As others have indicated in their replies, Amsoil is formulated for extended use, and by high end formulation choice it will run cleaner than other oils. Highly skeptical of people blaming Amsoil without full context, oil formulation is a balance. How do we know the maintenance habits before tear down and where are your reports of these full context claims?The UOAs seem pretty good.
If Amsoil is so great then why can’t it clean like VRP can? Not trolling here. Earnest question. Any reports you can link to of Amsoil unsticking piston rings?
I think that it’s hard to say if Amsoil had been run since new if she would have developed an oil burner. I think that’s a big assumption. I have read though of many reports of people running Amsoil for extended intervals and getting sludged up engines.
We don’t know if Amsoil would have cleaned or not with further use in the OP’s experience. What we do know is that it was only ran for 1 interval and the VRP took 3 changes to begin having an impact on consumption (deposits slowly dissolved).
Also, I have no doubt in my mind Amsoil would have resisted the degree of deposits and oil consumption we saw with Valvoline EP as the primary lubrication.
Valvoline EP is a lower price point product. Effective much of the time, but it’s limits should be known. I actually have used Valvoline as one of my primary oil choices for years, but I’m not stuck on one brand. I’ve seen good UOAs with it but UOAs are a measure of engine health not necessarily capable of a direct oil rating extrapolation. Only how effective its use may be indicated in a given context. It can’t be generalized for every other context. Know the limitations of UOAs.
I’ve read and seen tear downs of clean, high mileage vehicles using Amsoil as another poster above highlighted. If there had been wide spread truth to running Amsoil signature products exclusively and having vehicles ruined with sludge, we would have seen those here on BITOG. I simply do not believe in that heresay. Far more experiences with people running Amsoil with good experiences. Condemning a product without full context and details is simply irresponsible.
The OP had a vehicle likely prone to this oil consumption developing. It wasn’t “caused by Valvoline” but a better oil at resisting deposits would have likely gotten better results. Look at the VRP’s results! And that’s with cleaning ability in the fully formulated product. Running clean and resisting deposits is a separate part of oil formulation and I have 100% confidence in stating Amsoil’s signature series is simply better at that than Valvoline’s other products in general. And, that it’s without question better at this if extending the interval.