Actually I did not. The system was repaired about two, maybe three years ago - relacing the original spheres. At that time I will ASSUME they (my very reputable indy shop) replaced the filter when refilling system with oil. What is the replacement interval for the filter? All I needed was to level off the reservoir. My concern is to understand - where did this lost oil go?

Incidentally, I've noticed the distance between the tire and top of both rear wheel wells has increased by an 1-1/2" - 2". It's obvious I was not paying attention to this - kinda had the attitude that the system was fixed and so no worries! Wrong.

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Dale