You need to drain some coolant first, BEFORE pulling the LIM off, as the LIM holds quite a bit of coolant. Otherwise, you will risk water contamination in your oil. Regardless, you will inevitably get some coolant into the lifter valley. I would also highly recommend pouring a quart of dino oil into the lifter valley after removing the LIM to flush any traces of coolant through. Finally, drain the oil and refill once the LIM is bolted back on. Good luck...