The Marzocchi XCR (1996?) on my daughter's little Kona AA went splat. Before I knew better I ordered the seals, bought a long allen wrench and a pair of snap ring pliars and basically committed to a rebuild. I got the specs for the oil (SAE 20, Marzocchi part #52.51) and this looks like it'll be as hard to source as the seals (ordered from the UK). Can someone suggest an equivalent oil? I did just enough reading on weight/viscosity to make me come here cap in hand.