Popsy - the 1/16/2011 UOA was without MoS2, and I believe I did add before the most recent, but the Moly count on both samples is almost identical. An earlier UOA on a different engine with one can of MoS2 shows Moly at 205
In the latest fill, it definitely has 1 can LM MoS2 and 2 cans LM Motor Oil Saver (MOS), but it might be another 5 years before the next UOA! Oil capacity is 10 quarts!
Strange, then maybe a Blackstone error ?
So, this was a 5 years old fill? Nice! Considering the metallurgy from this era, the carb setup, and no oil filter, I don't think it looks bad, I guess we can't compare with an uoa from a "modern" engine.
Not pressurized coolant system, and technically not thermosyphon as there is a water pump to help it circulate. My 1925 has no water pump and is thermosyphon.
Popsy - believe it's a user rather than Blackstone error. The current fill definitely has the additives, but the previous, which this report covers, probably didn't.
I believe my tag: 1937 Alvis Speed 25 HDEO 15W40 w LM MoS2 is now accurate, but wasn't then.