Engine oil AMSOIL or OEM Honda

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.

But I run Amsoil signature blend in my vehicles. And I also push 15,000-25,000 miles per change.

I have seen my friends and family use amsoil for 25000kms each change and their cars do 200k- 300k without any engine issues.

I already added to engine oil and transmission. 5mpg improvement avg. already.

Switch to Amsoil products and go every 6,000. I honestly would go every 7500 with it if it was me driving that much.

Send your used oil to Blackstone or Amsoil for analysis and all of your questions about oil will be answered.

I ran 10W-50 and 10W-60 for a few years in an old and beaten up Honda in the hope of reduce oil consumption to avoid having to open the engine. Long story short: it's not harmful, it's an expensive gimmick, the only real-life effect is fuel consumption will slightly worsen and that Honda had occasional issues with VTEC (a well known issue in those engines when running high viscosity oils).

Amsoil's biggest 'benefit' is a longer service life. Their additive pack doesn't break down as quickly, so you can run it longer between oil changes. However, if you're paying twice as much and running it twice as long, it's a wash and you're not gaining anything. When I was selling Amsoil, I had a modified 4 banger and a high mileage 24v that had both been running Rotella for the entire time that I owned them before switching to T6 when it was introduced. I pulled UOA samples every 1k miles, then switched to Amsoil Signature after 5k and did the same thing except I pushed the Cummins to 10k. Zero improvement in fuel dilution, wear markers, or carbon build-up. After seeing there was no real-world benefit, I stopped selling it. I won't market a product I don't believe in, let alone one that I see as an outright scam.