It might just be a slow-ish leak Brian, despite how much fluid it took to top up. There's no real indication of fluid loss until the pump starts complaining, by which time the system is almost empty. The header tank level is misleading too I found. It can look like it has plenty of fluid but if you keep pouring it in (beyond max), while the engine is running, the level drops and it continues to take more, presumably due to the displacement of air in the system. I kept topping mine up for a while until the garage could fit me in. I found it was maybe losing about 100ml per day.
I hope you manage to get it sorted soon without too much expense!
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Mark
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2002 FE S8 Ebony Black Pearl
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Cars Owned:
The Tesla Era: 2020 Model S Performance Ludicrous+ (present)
(Black, with all black premium interior and carbon fibre décor, 21" sonic carbon twin turbine wheels and FSD capability)
The Audi Era: '97 A8 4.2 (Ming Blue) --> '96 A8 4.2 QS (Dark Green) --> '02 FE S8 (present)
The Citroen Era: '84 BX 1.6 RS --> '89 BX 1.9 DTR Turbo --> '94 XM 2.0L Turbo --> '96 XM 2.0L Turbo Exclusive --> '00 Xantia Activa 2.0L Turbo
The Banger Era: '76 1.2L Lada VAZ-2101 (Ruski Fiat 124) --> '80 1.7L Morris Ital HL, finished in Ermine White and Rust
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