called in for an emergency job last night. coast live oak fell onto neigbors house. 40 footer, maybe 50, whole crown on roof. smashed water heater panels and punched a couple holes in the roof. brushed it out enuf to get a tarp on the roof and called it a night. back today, brushed the rest, cut the wood down to load bearing limbs, then propped a couple rounds under the trunk (no other trees to tie it off to) and cut it free. everything went great till i was cutting big rounds and the bar and chain started to build up what i can only call varnish. it always happens cutting live oak, this time it was so bad that the chain locked up on the bar. i went through 3 saws to get the job done. i know that simple green works great for getting the varnish off, but i wonder if you guys have any tricks to keep it happening in the first place. i might try mixing a little diesel in the bar oil next time, see if that helps. all in all, a good day. oh, btw, all the roots were rotten, and we just pruned the tree in oct/nov.