Im a huge Amsoil fan and an independent dealer for Amsoil, but that info is about previous oil formulations. Looking at oil analysis has shown T6 has gotten better with the current formulation. The cleanist oil analysis ive seen yet with our ecodiesels was running Mobil 1 but I have not seen many oil analysis running the current spec from Amsoil.

 

I've been running the Amsoil Signature series DEO oil and am impressed with my OA that are posted here. I'm on a 4,000km trip and will be posting a 15,000 or 16,000km oil run shortly.

 

That article was dated 2016. That's about the time FCA changed the oil recommendations. If Amsoil was good then, it's probably good now. If T6 is no better in formulation, maybe it caught up to the old Amsoil.

Both look better than the original 5-30 recommendation.

 

None of the statistics quoted in the Amsoil article mean anything. Remember 200 hours at 50 mph = 10,000 miles and 250 hours at 40 mph = 10,000 miles. TBN goes down based upon volume of fuel consumed and sulfur content in fuel. As long as the TBN is clearly above 0, say 1 or 2 when you change the oil it is adequate and higher isn't better. Whether it is 7 or 10 when you change oil makes no difference. Infact the higher it is the more money you have wasted on additive you do not need. TBN is important but not the issue it was in the days of high sulfur fuel. The original Pennzoil Ultra had a starting TBN of about 6.

I don't know what T6 Amsoil tested but it is clear from the oil test results posted on this forum that those using the current and previous 5w40T6 have viscosities much higher than the Amsoil article reports at oil change time and no oil analysis firms have made negative comments about the T6 viscosity at reasonable oil change intervals.

I have been an Amsoil fan for many years and have used it in most things I own. However now that Shell, Exxon, Chevron and other reputable major oil companies are making full synthetic oil available to the general public at big box stores and auto parts stores the premium for Amsoil seems hard to justify for me. I do still use it for 2 cycle oil and in air cooled motorcycles where I do think 'the best' is worth the cost given the lubrication challenges in those applications.

bticbw