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Old 06-04-2016, 10:59 AM   #1
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Full Synthetic Oil ??

I have a Sunseeker 3010DS on a 2014 Ford E450 chassis with 2,700 miles on the odometer. On my last oil change I had 5W-20 full synthetic put in instead of the semi-synthetic blend. When I brought the motorhome into a Ford dealer because the check engine light was on, I mentioned to the service manager that I recently had the oil changed and went with full synthetic. He said I should not have done that because the 6.8 V10 will burn a quart of full synthetic every 1,000 miles as blowby and that once you put full synthetic in the engine you can never go back to the semi synthetic blend. I have never heard of that before and the Ford manual recommends either the semi synthetic blend or full synthetic. Has anyone else started using full synthetic and did you have any problems with the engine after you started using it ?
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Old 06-04-2016, 11:07 AM   #2
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Never had a Ford, but switched to Mobil 1 on a new 1978 Chevy Heavy Half and have switched every vehicle we've owned to Mobil 1 every since. No problems.
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Old 06-04-2016, 11:33 AM   #3
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Originally Posted by lucky55616 View Post
I have a Sunseeker 3010DS on a 2014 Ford E450 chassis with 2,700 miles on the odometer. On my last oil change I had 5W-20 full synthetic put in instead of the semi-synthetic blend. When I brought the motorhome into a Ford dealer because the check engine light was on, I mentioned to the service manager that I recently had the oil changed and went with full synthetic. He said I should not have done that because the 6.8 V10 will burn a quart of full synthetic every 1,000 miles as blowby and that once you put full synthetic in the engine you can never go back to the semi synthetic blend. I have never heard of that before and the Ford manual recommends either the semi synthetic blend or full synthetic. Has anyone else started using full synthetic and did you have any problems with the engine after you started using it ?
Horse poo, X2!!!
Have been using full synthetic in everything I own, or have owned, for the last 30 years. From my Lexi to my lawnmower, motorcycles to the genny in my Lexi...full synthetic. Also use synthetic gear oil in the rear end of the Lexi, our two Subaru's, and synthetic in my Subi XV manual tranny.
Never had a single problem with "blowby" or "burning" any syn oil at all.
Your service mgr. is living in the 80's. Just ask him what comes in Mustangs, Vette's, ect, as standard and it's what's required in many vehicles by the manufacturer.

Put your mind at rest and use what you want too, including synthetic.
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Old 06-04-2016, 11:47 AM   #4
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If an engine is worn...ring wear..it will use more synthetic because it is slippery. As per Schaeffers rep. Good engine normally no issues. I could not understand never go to semi or full synthetic. Just pick one you like and stay with it as long as it meets or exceeds OEM specs you are good. The maintenance manual for the vehicle/machinery takes all the bull out of people's opinion.


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Old 06-04-2016, 11:56 AM   #5
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Find another Dealer,that one is "Living in the Past"! Youroo!!
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Old 06-04-2016, 12:04 PM   #6
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I have a 2011 sunseeker 3170 same engine as you bought it used with 30,000 miles previous owner used standard oil in it. I switched it to full synthetic and now have 59,000 miles on it and haven't used a drop of oil between changes yet.
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Old 06-04-2016, 01:03 PM   #7
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Originally Posted by lucky55616 View Post
I have a Sunseeker 3010DS on a 2014 Ford E450 chassis with 2,700 miles on the odometer. On my last oil change I had 5W-20 full synthetic put in instead of the semi-synthetic blend. When I brought the motorhome into a Ford dealer because the check engine light was on, I mentioned to the service manager that I recently had the oil changed and went with full synthetic. He said I should not have done that because the 6.8 V10 will burn a quart of full synthetic every 1,000 miles as blowby and that once you put full synthetic in the engine you can never go back to the semi synthetic blend. I have never heard of that before and the Ford manual recommends either the semi synthetic blend or full synthetic. Has anyone else started using full synthetic and did you have any problems with the engine after you started using it ?
He's full of crap and he's full of crap.

First, older engines needed to be fully broken in (rings seated and worn in) before switching to synthetic because synthetic is so slick the rings would never wear in.

Today, with modern rings and machining techniques they leave the factory on syn or semi-syn and never burn a drop. So there, you're fine.

Second, I have no clue where that rumor started but you can swap back and forth at will and the engine won't care, you just lose the benefits of synthetic oil. You'll also hear that if you're stuck and you have to pour a quart of conventional oil in your engine will seize up and explode. Nope, what do you think a synthetic blend is made of? Again, you are simply diluting the synthetic benefits down, that's all.
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Old 06-05-2016, 12:35 PM   #8
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The guy at the Ford dealer is full of it. If you were going to burn oil the way he said then you would burn half a quart of the mixed blend. The engine light may have come on because of a bad sensor or some other reason, half synthetic or full synthetic is not going to do diddly.
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Old 06-05-2016, 12:42 PM   #9
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I agree with the others. We just completed a 5,500 mile trip in our 2011 Sunseeker with the Ford V10. It used less than one pint of oil. I have always used NAPA 5W20 full synthetic (claimed to be manufactured by Valveoline).
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Old 06-05-2016, 12:50 PM   #10
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yes i think he's full of it all so . i think if you wanted to switch back you can .
i use a semi synthetic in my truck . now my motor cycle is a different horse . with full synthetic it will use some up but not with dino so i stick with Dino in the bike
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