If you have a high mileage engine there isn't going to be any real harm in adding a seal softening agent to the engine's oil. After years of heat cycling and age those seals have a tendency to harden. On the Duratec, this means the shaft type seals and the pre-shaped O-ring type seals such as used on the timing covers and valve covers. The most 'built' 3.0L is probably Rick's (Buckshot) or Jim/Scotts (BeyondloadedSE). They both have forged pistons and rods. Ricks car is S/C'ed }~400fwp and Jims/Scotts car is turbocharged but they are still working out the bugs on it. IIRC, Rick's car is actually putting down hte most HP right now. Updated on February 6, 2023. The Duratec 3.3 is the latest iteration of the Ford naturally aspirated V6. It directly evolved from the 3.7 and 3.5 engines, with every new generation being smaller, more efficient, and more powerful. When you get to the larger HR models, the difference is having the lower rear axle ratio on the EcoBoost than the 3.5L PFDI engine. In the RWD models, the difference can be getting the 3.31 ratio versus the 3.73 ratio or even the 4.10 ratio in the HR models. This gives you lower RPMs that can calculate to better fuel mileage. The 2.4 Ecotec is a 2.4-liter four-cylinder gasoline naturally aspirated engine debuted in 2006. General Motors produced this 2.4 inline-four for a wide variety of compact and midsize vehicles such as Chevrolet Malibu, Equinox, HHR, Saturn Ion, Aura, Vue, Pontiac G5, G6, Buick Regal, and more. The 2.4 Ecotec remained on the market through 2019. Duratec Vs. Vulcan (Ford V6s) General Discussion. RedLines June 3, 2013, 6:48am 1. Which do you think is better and why? asemaster June 3, 2013, 7:10am 2. The 3.0 Vulcan is, in my opinion, the most reliable, durable, bulletproof, indestructable V6 engine ever seen on the American road. They never break, save for instances of severe neglect or 2011 F-150’s Base 3.7L Duratec V6 Engine Brings 6,100-pound Towing Capacity. Borrowed from the 2011 Ford Mustang, the 3.7-liter Duratec V6 is the base engine for the 2011 Ford F-150. It packs 305 horsepower and 280 lb.-ft. of torque. While less powerful than other 2011 Ford F-150 engines, the 3.7L V6 can tow up to an impressive 6,100 pounds. The engine uses an internal combustion engine with a turbocharged Four-stroke type. T. he engine is also equipped with a Power of 280-350 hp (209-261 kW) / 5,500-5,600 with Torque of 305-350 lb-ft (414-475 Nm) / 2,750-3,200. Shoot command using the 1-3-4-2 system. The engine oil weight is SAE 5W-30 with an engine oil capacity of 5.4 l (5.7 qt). .

is the 3.5 duratec a good engine