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Old 07-22-2019, 08:04 PM   #1
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V10 oil change

We have a 2002 motor home with a 10 and have been using 5W-20 when changing oil. But the other day a guy was telling me that I should be using 5W-30 even if the book call for 5W-20. Need to change oil soon and now not sure what to use.
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Old 07-22-2019, 08:47 PM   #2
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After logging 10k miles on our 2000 coach I switched over to Mobil 1 full synthetic 10w/30 and been using it ever since. Now have 91k miles on our coach with no issues.

Good luck with your choice and safe travels.....
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Old 07-22-2019, 08:54 PM   #3
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I believe the manufacturers switched to 5w-20 because it will give you better mileage. How much better? Who knows? I switched to 5w-30 in our Ď07, but really, if everything is working fine, 5w-20 wonít hurt a thing. Others with more mechanical knowledge than me will chime in Iím sure.
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Old 07-23-2019, 06:30 AM   #4
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I run 5w30 in mine.. My choices are 10w30, 5w30 or 5w20

If most of my usage was in the north in the cold winter, I'd use 5w20. (thinner). If I was operating in the south during the hot summer, I'd use 10w30. (thicker).

The majority of my operations are in the southwest in the winter so I use a middle of the temperature range, 5w30.

Would it hurt anything to use any of these three, I doubt it. Change oil and filter every 5k miles and you should be good.
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Old 07-23-2019, 06:53 AM   #5
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I use use 10 w 40 Mobil 1 fully synthetic past several years because we live in hot climate
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Old 07-23-2019, 08:59 AM   #6
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Originally Posted by LGMurphy View Post
We have a 2002 motor home with a 10 and have been using 5W-20 when changing oil. But the other day a guy was telling me that I should be using 5W-30 even if the book call for 5W-20. Need to change oil soon and now not sure what to use.
Either oil will protect your engine. They are both the same weight oil. Both are 5 wt. The difference is the additives. 5W20 is a 5 wt oil that has additives (viscosity enhansers) that protect like a 20 wt oil. 5W30 has additives that protect like a 30 wt oil. But both are the same 5 wt oil. Sometimes manufacturers don't like certain additivies. Ford and GM both used to advise against using 10W40 oil. There was something in the viscosity enhansers they did not like. That is why 10W40 oil is getting harder to find. It is still available because there is a market for it. Ford may have discovered something in the 5W30 oil they did not like. They used to call for 5W30 but now reccommend 5W20. I would go with the owners manual.
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Old 07-23-2019, 09:06 AM   #7
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Personally I like to do what the mfg says. It's been a while since I read the manual on mine, but as I recall there were three choices of oil and they were based on average temps where you live/drive.
Seems to me you can't really go wrong by going by the book, as opposed to what you heard or read on the internet. But maybe that's just me.
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Old 07-23-2019, 02:45 PM   #8
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The Ford manual says: "To protect your engine and engineís warranty, use Motorcraft SAE 5W-20 or an equivalent SAE 5W-20 oil meeting Ford specification WSS-M2C930-A." The filler cap on my engine says " Use 5W20."
I use Motocraft 5W20 as I hope Ford would sell you the right oil to use in their engines. I use the Motocraft filters for the same reason. This is my second coach with the V10 engine and I've never had a problem. Oil stays full from change to change.
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Old 07-24-2019, 10:10 AM   #9
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Originally Posted by LGMurphy View Post
We have a 2002 motor home with a 10 and have been using 5W-20 when changing oil. But the other day a guy was telling me that I should be using 5W-30 even if the book call for 5W-20. Need to change oil soon and now not sure what to use.
The original printed manual that came with our 2001 motorhome built on the F53 chassis specified 5W-30 oil. The original online manual also specified 5W-30. The current online manual for the same year chassis labeled as "Reprint 1" specifies 5W-20 oil.

We had our 2001 motorhome about 2 years when we got a certified letter from Ford. The letter contained information about increasing the minimum tire pressure from 70 psi to 75 psi, and changing the oil specification from 5W-30 to 5W-20.

The manual for our current 2013 motorhome chassis recommends 5W-20 oil.
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Old 07-24-2019, 11:38 AM   #10
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Stick with 5-20

I talked to an ex-ford mechanic who said he rebuilt V-10 engines that had camshaft failures from using oil that was too thick. He said the oil galleries going into the camshaft journals were very tiny, and anything thicker than 5-20 reduces oil flow, and worst case takes out your camshaft journals...
As always, you decide
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Old 07-24-2019, 02:04 PM   #11
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I talked to an ex-ford mechanic who said he rebuilt V-10 engines that had camshaft failures from using oil that was too thick. He said the oil galleries going into the camshaft journals were very tiny, and anything thicker than 5-20 reduces oil flow, and worst case takes out your camshaft journals...
As always, you decide
More than likely, they failed due to the oil being too light and not being pumped up to the cam journals. I changed to 10-30 wt because I was having cam rattle at 4,000 RPM on hot days. If we were in below freezing weather 24/7/365, I would go back to 5-20, but it is really not heavy enough for the duty that the MH engines see. Remember, Ford states to use 5-20 for corporate mileage ratings. They know their engines will go the warrantee period with no problems (they hope). Like you said, you decide.
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Old 07-26-2019, 03:17 PM   #12
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I also only use FULL SYN. MOBILE ONE
I agree if your going to travel in HOT CLIMATES then use 10w-30 full syn..
All other climates I use 5W-20
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Old 10-01-2019, 04:18 PM   #13
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This is what my oil cap says

... so I use Mobil 1, 5-w/30.
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Old 10-01-2019, 05:29 PM   #14
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Oh gosh, how long is this post going to run.... IMO use what is written on the oil filler cap, or in the manual. Change it at the designated interval (+/- a few miles)
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