food grade) orings swell quite slowly, and give a good consistent seal. In relatively clean conditions, these seals can last several months.
Red Silicone (kit) orings swell the most and quite quickly. Maybe only one or two meetings and they need replacing.
AE X-Rings are too small for the standard Team C shock cartridge - you get a leak path around the outside of x-ring. They are usable after they swell up - but no better than the RDRP.
Blue X-rings just leak - not suitable.
Hope this info helps.
William White
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