Engine oil Shell or Motorcraft

I live in a dusty climate I change my oil at least annually and I use Mobil one in my Volvo, Kirkland synthetic in the kids cars, and rotella in my air cooled vw.

I use Rotella T6 5W40 on my stock motor STI.

now im using shell long ride currently at 1500km and i havent feel any vibration yet and its cheaper than amsoil.

Rotella T6 15W-40 in the perfectly sized 2.5 gallon jug. I’ve run this in both LML’s since day 1 and combined it’s over 500,000 miles.

I have 2015 sportwagon tdi and use shell rotella t6 5w 40 . I have 340000 miles on and runs fine.

I’ve been running shell T6 in my STI forever with no issues.

Haven’t been happier since I switched to Rotella 5w-30 synthetic, the motor purrrsss and burns a 1/4 of the oil.

T6 Rotella 5w-40 when I run test pipes on tune, the heavy weight is great for keeping oil temps down and the zinc is awesome as a friction inhibitor but is terrible for cats so when I’m going to pass emissions I run Kirkland 5w-30 full synth on stock cats.

Shell Advance Ultra for scooters. Mahal pero kalidad. Change every 2k - 2.5k. You can extend a bit more observe mo lang performance ng makina every interval.

I've used a number of different oils in my XS400 over the past couple years, can't say I've noticed much of a difference other than when I used a 15W40 the engine was a lot noisier, going back to 20W50 and the engine quieted down a lot.