I've used this stuff in the GL-4 75W90 variety twice now. This was in two different 020 gearboxes and both of them ended up having a brass shimmer in the oil. Has anybody else noticed this? I put 22K km on the first gearbox's oil before it died from something else. This last gearbox only had 4K km on the oil before I dumped it to inspect the clutch bearing. I've had no luck finding RedLine oil in Sudbury but I've seen a dealer with an Amsoil sticker on his window. I'll have to see what he charges for that.Thanks, Steve