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Message: [QUOTE="Mhatlen, post: 1520174, member: 14173"] What.....? The Synthetic oils 5W/40 don’t shear anything even close to 15W/40 natural oils that were spec’d for the 6.0 from conception. The entire engine benefits from the synthetic oils signuficantly. The injectors likely benefit the most from the 5W/40 since HEUI uses extremely precise injectors with fine oiling galleries and spool valves that excel with the lighter oils. Only one reason Ford didn’t spec a 5W/40 oil............it didn’t exist in 2003. Fellas oil has made the biggest advances ever over the last 20 years and last 10 have been the biggest advances. Do some research on how oils have advanced and eliminated ash and acidic characteristics and all the flaws that came with natural oils when ran in engines. [/QUOTE]

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