Engine oil PENNZOIL or AMSOIL

Amsoil Signature 0-30 ,Tokyo Roki Black Japan filter only and 5000k, soon to be switching to 0-40

Penzoil Ultra Platinum 0-W20 @3-4K and Mobile 1 Extended Performance Oil Filter. I like that Penzoil derives their oil from natural gas.

My 05 Corolla had one oil change at 800 miles, one at 10,000 miles, and then once per year for 14 years until it was totalled at 330k miles.

I\u2019ve been using Amsoil Sig Series ever since my first break-in oil change. I used it in my old turbo Cobalt SS that I drove like a jackass when I was younger too. Never had any engine issues and Blackstone analysis shows that up to a 4,500 mile oil change interval is safe for my WRX.

Amsoil always over anyone. I started with AMSOIL in 2004 and after pulling my Hayabusa Engine @ 20k miles to build for a turbo kit, the engine teardown was perfect, the block, pistons and bearings looked entirely new.

Have noticed on several times that when I went from Subaru OEM oil to Amsoil BACK to OEM that it runs much quieter and smoother on Amsoil.

Pennzoil Ultra Platinum has some of the best cold flow characteristics so I'm not in a hurry to change it even though it's 5W-30.

From what I've learned the best oil for the Turbo of any model with direct injection which Mazda uses is Pennzoil Ultra Platinum.

I have amsoil in mine. I went 7500 once. Im sure anyone can go 10k with amsoil but it will be dark oil when u change it out lol

BMW switched from Castrol to Penzoil years ago...but both cause oil starvation in The S65 motor