The vehicle in question is a 2000 Jeep Wrangler Sport w/ 4.0L, 79,000 miles. I want to do a filter/fluid change on the transmission, but I have a few questions:
1. The factory service manual says to use ATF+3, but evidently there is a new fluid, ATF+4, which is supposed to be compatible. However, I suspect the fluid has never been changed, so it's probably conventional ATF+3. Are there any dangers with combining ATF+3 dino with ATF+4 synthetic? I won't be pulling the torque converter or the valve body so there will still be some of the old stuff inside.
2. The service manual states that I should use 80W-90 in the differentials for standard use, and synthetic 75W-140 for towing. Are there any advantages to using 75W-140 over 80W-90? I won't be towing anything, and the hardest use it will see is light trail driving and maybe some rock crawling in the future. The auto parts store stocks valvoline synthetic in both weights, should I even consider using AMSOIL or Red Line?
Thanks for the help!
1. The factory service manual says to use ATF+3, but evidently there is a new fluid, ATF+4, which is supposed to be compatible. However, I suspect the fluid has never been changed, so it's probably conventional ATF+3. Are there any dangers with combining ATF+3 dino with ATF+4 synthetic? I won't be pulling the torque converter or the valve body so there will still be some of the old stuff inside.
2. The service manual states that I should use 80W-90 in the differentials for standard use, and synthetic 75W-140 for towing. Are there any advantages to using 75W-140 over 80W-90? I won't be towing anything, and the hardest use it will see is light trail driving and maybe some rock crawling in the future. The auto parts store stocks valvoline synthetic in both weights, should I even consider using AMSOIL or Red Line?
Thanks for the help!
