[elhigh]

If your compression comes up low, a cylinder hone and new rings are your best option. Any pour-in "fix" won't really fix it and won't last long in any case, though I see Engine Restore product gets some kudos on BITOG. And as Ecky pointed out, it could do more harm than good in those finicky little oil passages.

You pays your money, you takes your chances. There are known solutions that are known to work, and there are other solutions whose results are largely anecdotal. With enough anecdotes it can start to feel like hard data...but it still isn't.