if you are going synthetic, i would replace a quart of oil with a quart of lucas synthetic oil stablizer, and then 4 quarts of oil. and dont forget to put oil in the new filter befor putting it on. pour some oil in the filter, swirl it around for a minute, and then pour some more in there, swirl, and then install. some oil will come out when you put it up there , but its not completly dry. hope that makes sense.
dave