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Old 04-10-2012, 10:07 AM   #29
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Patrol 65's Avatar
Join Date: Oct 2011
Location: Charleston, SC
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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.

Good Luck

If We Can't Haul It....You Don't Need It! Motor-T
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.

Nathan and Linda, 2000 Winnebago Chieftain 35U, F53 Chassis, Banks Power Pack
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Old 04-10-2012, 10:25 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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