Castrol EDGE?
I have an interesting history as mobil1 did not exist when my engine was made. Castrol plain and simple simply won.
Then it was castrol high mileage. As it turned out my engine did not need the modern equivelant of goop in a bottle, it does work if you have a seeping head.
I then tried syntec blend after many years of regular crap oil, and that was nice. I then went to mobil1 in its 22nd year and that took a few days of squeezing something watery gassy something, but very nice, my fuel went back to the high 40s. when the engine was put to trial from urethsne paint, flux core smoke, and the channels the engine sucks on from the unibody (strange but subaru true) the mobil1 simply let it burn.
The only problem left is..the engine loves 10w30, but the time it takes to get to WOT does not make 10w30 good. The boxer is a super lubed very very cold runner even with a racer ignition coil.That is where this next change in oil may come from.. does anyone use this castrol edge? It claims to have some thing called POA, a comlex chain that works wonders at low temps, and castrol claims it has 8 times the durability of mobil1. After the chemistry episode I went through, watching it burn, I still do not like mobil1. Should I try this claim? Assume extinct engine, all original, going on 23...