When you changed the oil did use you plain 10-40w car oil?
Assuming you ran in the TDM on the road how hard did you ride her?
I changed out the dealer oil as soon as I got her home. They used a semi-synthetic M/C oil. I put plain old 15W40 car engine oil in.
change that & the filter at 100k, put some more 15w40 ( or similar ) change that & filter again at about 1500k.
I constantly varied the revs up to the Redline NOT into it! Hard acceleration but done in a safe place.
After that put a good FULLY Synthetic oil ( 10w40 / 50 ) in Bike or car, your choice. I have used fully synthetic car oil in several bikes for years & had no problems.
The levels of nasties like phosphorus have had to be removed since the introduction of catalytic converters in car exhausts so
I reckon the oil companies are just trying to scare Bikers into paying 4 times as much for Bike oil that is little different from car oil these days.
EXCEPT for the latest low viscosity ENERGY CONSERVING car oils. DO NOT USE THOSE EVER in your bike! As for Dapleb & no evidence. I still say look at Motoman's Photos. What would he have to gain from giving BAD advise apart from threat of death from
very upset bikers! Quite the contrary, from what I read they support his method.
If you read the plethora of info' about oils on the web you could go barmy! I based my decision to go with Motoman's method on the experience of blokes who have
been doing pretty much the same as him for 20years or more & with good results.
Get as much advise as you can, but in the end
only you can make the decision.