Was this a big mistake from Ford?

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VirginiaR

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Well, talking about Ford engines, when Ford introduced Zetec engines back in the late nineties in Southamerica, they recommended the same oil viscosity of the old Endura -15W 40-, even though both engines differ greatly in every aspect... What could happen to a Zetec engine if it gets 15W-40 oil, instead of 5W-30, considering that in some regions summer's temperatures normally climb well over 35° C... or maybe Ford did the right thing?
Thank you all guys for your opinions.
 
i think ford would measure bearing tolerances and decide on viscosity to create protective barrier between surfaces
 
oil viscosity rating have a lot more to do with climate than with the engine that they are in. The location has a lot to do with the climate. Now... most of today's modern oils have a LARGE range of operable temperature range. For instance, I believe the 5W30 that I use in most of my cars is good to -35 and up to 125.
 
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