Join Date: Feb 2010
Location: Petawawa, Ontario
When I used to own a Nissan Xterra, I did the Seafoam thing exactly like Firebalt said, and I NEVER saw any negative changes. it works really well and improves gas mileage a lot. After you put the Seafoam in your crankcase, the most you should drive is about 50-60 km. Anymore than that and you start to hurt your engine. You just need to drive enough to get the Seafoam all through your engine a few times to clean it out. After that, definitely change your oil, and you'll see some awesome improvements. You also don't have to do it every 2 oil changes, you can if you want, but it's not necessary. Maybe every 5 or so. It takes a while to build up the crap that Seafoam removes, so every 5 sounds like a good amount of time between applications. Happy Seafoaming!!