This is a blast from the past!
In August 2017 Blackstone Labs published a newsletter of averages for a selected bunch of oils for the GM 5.3 liter V8 and the Subaru 2.5 liter turbo. Confirming what many Subaru enthusiasts knew at the time was Rotella T6 5W40 simply outperformed all of the various 5W30s. This was great news for Subaru turbo enthusiasts who used stage kits to push their engine past the limits! Honestly these Subaru guys were really pushing their cars on the track with vastly upgraded turbos. Im surprised they didnt go 5W50 for what they were doing!
However it was bad news for Amsoil as the averages demonstrated that cheaper oils sold at Walmart could compete with it. Pennzoil and Castrol were not far behind Amsoil.
At some point Blackstone quietly removed the report from its website. Link to a pdf copy of that report here: https://files.fm/u/z3ub627wt
In August 2017 Blackstone Labs published a newsletter of averages for a selected bunch of oils for the GM 5.3 liter V8 and the Subaru 2.5 liter turbo. Confirming what many Subaru enthusiasts knew at the time was Rotella T6 5W40 simply outperformed all of the various 5W30s. This was great news for Subaru turbo enthusiasts who used stage kits to push their engine past the limits! Honestly these Subaru guys were really pushing their cars on the track with vastly upgraded turbos. Im surprised they didnt go 5W50 for what they were doing!
However it was bad news for Amsoil as the averages demonstrated that cheaper oils sold at Walmart could compete with it. Pennzoil and Castrol were not far behind Amsoil.
At some point Blackstone quietly removed the report from its website. Link to a pdf copy of that report here: https://files.fm/u/z3ub627wt