I have a 97 Jeep Wrangler with a overly powerful 4 cylinder. when it originally came from the factory DaimlerChrysler recommended gl3 your lube. they have some updated the spec to include 10w30 oil. is there any engine oil that sticks out in anybody's mind as being superior in this application? other people have also used sincromesh, would that be any better? currently just fine but the previous owners didn't really do any maintenance so I'm playing catch up. also any reviews on what I should stick into the transfer case? Thanks