Did the interim change, engine only, to Amsoil. Level is dead nuts on and it was, at temp, right back where it should be on oil pressure.
What this tells me is indeed the Mobil V Twin crapped out on me about half way to the scheduled oil change.
I still don't know why. The bike did see a lot of high temps last season. Above 90 with a high humidity at slow speeds and/or stop and go is a killer on air cooled bikes. My bike even 100 degrees highway speeds with its factory oil cooler does just fine, but under those no air conditions the engine temp can jump as high as 220 degrees F. My bike does have the automatic one cylinder shutdown for over temp which, though enabled, didn't kick in. Its got an indicator when it does and as you can imagine a Harley running on one jug is quite noticeable. Plan is still to run the Amsoil the next couple of thousand miles then change all the oils to get them on the same schedule.
Good news and quite impressed is there was zero shavings on the magnetic tip on the oil plug. I mean none. The used oil was dark but not dirty. It just apparently overheated and broke down. It is something the Amsoil is rated specifically for and higher than Mobil 1 V Twin.
Prior to this monster, my last two bikes were water cooled. Even at extreme conditions and at the scheduled mileage change the Mobil 1 V Twin was still in great shape. Air cooled is harder. Years ago on the inlines, man you couldn't go miles at all on oil changes. Those side by side jugs got damn hot and back then there was no such thing as synthetic oil. Late 70s early 80's I use to use Valvoline 20-50 racing oil. It was the cats meow. Then Valvoline changed their formula, went away from PA crude and started adding cracked coal oil. I then switched to Castrol GTX, which btw still gets rating almost but not quite rivaling the synthetics. Synthetic I switched to Mobil 1 then later Mobil 1 V Twin. Now it looks like I'm switching again. My gut tells me the HD oil outperformed the Mobil 1 V Twin in this 103 cu in air cooled monster.
I don't know who makes Harley oil for sure. I do know its sp0ecifically formulated to meet their specs and who has changed over the years. I suspect its Amsoil these days because like the bike washing chemicals they private label, the Harley shops carry both brands. When I bought the Amsoil i put in, I bought the oil from Harley. Another example, Harley sales both S100 cleaning products and their own private label and they are the same company. In the case the cleaning stuff, the Harley branded stuff is less expensive. Oil, however the Amsoil is.
Let me get some more saddle time on the Amsoil and I'll let you know how its doing. It may take a while. Temps will be high today here but then we're in for a cool spell. I should be able to tell by pressure variances.
BTW, Digital information on a vehicle is some damn high tech stuff and I have grown to understand why these new Harley's cost as much as a car. They have more high tech shat on them than a car. Some of this stuff is amazing. My bike, for example, will even compensate automatically without reprogramming the air to fuel ration for exhaust changes, within limits of course. Buying exhausts use to be slap it on there, adjust the carb. Now its read the exhaust pipe manufacturer info, match up your year and engine, then see if it needs a reprogram or not. A lot of riders are oblivious to this stuff. I have a riding pal that only uses ethnol free gas and changed his pipes probably three times without a reprogram, runs some Vance and Hines now, and man you can smell the gas coming out the exhaust when he romps on it. One set of pipes I forgot the branding, his pipes use to get so hot, he'd have to pull over and let them cool. It takes a little more knowing what you are doing these days but it still beats having to screw with the damn carbs all the time.
I'm finding out oil isn't much different. Need to give it some thought and its not conventional thought. These are some state of the art machines these days and there's a reason the new Harley's, despite being air cooled, are going high mileage before rebuilds. I have a buddy, a real saddle nut, that puts over 300,000 miles on his Harley's with only one rebuild. Amazing for an air cooled machine.