Originally Posted by w6pea
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.
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