Royal Purple
Synthetic is synthetic. AMSOIL invented synthetic oil and have perfected the formula (as as well as their tranny and gear oils...along with their filters) and others are just doing their best to make it as close to AMSOIL but just come in as a close 2nd.
Just that Royal P and Mobile1 and the others have the marketing edge (sometimes, it's just the name alone that does the selling in which the product itself could be a bit substandard) over AMSOIL since the others are an on-the-shelf item. AMSOIL can be only purchased via misc outlets that sells the product on the side.
If I had a motor that has just been rebuilt I'd break it in with dino oils until the rings have fully seated, then head on over to the synthetics. Interestingly enough, as stated, synthetic is really synthetic since it all contains the basic same molecular basis of being the same size whereas dino oils have multisized oil molecules preventing full lubrication, will eventually evaporate which causes the product to wear down faster - is the reason of the 3k oil changes.
Even when a motor that has been torn down with over 200k on it and has been using AMSOIL, there is absolutely no wear and a very clean motor which can be put back together with the original parts and go for more miles.
It really all depends on what you want to use.
Just that Royal P and Mobile1 and the others have the marketing edge (sometimes, it's just the name alone that does the selling in which the product itself could be a bit substandard) over AMSOIL since the others are an on-the-shelf item. AMSOIL can be only purchased via misc outlets that sells the product on the side.
If I had a motor that has just been rebuilt I'd break it in with dino oils until the rings have fully seated, then head on over to the synthetics. Interestingly enough, as stated, synthetic is really synthetic since it all contains the basic same molecular basis of being the same size whereas dino oils have multisized oil molecules preventing full lubrication, will eventually evaporate which causes the product to wear down faster - is the reason of the 3k oil changes.
Even when a motor that has been torn down with over 200k on it and has been using AMSOIL, there is absolutely no wear and a very clean motor which can be put back together with the original parts and go for more miles.
It really all depends on what you want to use.


