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Old 07-09-2013, 07:12 PM   #21
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95% of engine wear occurs at start-up. Low viscosity (5W20 for the Dtec) oils are much better at getting lubrication to the critical areas during cold starts. Low viscosity synthetic oils and blends do not break down at higher temps like low viscosity conventional oils.

Your engine was designed to run on Motorcraft Synthetic Blend. I put 160K on a Dtec with the MC oil and 5K oil changes with absolutely no problems. The synthetic blends are a little cheaper than the full syn but if you want to run longer oil changes I would go to the full syn.
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Old 07-09-2013, 07:44 PM   #22
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I buy what ever full syn oil is on sale then run it for 10,000 miles. With a filter change and and a oil top up at 6000 miles.
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Old 07-09-2013, 08:23 PM   #23
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Ford recommends 7500Mile OCI for my 2011 Focus using oil that meets a certain spec. There are numerous conventional oils that meet the spec, along with numerous synthetics.

Ford's Motorcraft oil is a really good synthetic blend and can be had for a great price.
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Old 07-09-2013, 08:32 PM   #24
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'Low viscosity (5W20 for the Dtec) oils are much better at getting lubrication to the critical areas during cold starts.'

So they would have you believe. One should consider that the thicker oil will not drop back out of passages as fast as the thinner one will, or capillary action, which works better with thicker oil. If the oil is still in the critical area then no need to get it there faster.

Biggest problem I've personally seen is start up rattle using thinner oils, I have cured problems like that by going to a thicker oil. Try explaining that one away..........

'Reactive maintenance methods are seldom wise for complex equipment, systems or living beings.'

Could not more heartily disagree. 'Reactive' thinking often cures so many problems one cannot count. ALL vehicle recall actions are reactive, as well as any action taken by a manufacturer to cure perceived problems in the field. Any modification to a factory service manual based on real world previous result would be reactive as well. Are we saying here those actions are bad?

Reactive thinking can be strong evidence of thinking in the best interest of oneself. The alternative is simply falling into the ranks with the rest of the lemmings. Or, controlled thought. Sorry, you can have my portion of that.
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