I used redline in diffs and could tell a smoother sound from the diffs. A well lubricated feel if you would. I used the Rover Oil in the transfer case and use Amsoil in the engine. I swear by Amsoil after having an oil pressure drop in my Ferrari and was able to restore factory pressure...
By no means am I an expert but judging from what you said and the fact you replaced the thermostat, I do know that engine temperature is within the perameters of reduced engine performance. If the engine is not heating to the proper temperature or is not reading the temperature it will go into...
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