I have never used Red Line, or any other ester based, Group V synthetic. My current bike is a 2006 YZ450 that's always been run on either Amsoil MCF, MCV, or Mobil1
Racing 4T or V-Twin oils, the choice between them based primarily on the ambient temperature. All 4 of these oils are Group IV poly-alpha olefin synthetics that comply with JASO MA/MA2.
When I installed the Rekluse
in late 2010, I used the existing 4 year-old OEM
friction plates and the used steel set that came with the clutch. That setup lasted all of last racing season without a problem of any kind. At the end of the season, I decided to replace the steels because they were slightly scored when I got them the year before, and at the same time, my sponsor offered to buy a set of friction plates to go with it. As it happens, the now 5 year-old friction plates measure within specifications, are not blackened, and were not slipping, grabbing, dragging, chattering, or causing any other complaint on my part, but WTH, I decided to be preemptive anyway. The clutch has, at times been hot enough to cause the bike to belch smoke out of the breather in some of the tight spots the local clubs like to run us through, but it hasn't suffered noticeably for it. The clutch does work better now, but most of that is due to the fact that some of the old steels were slightly dished. I have no idea how much time was on the clutch kit when I bought it.
Frankly, the credit for long clutch life belongs to the quality of the OEM
plates themselves. The Rekluse
contributes to the that in that it will feather the clutch as much as necessary, but not to an excess. The oil is only a factor to the extent that it is a good, durable lubricant with the correct friction profile for a wet clutch, and esters have no particular advantage over PAO's in that regard, or for that matter a good syn/petro blend, either.