The
maintenance is exactly as LS describe. I know it's a fiddle. IMHO, if you want to make your system absolutely superb, fit a reservoir to the filler-cap: a windscreen washer-bottle's ideal. Fit it above the
pump, and connect it to the filler-cap. When you refill the system while bleeding it, it'll allow you to keep the level of
oil above the minimum level. When you bleed, don't be tempted to mess with the pipe-fittings, BTW- use the nipples that look like grease-points, and make sure the
oil you use is ISO22 viscosity.