OK, I guess its a good time to dredge up the topic of oil additives. I agree that some are nonsense snake oil, but a few others out there seem to have theoretical merit. I just dumped in a bottle of Rislone Compression additive into my 259 V8. It "claims" to improve compression resulting in smoother idle and improved performance (horsepower) along with reduced oil burn due to ring wear and / or valve stem seal wear.
My engine has only 59,000 miles on it (never rebuilt). I dumped in a half quart of this stuff and within 20 miles I actually DO notice a marginal improvement, mainly in smoother idle. Since replacing the split rubber hose from the engine head to the line running to the oil gauge, oil consumption has been marginal to nil. I'm hoping that this small consumption will be further reduced.
What is everyone's thoughts on these additives? Yes, some are crappy nothing, but I[m suspecting a few of them may have some merit???????????????