Question about 2004 Mercury Grand Marquis
While it is always best to go with the manufacturers specification in my opinion the 5w30 will still work just fine.
The 30 weight is designed to stay thicker at higher temperatures.
But some manufacturers are concerned about the additives that it takes to make it work that way.
They say the additives have the potential to cause harm over time.
But in my opinion this would be more prevalent in an oil with a wider range. For example a 0w40 or a 10w50.
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Posted on Oct 15, 2010
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Posted on Jan 02, 2017
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