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Old 12-03-2011, 10:50 AM   #7
FuriousFocus
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Location: Kent, OH
What I Drive: 02 Zetec 5speed

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Honestly, for me, I think its more a fear of the unknown running 10W40 in my Zetec vs what Ford says I should run. I've been running 5W30 in my Zetec for 5 years - car has 81,000 on it and will be ten years old in April with the original oil and water pump. I would not run 40Wt in my motor because I don't see a need for it when Ford says 20Wt is best. If I was racing the car I would use a higher WT oil, probably 40Wt, to keep the oil from being too thin at constant high temps.

PS, Tom your base tune really woke up my car, thanks again.
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