Be careful of the oil filters that many shops offering cheap oil change or coupons are using. Quality oil filters have a drain back valve which keeps the oil from draining, this feature is missing or cheaply produced causing early failure, in some of the lower priced filters. This allows the oil to drain out of the filter so there is no oil at start up. The indication is that it takes longer them normal for the oil pressure to come up and may also cause noisy lifters. This problem seems to be more prevalent in Toyota and some Chrysler products. As the price of oil increases many shops are looking for a way to cut costs and are switching to cheaper filters.