The 6.0L Powerstroke (built by International) is one of Ford's most controversial diesels. Head bolt stretch, EGR cooler failure, oil cooler clogging, and FICM failure plague every truck. A properly "bulletproofed" 6.0L is fantastic - an unaddressed one is a money pit.
Plan on $4,000-$8,000 to bulletproof a 6.0L (studs, oil cooler, EGR cooler, FICM, blue spring) if it hasn't been done. After that, the engine is one of the best.
The undersized head bolts stretch under boost, lifting the heads and blowing the gaskets. ARP head studs ($600 + labor) is the permanent fix during head gasket replacement.
Get a free diagnosis →The factory oil cooler clogs with casting sand and debris, restricting EGR cooler coolant flow and starving oil cooling. Replace with updated cooler or external cooler conversion.
Get a free diagnosis →Square-tube EGR coolers crack and dump coolant into the intake. Round-tube upgrade or full delete (off-highway only) is standard. Always replace oil cooler with EGR cooler.
Get a free diagnosis →The FICM steps 12V up to 48V to fire HEUI injectors. Capacitors degrade and the module fails - hard starts and dead misfires. Replacement or repair is $400-$1,000.
Get a free diagnosis →HEUI injector spool valves stick from carbon and varnish. Symptoms: misfire on cold start that clears with warm-up. Hot Shot's Stiction Eliminator helps, replacement is permanent.
Get a free diagnosis →The Snap-To-Connect fitting on the HPOP leaks oil pressure, causing hard hot starts. Updated bolt-on fitting from Ford fixes it permanently.
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Ford TSB 06-26-10 covers head gasket replacement procedures. TSB 07-23-13 addresses STC fitting updates. TSB 08-21-7 covers improved EGR cooler design. Ford extended HPOP and FICM warranty on various 2003-2007 trucks through Customer Satisfaction Program 06B05. Many of these trucks are out of warranty - check before paying out of pocket.
If you see a check engine light, these codes most often relate to the issues above. Click any code for full diagnosis steps.
Yes if it has been properly bulletproofed (head studs, oil cooler, EGR cooler, FICM). A bulletproofed 6.0L is one of the best diesels Ford ever built.
Replacing all known weak points: ARP head studs, updated oil cooler, EGR cooler (or delete off-highway), FICM upgrade, blue spring fuel pressure regulator, and STC fitting.
$4,000-$8,000 if done all at once. $2,500 minimum if just doing head studs, oil cooler, and EGR cooler.
2006-2007 trucks received the most factory updates and are the best starting point. 2003-2004 trucks had the most issues.
Cummins conversions are popular but expensive ($10,000-$20,000). Bulletproofing the 6.0L is far cheaper and yields excellent results.
300,000+ miles with proper maintenance. The block and rotating assembly are stout - the auxiliary systems are what kill stock trucks.