This is what I meant. From the right side, rear wheel well. Look under the header, at Cyl 1 position. You will find a plug, or a pet-cock, or something. Undo that something and the block drains. There is probably a gallon of coolant left in there. Image Unavailable, Please Login
Bingo . Holster your weapons guys . Mine was similar, but with a developed pin hole leak . Once replaced with a black anodised alloy tank from Superperformance the coolant maintains its green colour . I gave the rad a serious flush ( along with the gen system ) as a precaution to rid the orange residue which inevitably gets there .
A The more people on this thread say it’s not oil, the closer I get to sleeping in peace tonight. Jokes aside, any specific instructions to flush the rad? I was thinking of flushing the tank but draining from the front pipe as well as from the block as indicated by @yelcab , then filling it with distilled water, drive, drain, drive, drain, until it’s somewhat clear.