Before I got a company vehicle, I was changing my oil about every 6-8 weeks, so it was pretty easy to remember the filter part number. I've used the same oil (Castrol) for many years, and every truck I've had up until the Dodge Ram I just bought took 6 quarts. My new one takes 7. For many years, I used the K&N air filter, and just had to clean it, but I gave up about 250k miles with my last truck. I saw no benefit in power or gas mileage, so I figure its worth $12 not to have to clean and reoil. The chemicals probably cost me half of the cost of a new filter every time I cleaned it. Ironically, I just bought a Oil Filter today for my Ram Hemi and it takes the same filter as the 4.8 Liter that was in my Silverado. I guess remembering the filter number will be pretty easy for this truck too. BTW, I don't change my own oil, I buy the oil and filter and pay the Quick Lube $20 to do the work. Doesn't save me any money over using their Oil and Filter, but I know what is going in my engine. I don't trust oil that comes out of a hose in the ceiling and I know the filters they use are the cheapest on the market. And on top of that its worth $20 to not have to find a place to dump it.