I had the same results with T6. Triple T 15/40 did better but didn't like cooler weather. The last 5000 miles I ran Mobile 1 and it stayed quiet the entire cycle without Archoil 9100, idle rpm oil pressure stayed the same also. This change I added the 9100 to Mobile 1 to see how it does. I'm waiting for the results from Blackstone to see if the viscosity matches what I am hearing.

 

It appeared to me, when I used it, that the Archoil reduces the viscosity somewhat.

 

My SUS vis was 61.9 and the cSt vis was 10.75 with the Mobil 1 and no Archoil in the oil, with TripleT and Archoil the numbers were 65.5 and 11.74.

 

A 61.9 / 10.75 viscosity is unusual IMO. In all of the UOA I have done and all the oils tried, I have never seen any 5W40 that low after 5000 miles (had a 63.4 and a 64.2 w/ Valvoline PBE, one 63.4 w/ T6 and ZDDP, and a 63.3 w/ TDT and Archoil at 6k miles - all others over 66). What oil did you run before the Mobil 1 oil change? One theory I have heard discussed though is that the early HPOP was harder on oil than the later ones - I wonder.

 

I am skeptical of the report, the idle hot oil pressure was still the same as new oil and the engine was quiet. I'm waiting for sample bottles from another company and will see what they show.

 

I run Royal Purple 20W-50 synthetic motor oil in my X since I bought it with 13K on the clock. It now has 120K on the clock. No HPOP, injector or turbo replacement. I have RP tranny fluid, Synchromax in the transfer case and 75W-140 Max Gear oil in the diff. All have AR9100 for the past 6 months. I normally change motor oil at 10K to 12K intervals.

Ed

 

And 5000 miles on any synthetic 5W-40 oil is really not much......

 

My old motor was this way and I always changed it by starting/stiction/injector "issues" rather than mileage. It liked 15w40 Motorcraft better than any synthetic so that's what I ran. This motor isn't that way at all. If I didn't watch the mileage I wouldn't know that the oil had 5K on it at all.

 

It's funny, I swear some of these motors have individual personalities.

 

That was something I was concerned about, seeing how the Archoil is just a tad thicker than water. But then 1 qt of it with 13 qts of 30 weight may not make much difference.

For an oil sample...The viscosity at 100C....is that the upper viscosity #? (as in 30 on the 10-30?)

 

This might help

Archoil 9100 mixes 16oz to 15 qts oil not 32oz.

 

Yeah this next change I'm Gona run delvac esp. And see if it likes that any better

 

Here's an oil sample report on the oil with 4206 miles on it. I blacked out info that did not apply to this sample. Also, I did not get a virgin sample, I had none left to test..... besides, I'm sure there are some on the internet somewhere....

 

I have a t6 and archoil report coming in soon if you all want to see that, it will have 6000 on it

 

The viscosity of virgin T5 10W30 is somewhere around 11.5 to 11.7 cSt. So a 4200 mile viscosity of 9.8 cSt, shows some significant shearing - almost down to a 20 wt (9.29 cSt). I assume that you did not have any significant fuel dilution?

http://www.bobistheoilguy.com/forums...5_#Post1791357