Paul, I'm aware of the issue--or, the allegation that there might be an issue--but AFAIK
the only problem is that a "slipperier" synthetic oil may get past aging parts faster than a thicker cheap dino crude. The W-weight shouldn't be much of an issue, as the engine heats up pretty quickly. If the engine is simply not leaking because it is so old and gunked up...Yeah, you've got a point. Then again, an old oilburner that blows smoke can run for a long time burning a quart every two weeks instead of getting a ring and valve job. that still doesn't mean it shouldn't GET one.
Don't slinkies push themselves
down the stairs? (VBG)