I picked up an 08, 5.7 rwd with 108k on it. Have a question on the spark plugs, as I will be changing them for preventive maintenance. Is the Autolite platinum good in a 5.7 and will it last longer than the 30k oem plug? Don't need 100k change intervals but 50-60k would be nice and the Autolites are 3 bucks apiece locally. I've looked around online but haven't found anything definitive. Any other tips for preventive maintenace would also be appreciated. So far I've changed out the engine + trans fluid&filter, and the gear oil in the rear diff.