Originally Posted by richie_s999
Switching to and from synthetic oil will not harm an engine, it's even sold mixed in a bottle (semi syn)
I ran 15w50 syn. Check the owners manual and just keep within spec
I appreciate your input but I wasn't concerned about engine damage, it is the seals that are in question. I am well aware about the manual and its recommendations but I was looking for some from those who track their cars regularly.
Any other recommendations out there?
Thank you to those who have responded so far!