Engine oil RED LINE or AMSOIL

It looks like even with the mileage difference, Amsoil still outperformed in most categories. Pretty impressive.

I decided to make the switch to Amsoil Signature Series because I see people switch to it and report no oil loss.

I use only Redline for all my oils-fluids. For engine oil, I have used 10w40 consistently.

I recently switched from Liqui Moly to Amsoil recently, my wife's Tiguan seems to run a little smoother and is noticeably quieter at idle with the 5-40 European car formula.

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.

Used to use Motul, now switched to Red Line for the higher zinc content and high heat stability. I rallycross my daily so high RPM and high heat.

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

I run amsoil Signature 0w20.

Redline 5w 40 since break-in, 254k miles later engine still going strong. Plenty of other repairs done, but no internal engine repairs required.

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.