My Sherpa manual says every 200 hours or half-yearly. Either way, I bought the machine second-hand. I figure it can't hurt to replace, then guesstimate 200 hours from there.
Thanks for checking the filter type!
Airline powered vacuum extractor... like this?
KATSU Manual Pneumatic Oil Extractor Pump 6.5 L Fluid Evacuator Motor Engine Oil Change Petrol Fuel Transfer Vacuum Suction Pump with 4 Probes for Cars Motorbikes Marine : Amazon.co.uk: Automotive
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KATSU Manual Pneumatic Oil Extractor Pump 6.5 L Fluid Evacuator Motor Engine Oil Change Petrol Fuel Transfer Vacuum Suction Pump with 4 Probes for Cars Motorbikes...
I have an airline, £54 sounds like a bargain compared to tidying up the almighty mess.