When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Unless they have been done regularly, it can cause more trouble than it's worth. However, 5 years old you could get away with out much trouble if the motor is in good shape.
Here's the kicker. You will find a lot of snake oil in your parts store. If you want a good job, you should look around for a motorvac rep or get a can of sea foam. those are the only two products I have heard had repetitive success.
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Slideshow: The VelociRaptor Expedition gains a lift, upgraded suspension, Brembo brakes, and trail-ready equipment while retaining the stock 440-horsepower EcoBoost V6.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.