"to me" 1993 FZJ80. There is some residual oil film all over. Does not seem fresh. Guy had $4600 worth of work done about 12,000 miles ago. Birf rebuild repack, new seals, etc... The truck has 185,000 on it now. Is there supposed to be some residule grease build-up on the birf domes? Seems normal, I am just paranoid about my new purchase. Now, I know there are threads on this but no conclusions, should I switch to Synthetic in the engine at 185K?? I have heard arguments on both sides. BTW, so far, you guys and your information have been fantastic. I only have one complaint....I am losing sleep staying up all night reading all of this "stuff". I know I am rambling but if anyone would chime in... My house needs work, what the hell am I doing???