assalam,

try the new Dexron VI or Duradrive Synthetic ATF if you want...

sarjantulang

perhaps give it a full flush including replace the ATF filter (which will likely require gasket replacement too)
if still persist, perhaps give lubegard a try then.

personally, id recommend against using lubricants to solve problems because they are additives which helps elevate problems and doesn't solve the root cause of a problem.

then again with what so many people claims of it working/solving their problems (including my own experiences), why the hell not right? lol

that depends on your car's gasket/filter cost, and of course the extra liters needed for a flushing.

not familiar with sentra, you'll need to check spare part shops/tan chong centers