The Jeep 4.0 is known to be a noisey engine, and I've had a few people suggest Lucas Oil Stabilizer. They claim it does wonders to quiet the engine down. The only additive I trust so far is MMO. I watched one guy pour the Lucas into his engine and it looked like honey pouring out of the bottle it was so thick. Wouldn't that be very bad for cold starts? Whats the viscosity of this stuff? I don't know much about it so just figured I'd ask.