MGB & GT Forum

You know something Scott, there used to be oil everybody used that would cling to unused engine parts for so much longer that what is now. It called something like "single weight oil" of the sort oil that comes out of the ground, then processed, but not "sunthetic" oil. On technical consulting years back In Swedish Navy when odd things begin to happen with military Piston engine aircraft, I among small group of people with engineering knowledge and also physics to get call to fix. Not much to figure out though, as of 4 men team, two of us also Pilots and with private aircraft, also. It found out already, or should say it theoried that reason was new "multi weight" oil had additive or some thing added which made oil fall off of bearings and such not immersed in oil. We both had read all about this cling problem in aircraft magazines, no internet back then. As problem for us to figure on was rapid wear on bearing surface, starting engine after long wait worst thing about it, this theory seemed like it was it, and sure enough that is what we found out and fixed. Surely if you google something like "aircraft engine wear multi weight oil" you find old stuff on this.

My guess is your new oil find is simply lacks that additive, or is single weight, or has some other additive to overcome first additive so to make stick on there longer. But you right, buzz word "cling" sound like some rotten smelly fish, I think, too.