When I bought my truck the guy gave me 2 was of unopened aft+4 fluid. He had changed the fluid and installed a deep sump pan and temp gauge and replaced the fluid annually. Well I am getting ready to go on vac and checked the fluid and its down just a bit so I opened a new bottle and I thought it smelled bad in the bottle. Is this normal or has this stuff went south setting in the bottle? I didn't see a date on bottle but it was sealed when I opened it up.
Thanks
Thanks