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Old 04-10-2012, 09:07 AM   #29
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Quote:
Originally Posted by w6pea View Post
If you have the V-10 motor, Yes by all means put either Semi-Synthetic in it. I use 5-30w Motorcraft. Do not interchange oil in it.
In other words add Dino Oil to Semi-Synthetic I got that from The Ford Dealership that services my RV. Either run Semi-Synthetic or Synthetic in it. If you choose to use non-synthetic it will not hurt it. But you need to remember do not intermix them.

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Unless I misunderstood what I read on an oil evaluation site a few years ago, semi-synthetic oil is a mixture of dino oil and a percentage of synthetic oil. I have mixed semi-synthetic and dino oils for years without a problem.
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Old 04-10-2012, 09:25 AM   #30
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Nathan, you are correct. I don't like the term "semi-synthetic" because it implies half conventional and half synthetic. The "synthetic blends" can have as little as 10% synthetic and thus offers no real advantage. Many are leaving the market place.

All oils that are rated with the same API category, such as API SN or API CJ4, have to be mixable (conventional and/or synthetic) and usable within that specific API category by law.
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Old 04-01-2018, 02:35 PM   #31
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V10 Viscosity - check the Bible.

CHECK THE BIBLE - the owner's Manual, for the oil viscosity. The newer ones say 5-20 but that is not the case for all V10s. The older ones are 5-30.
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Old 04-01-2018, 06:43 PM   #32
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I keep reading 5-20 oil. My oil fill cap reads 5-30. Not sure what the book says. I have been using 5-30 since I purchased it new. Changed the oil at 2200, 5500, and 11000 miles with mobil one filters and mobil one full synthetic. 5-20 seems a bit thin. I guess I will have to read the ford manual. I have the 2 valve heads 305 hp v10.
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Old 04-01-2018, 07:30 PM   #33
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Ohhh, noooooo . . . . The dreaded oil thread!!! Run way, run away!!!!

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Old 04-01-2018, 07:39 PM   #34
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CHECK THE BIBLE - the owner's Manual, for the oil viscosity. The newer ones say 5-20 but that is not the case for all V10s. The older ones are 5-30.
You've resurrected a six year old thread!
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Old 04-02-2018, 07:31 AM   #35
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You've resurrected a six year old thread!
Info still good and people are interested.
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Old 04-12-2018, 04:34 PM   #36
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Mobil 1 5w20
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Old 04-12-2018, 09:33 PM   #37
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Whatever the cap indicates, run that viscosity AND motorcraft filter nothing else!
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