Thanks Richard, I'm in the fortunate position of having a very low milage engine, it was changed in Norway, acording to the plate 1963. To my knowledge it has run on 20/50 since restoratin. I agree muck is the enemy. Katy the WC54, I'll probably run her on 30 grade, trouble is she has been sitting for nearly two years, I'd welcome to any advice on how to treat her engine. It runs OK, but sitting can't help. I'd like to flush everything through.
Whatever oil it is the engine management system, Brain and right foot. I treat an engine like a horse, always take things nice slow and steady for the first mile, to warm up. And the same for the last mile to cool down!
I ran her from Auchonvilliers one year up to the ferry, 30C + air temprature. Took about three hours. Oil pressure and temp were fine when running but as soon as I reached the port and idlied, down oil- up temprature! I just left her idle for about five minutes till everything read normal before shutting down.