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Old 09-28-2018, 02:30 PM   #1
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Which Oil Weight?

Ok, it was time to change the oil in my 2016 Sunstar LX, first time for me since I owned it. So I looked up the recommended oils in the Ford Manual and they the top four listed say 5W-20W. So that's what I bought, Castrol GTX 5W-20 Full Synthetic. After draining the old oil, and getting ready to pour in the new, I see on the oil fill cap that it says 5W-30W! What's going on? Should I drain the new oil I just put in and put in the 5W-30W? I live in the mountains east of San Diego and we do get some snow up here but most of our trips are during non winter months. Just getting ready for a trip from Home to Flagstaff for a week or two and wondering if I've made a mistake.
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Old 09-28-2018, 04:10 PM   #2
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Looking back at the manual, there's a little tiny footnote number above the part number. Going to the next page, down at the bottom, it says "1Reference the reservoir cap for proper fluid." Wish I'd seen that before I bought the oil.
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Old 09-29-2018, 07:11 AM   #3
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Is there really an engine oil reservoir cap on that motor home as I only see an oil fill and dipstick? Since the V10 was introduced its been 5W-20 as the standard oil however 5W-30 has been an option on the newer ones.


Call the toll free Ford Customer Hotline and ask them before going too insane over this.
1-800-392-3673
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Old 09-29-2018, 09:33 AM   #4
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On my 2015 178" Wheelbase 18K GVWR F53 chassis with the 3V 6.8L V10, it was 5W20, and that can be either a synthetic blend or full synthetic oil. FL-820-S for oil filter.

However some other applications of the same engine in 2015 such as the F59 chassis specified 5W30. What's the difference?

Both are about the same weight (5W) when the engine is cold. 5W20 is thinner at engine operating temperature than 5W30. Thicker engine operating temperature oils can reduce wear of certain components under extended highway use. Thinner oils deliver better MPG.

You are fine running either for a 5,000 mile interval between oil changes, but I would use a full synthetic version of what Ford recommends for future oil changes.
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Old 09-29-2018, 02:35 PM   #5
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Well, I've decided to leave in the 5W20. Did some research and got lots of opinions from people that said it would be fine. I was curious and downloaded the 2017 F53 manual, and guess what, 5W-30 is not even listed, only 5W-20. I seriously doubt there were any serious engine changes between the 2016 and 2017 so I think I'm safe. Thanks for the input everyone.
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Old 09-30-2018, 04:21 AM   #6
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I have a 2016 Vista 26he which should have the same Ford F53 chassis and V10 motor and mine calls for 5w-20 synthetic blend in the USA and full synthetic in Canada. I'm in Michigan and use full synthetic 5w-20.
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Old 10-03-2018, 05:09 PM   #7
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I have your same ford V10 motor. I have had two of them, One said to use 5wX30W and the newer one says use 5wX20W. I have used both weights on the engines and found no difference. Often of recent years, the manufactures have been held accountable for new gas mileage standards. One supposed method of getting a 1/2 ounce of better mileage is to recommend a lower oil weight. I suspect that may be what's happening in your case.
I went with 5WX20W Amsoil synthetic oil with a 10K mile filter. Now I change it once a year and forget it. I used two use the 25K Amsoil mile oil filter but Why? I change it once a year anyway; so now I use a 10K oil filter.
You will have no problems with either the 20 or 30 weight number. Get the 10K oil filter because it is slightly larger than stock and will help cool the oil better in places such as Death Valley, climbing mountain passes and etc.
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Old 10-03-2018, 05:29 PM   #8
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The W stands for Winter. The 5 means the oil is fine below freezing and the 20 means it's good for high temps. Since we're heading into winter, you're probably good now for both ends of the temp spectrum until next year.


"Your engine needs oil that is thin enough for cold starts, and thick enough when the engine is hot. Since oil gets thinner when heated, and thicker when cooled, most of us use what are called multi-grade, or multi-viscosity oils."


I quickly looked for a chart showing the temp extremes but none that I found show the 5W-20, but this will give an idea, note that the temps are Centigrade: https://www.google.com/search?q=oil+...Z2eJU_cB4gO7M:


There's really not much, if any, difference in engine performance or length of usable life using 5W-20 or 5W-30 so really nothing to worry about.
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Old 10-04-2018, 12:03 PM   #9
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Hard to beat Mobil 1 in any weight. Works great in our Itasca, Built in 2006, 42000 miles.
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Old 10-04-2018, 12:57 PM   #10
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Quote:
Originally Posted by gpScotty View Post
Hard to beat Mobil 1 in any weight. Works great in our Itasca, Built in 2006, 42000 miles.

That's true, I used it for a couple decades but then they act like their name on the bottle is worth a couple more $$ per quart just for bragging rights. I feel that any fully synthetic is good if it's approved and I like saving money, so I've used off name brands for another couple decades.


The difference between 20 & 30 though is so minor, really shouldn't be a concern to the OP I don't think.
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Old 10-04-2018, 06:37 PM   #11
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I have found the best price at Wal Mart.I bring my own oil, buy the filter from dealer and the cost of them doing it. Past the days of my doing it. gps
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Old 10-04-2018, 07:05 PM   #12
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Problem with WM brand oil is that a few years ago they spend many millions trying to get congress to give them permission to call 'Synthetic Blend' something else...and that something else was 'Full Synthetic'. They had no science to back up their reasoning, they just wanted to make money by scamming their customers. And they paid the bribes as you'd expect. To no avail. Back then it was rejected. However, who knows now?

Because of that, I kind of hesitate to buy Synthetic oil at WM because I don't know for sure they didn't squeeze that ploy of theirs in as a rider on some other bill over the years since.
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Old 10-04-2018, 11:49 PM   #13
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Quote:
Originally Posted by gpScotty View Post
I have found the best price at Wal Mart.I bring my own oil, buy the filter from dealer and the cost of them doing it. Past the days of my doing it. gps
I've found WalMart to be a good and reasonably priced source for the Motorcraft 5W20 blend that my E450 calls for.
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Old 10-29-2018, 03:40 PM   #14
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What weight of oil to use in my 14 view sprinter with mercedes 3.0 diesel? One sticker calls for mercedes oil the other one says mobil 1.
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