Used all Fel-Pro to seal a Ford V6 intake. It worked fine. The Japanese applications seem hit or miss, for my car, the Fel-Pro gasket for the valve cover was a repackaged OE. For Japanese cars, the aftermarket gaskets are Ishino-Stone, a division of NOK or Freudenberg Japan. Iāve used a few Stone VC gaskets and seals on a Honda with luck.
Mahle and Victor Reinz are OE suppliers AFAIK, Fel-Proās PermaDryPlus and PermaTorqueMLS seem to be āproblem-solverā parts for the aftermarket that work. Driv hasnāt ruined Fel-Pro⦠yet. Else, if the return rates are high, the aftermarket will be seeking a new supplier.