1936 Dodge oil change

I am planning to do my first oil change on my 36 D2 this weekend . I have been told by a Chevy owner that I should use SAE 30 for winter .I am not sure what previous owner used .Our winters rarely fall below freezing .Can the same oil be used in summer (British) .Also anyone know size of washer for sump nut /bolt I as want to get new one before I start . Any usefull tips welcome :confused:

I'm in Wisconsin and have been running 5W30 but am going to switch to 10W30 now that all the engines are spick and span inside.......

Maybe this will help.

http://www.widman.biz/Corvair/English/Links/Oil.html

I believe that your Dodge would be the same as a Plymouth with respect to the oil pan drain plug and washer. Perhaps this could help: http://www.ply33.com/Parts/group10#105456

Or, on the same web page: http://www.ply33.com/Parts/group10#10-24-37

I personally use 20w-50 year round in my rarely freezing environment, but the early and mid '33 engines have a little different oiling system which results in a bit lower idle oil pressure than the late '33 and newer engines. And in summer I often tour inland a bit where the ambient temperatures can easily be above 38°C. With the later oil pressure relief setup and in a climate with cooler temperatures, I'd probably use a 10w-30 or 10w-40.

Thanks guys for your advice and the link to vendors from PLY 33 - A really useful list for new comers like myself !