Reviews of AMSOIL engine oil

Amsoil is just an above average full synthetic oil. It's nothing magical. It has a higher than normal "Total Base Number", which is what allows it to go longer between changes without going acidic.

I use Amsoil 0w40 or Eneos 0w50 in mine. For sealing and shear resistance for metal to metal contact, thicker is better.

I've used amsoil 5w40 European formula ir worked great for when it was a street car, switched to royal purple 5w-40 due to a recommendation and immediately regretted it, tons of blow by I didn't have before. Dumped the royal purple CRAP as soon as possible, just a few miles on it.

I run amsoil Signature 0w20.

I ended up returning the Castrol Edge 5W-40 and got AMSOIL European Car Formula 5W-30 Improved ESP Synthetic Motor Oil instead, which is VW Approved and 504 spec. Its quite pricey though, $180 CAD for 12 x 946ml.

I did have a 1982 diesel Jetta go 435,000 miles on oem int. shaft bearings. I had access to a lot of free Amsoil back then....so, that may have helped. However, I think it over-lubed the cylinder walls though. Rings weren't exactly what you would call 'tight.'

Amsoil XL 5W-30 in my 2016. Swapped with a new OEM filter every 6K.

I used Amsoil 5w40 European Car formula or Gulf 5w40 Formula G in my A6 previously. Technically Amsoil doesn't have the have the VW 502 00, 505 00 certifications so I think I will start using Gulf Formula G or GX exclusively in my R, either the 5w40 or 5w30 grade.

FWIW, I've run AMSoil in my 2003 WRX since new, and I like it. What actually sold me on it was when I did my first oil change. The used oil still feels new when you run it over your fingers. And the engine still runs just fine.

I'm one of those people that uses Amsoil. I use their European 5w40 and change the oil every 10K or 1 year, whichever occurs first. Never needed to add any oil between changes.