FORD 6.4 L Powerstroke Amsoil Product Recommendations

The 6.4 Power Stroke uses a canister element oil filter on top of the engine. The AMSOIL Absolute Efficiency Synthetic Oil Filter for the 6.4 PSD is Part #EAO-88 EACH 1 Filter and has a change interval specification of 25,000-miles/1-year. It filters to 15 microns with 98.7% absolute efficiency. No other company has an oil filter that has these specifications except AMSOIL. When using the EAO-88 on your 2008 6.4L change it when you change the oil as per manf. specs unless you are doing oil analysis to extend oil changes.

6.4L Power Stroke engines have an EGR system and Diesel Particulate Filter (DPF) on the exhaust system and must use the AMSOIL Synthetic 5W-40 Premium API CJ-4 Diesel Oil, product code DEO. 4 gallons of DEO part # DEO-1G CASE. Single gallons and quarts are also available. Pricing is on page 7 of the Wholesale Price List. This is the only choice due to the DPF. The change interval is recommended for the longest service interval established by the engine, vehicle or equipment manufacturer. Drain intervals may be extended based on oil analysis.

Note: As time goes by and we gather oil analysis data on the 6.4L with the DPF the 5W-40 may possibly be specified for longer intervals (25,000 miles/1-year) like the 6.0L is, however it is too new to have any significant oil analysis field data. Right now the only way to use it beyond Ford specs is to perform oil analysis testing, preferably in conjunction with by-pass filtration. I have photos of the by-pass system on both 6.0 and 6.4L engines, they both have similar mounting.

If you are interested in by-pass oil filtration we offer an AMSOIL by-pass system specifically for the 6.4 Powerstroke. The AMSOIL by-pass system is a superior filtration system that utilizes advanced filtration technology to provide your engine with a continuous, contaminate free flow of lube oil. Parts Required:

  • AMSOIL Aluminum Billet Oil Filter Cap (part # BK-1101)
  • Aluminum Billet Oil Fill Cap (part # BK-1102)
  • BP-242 90 Degree JIC Elbows (4 reqd.)
  • One BMK-11 Single Remote By-Pass System
  • One EABP-100 By-Pass Filter
  • Note that bracketry fabrication is necessary as well as the purchase of extra hydraulic line. Please contact me for more specific information and ordering.

The 5-speed Torqshift automatic transmission uses the AMSOIL Universal ATF which is recommended for the Ford SP specification. The change interval specification is 100,000 miles under normal service or 50,000 miles for severe service.

The front and rear differentials use the AMSOIL Severe Gear 75W-140 Gear Lube. No friction modifier is required. AMSOIL does offer a friction modifier called Slip Lock in the rare event that a limited slip differential develops chatter on turns.

Note that 75W-90 gear lube is recommended by many other manufacturers because it is more fuel efficient that a 75W-140. Ford uses a 75W-140 synthetic gear lube in the rear axles of all production trucks. Chevy prefers 75W-90 mainly due to fuel economy concerns for CAFE. I personally recommend the AMSOIL Severe Gear 75W-140 because during extensive severe durability testing performed by Ford and Dana, the 75W-140 outperformed the 75W-90. That does not mean the 75W-90 is not good to use, just that the 75W-140 is better under certain severe conditions. Also, most front differentials recommend 75W-90 or 80W-90 because the front axle is typically not used very much so they can get by with a lower cost oil. You do not need AMSOIL Slip Lock friction modifier or the manufacturer brand friction modifier unless you hear chatter on turns, which only happens in a very small percentage of applications. In some rare cases, if you do hear chatter on turns, then you will need to install a bottle of AMSOIL's Slip-Lock Differential Additive (Product Code: ADA). Its convenient flip-top dispenser provides quick and easy application to the gear housing. One four-ounce bottle of Slip-Lock treats differential capacities of two to four quarts.

AMSOIL Diesel Concentrate Performance Fuel Additive

AMSOIL Diesel Concentrate (ADF) provides maximum diesel operating efficiency. It compensates for the variances in quality of different fuels (including biodiesel) and the deficiencies of today’s Ultra Low Sulfur Diesel fuel (ULSD) for better engine operation. New engine technology, tighter tolerances and emissions regulations require high quality diesel fuel for long-term engine operatibility. AMSOIL Diesel Concentrate improves diesel fuel quality to exceed today’s stringent performance requirements. AMSOIL Diesel Concentrate extends equipment life, lowers operating costs and improves diesel performance. AMSOIL Diesel Concentrate provides the following benefits:

  • Improves Fuel Economy and Restores Horsepower
  • Lubricates Fuel Pump and Injectors: ULSD has significantly reduced lubricity – a critical property in controlling wear in fuel pumps and injectors. AMSOIL Diesel Concentrate adds back in all the lubricity properties needed and more.
  • Reduces Cylinder wear. Retains Engine Oil TBN Longer
  • Minimizes Soot Loading
  • Stabilizes Fuel
  • Improves Water Tolerance

Use one ounce of AMSOIL Diesel Concentrate to five gallons of fuel.

High fuel prices are increasing operating costs for everyone. AMSOIL Diesel Concentrate has proven in industry standard tests to improve fuel economy in used diesel engines by up to five percent. At $3.00 per gallon for diesel fuel, even a modest three percent improvement in fuel economy equals a savings of $0.09 per gallon. With a treat rate of one oz. of AMSOIL Diesel Concentrate to five gallons of fuel, at U.S. Preferred Customer/Dealer prices the net treat cost of AMSOIL ADF is $0.06 per gallon, bringing the total savings to $0.03 per gallon and negating the cost of AMSOIL Diesel Concentrate altogether.

AMSOIL Diesel Cold Flow Improver

Combining AMSOIL Diesel Concentrate with a cold flow improvement property is not cost effective in the summer months, or to AMSOIL customers who live in the south. To keep costs down for Dealers and customers, AMSOIL Diesel Concentrate no longer includes a cold flow improver. Instead, AMSOIL provides new AMSOIL Diesel Cold Flow Improver (DFF) for low-temperature applications below 40°F. Recommended mix ratio is one ounce of additive per five gallons of fuel. AMSOIL Cetane Boost will raise cetane levels up to 7 points for improved performance and fuel economy.

This should get you started. Do not become overwhelmed by all there is to do. Just do a little bit at a time and eventually you will have everything converted over. Once you do, you will have a better performing and protected truck. Please contact me if you have any questions. I am here to assist you in using the very best AMSOIL Synthetic Lubricants and Filtration Systems for your vehicle.


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