Hi I have an old 963 G been using for about 10 years as a ranch tractor and I really like it. Problem is leaks everywhere and it is extremely dirty and greasy. Now looking at Bobcat s850's and Cat 272D's. My question is should I go totally clean tier 4 or tier 3 so I don't need to mess with emissions. Part of me says maybe it would be worth is so I don't breath in the pollution. Are emissions a pain or no big deal?