Can I use GM Dextron III H Transmission Fluid in a 1998 Subaru Legacy?

No, you should not use GM Dexron III H Transmission Fluid in a 1998 Subaru Legacy. Subaru vehicles typically require their own specific type of automatic transmission fluid (ATF), such as Subaru ATF or a compatible equivalent. Using the wrong fluid can lead to transmission issues and may void warranties. Always refer to the owner's manual for the correct fluid specifications.