doesn't really matter, the only reason to let it warm up first is to have a working heater, but if you need that in SF you're a wimp grin the bypass filter doesn't affect oiling

Bill


Moved over to the Passing Lane

"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir
"When we tug a single thing on an old truck, we find it falls off" ~ me
Some TF series details & TF heater pics