Super tech synthetic oil from Walmart

down home wrote:
Stay way from Castrol Syntech.
It formed a hard red varnish in my high performance hot engines.
Castrol sued Mobil ! and won entitling them to label their highr refined Castrol Syntech as Full Synthetic oil. So Mobil ! and all the rest went that route.
Some Mobil1 Euro spec oils are now real Ester based synthetics.
Someone else here, posted a reply a few years ago with info of who was selling full synthetic here in the US Redline is one. there is a difference a in the early commercials in the seventies when the real ester based synthetics came out. You cn't hold the blade of a screwdriver dipped in it between finger and thumb. I hd to replace the gaskets in my Plymouth when I first used it. Ol was so slick and thin and it shrunk some of the gaskets designed to swell in the presence of dino oil.
Service Tech at Mercedes says my Mobil 1 oil they install is now the real deal.
Porsche and some Honda engines use their propritary real synthetic oils and ATF.
On edit Mobil sued Castrol not the other way around
Second Eruo Spec,in Europe is determined by Scientists and in the US "Synthetic" is determined in US by Business Men and the Court.

Wal Mart Syntech is supplied by different manufacturers by contracts.
Shell was the supplier for some time and Shell has no equipment to manufacture real synthetic oils. Then it was Citgo. they too did not have any equipment to manufacturer true Ester real synthetic oil.
Real synthetics look for Euro Spec real synthetic oils.
For a time mobile One had on the rear of their bottles "100& synthetic oil except for the base carrier oil." or some such and on the front 100% True Synthetic.
Royal Purple and Red Line. Amsoil just buys their "synthetic oil" from whoever and repackges it. They do sell a Euro Spec Synthetic now.