Attached is my recent VOA for Amsoil 5W-30 Signature Series, Manufacturer date is 020619. Particle Count included. This was a bottle sample. The AC Delco 5W-30 Dexos Gen 2 with 115ppm of boron became quickly depleted(after 1700m), I assume the cause is from GDI fuel dilution, so I am hoping the higher amount will help. All other additives remain constant. AC Delco VOA showed a 5 abs/cm whereas Amsoil has it at 45. Similar for Amsoil 0W-30 in other VOAs posted on the forum. These oxidation numbers increase as the oil is used, but why such a high starting value? Oxygen exposure does cause oxidation but not that much.. I was disappointed in the TBN results. Not blaming Amsoil, but the test method. The spec sheet is current as of 9/2018. Everything I have read the ASTM D4739 will not show the full reserve alkalinity, typically 1-2 points lower. This is 3.6 points below Amsoil spec sheet. Has Polaris gone with an even weaker test medium(acid) for TBN? Once the TBN reaches 25% reserve, will this BN measurement be more accurate, or should we add 2-3 points to the results to get the real value? My goal is longer drain intervals, but it may be limited by fuel dilution, which so far is running 4-5% (GC), or 2% using BSL flashpoint. I have a data file of 568 UOAs for the GM Ecotec 2.4L (2006-2017) with and without GDI. Very interesting results of Iron wear, fuel dilution, and viscosity breakdown. Typical does not equate to normal as some labs suggest and increased wear rates are seen, coupled with viscosity loss even within the first 2500 miles. Non GDI fair much better and remains in grade even up to 10K miles. I will post the file soon.