Old-school so 502 for that VR but 504s are backwards compatible so have it with either. I have the same engine in my Atlas - got my 36mm socket from www.shopdap.com but you may be able to find it on Amazon etc. You can get oil change kits from FCP Euro delivered (Liquimoly) for about $60 or just hit Wallyworld for the typical Euro flavors they sell for less.