I've been using the Rotella Syn for a couple years now and have no issues with it. My slippage started well before the introduction of the Rotella but the symptoms were the same as yours. You should be fine after the Barnett's springs.
Yeh but what oil were ya running before the rotella that may have also had not alway wet clutch freidnly fric mods or less zddp that not FT cam friendly either which is the more important of the 2 issues?
Anyway,if your running rotella T6 5-40 it still has just enough zddp/1200ppm whats considered minimum protection for a stock mild FT cam application vs for example rotella T 15-40 that has slightly less then 1200ppm zddp.
You seem to know bikes pretty well and wonder why for a few $$ more why you wont simply run oil that's specifically mfg'd with proper additive pkg designed for an old school air cooled FT cam'd motorcyle motor like the RS
I am sure some of the 6-7 or so FT cam/lifter failures we have seen here in RSC over the ast yr or were caused by running improper pass car or truck oil with too low zddp lvl.thats for sure.
That was a real issue with FT cam'd classic car motors untill people got on board with the changes in the oil industry and it can affect the Ft cam/lifters in the RS the same way too!
I just dont undertstand or see any sence when so many guys here in RSC that really like thier bikes caring well for them then on the other hand refusing to spend a measly $10-12 more to buy proper motorcycle oil ?
With motorcyle oils like Amsoil mcv or mobil-1 v-twin both full syn in 20-50 with a much better 1400-1700ppm zddp lvl for significantly better protection of the FT cam & lifters in the RS motor & better protection from the extreem heat generated by the lrg old school air cooled RS motor too along with no fric mod that arent always wet clutch friendly either?
Just makes no sence to me to forgo/give up all that additional protection the Asmoil or Mobil-1 bike oils provide for no reason other then to save $10-12 per oil change on 4qts of oil to purposely run pass car/truck oil that of course protects ok th at we know wont gernade the RS motor but it's defiantely not the best choice protection for the RS motor either.