2000 Cobra R oil

2003cobra22

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I was looking at a 2000 Cobra R and noticed it recommended 15W-50 weight oil and thought wow! Why did the NA 5.4 4v need such a thick oil?
 

SID297

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Because that particular engine was designed for HPDE and road racing. The 15w50 oil spec is based on that expected usage.
 

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