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Old 11-17-2019, 08:10 PM   #1
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Preferred oil type for 6.8L V10 E350

Does anyone have a preferred type of oil they use in these V10 E350's?



I think someone said they like valvoline maxlife 5W-20. Do people do full synthetic? Any preference for the high mileage vs non? I have 135k miles on my engine.


Was trying to just use search function on here but didn's see any clear results on this, so figured just post up a quick thread on it.



Thanks!
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Old 11-17-2019, 09:53 PM   #2
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5w20 works well for the V10. I switched to synthetic around 150,000 miles for two reasons:

-I was driving so much, doing an oil change every 5k was a PITA. 10-15k is just way more convenient, and synthetic tolerates these longer oil changes just fine.

-I was seeing the occasional puff of oil smoke on cold starts, meaning the valve seals were leaking. On a hunch I tried synthetic, and after about 10,000 miles it went away completely and never came back.

If you tow heavy in hot weather, a heavier oil like 5w30 can reduce oil consumption. If you aren't towing heavy or don't spend a lot of time in the desert SW, 5w-20 is fine.

But avoid the temptation to use a heavier "w-wight", such as 10w-30, as most wear happens during cold starts, and the Triton motors have some very tight passages and the heavier-when-cold oils just aren't good for these motors.
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Old 11-17-2019, 09:56 PM   #3
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I too have always used 5w20, full synthetic. Mostly have used Mobil 1, but last oil change tried Amsoil. I think the shop said could go up to 10k or 15k miles. Only have 2k miles on this last oil change.

Do you guys think that you need to change it after 1 year, even with low miles on it?
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Old 11-17-2019, 10:01 PM   #4
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Quote:
Originally Posted by cellularSTEVE View Post
Do you guys think that you need to change it after 1 year, even with low miles on it?

Thanks for the reply - that is a good question about the 1 year timeframe, I was wondering the same thing because I'm approaching that 1 year mark and am not at that many miles.



FWIW - with my motorcycle I do change out around the 12 month mark even if I haven't hit the mileage mark. I'll probably do the same with the van unless there's a consensus on here that age of oil doesn't matter as much as mileage.
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Old 11-17-2019, 10:07 PM   #5
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On the 1 year thing... I would always recommend that to my shop customers, but that was because my low-mile customers never left town (Corvallis is only about 4 square miles), so they were getting tons of cold-starts still.

If your rig has not been getting miles because it's been parked, I wouldn't worry about it.
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Old 11-17-2019, 10:13 PM   #6
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-I was seeing the occasional puff of oil smoke on cold starts, meaning the valve seals were leaking. On a hunch I tried synthetic, and after about 10,000 miles it went away completely and never came back.

If you tow heavy in hot weather, a heavier oil like 5w30 can reduce oil consumption. If you aren't towing heavy or don't spend a lot of time in the desert SW, 5w-20 is fine.

That's good to know - I've actually been noticing a white puff of oil smoke on starts recently (now that winter just hit). I should probably just go full synthetic for this next change.
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Old 11-24-2019, 01:49 PM   #7
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I have used Mobil 1 5-20 full synthetic since mile one and have tried to change it every 5,000 miles. Now at 165,000 miles and it still seem pretty tight. I think I may have lost .5 mpg over time, but it's hard to know for sure. Seems like each trip the van gets a little heavier as we add stuff and don't take anything out. I think we are 300 to 400 pounds heavier than when we first started using it.
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Old 11-24-2019, 02:01 PM   #8
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I also have a F150 with the 3.5 Ecoboost which requires 5W30 oil. Because of that - and because I also live in the desert - I use the 5W30 in both the F150 and the E350 with the 6.8.
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Old 11-24-2019, 11:31 PM   #9
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We do tow a 29' 1976 Airstream at least 10K miles a year. I had been using the Ford 5-20 blend. Several years ago I began using Shell 5-20 and Pennzoil 5-20. The non synthetic oils did burn when I was towing especially when it is hot. About 1qt per 1000 miles. I switched back to the Ford 5-20 blend and, at 300,000 miles, I may add a quart after 2000miles if we are doing a lot of mountain roads in the summer. Otherwise it burns very little of the Ford blend.
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Old 11-25-2019, 10:58 AM   #10
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I use Mobil 1 in all of my vehicles. Seems a small price to pay for peace of mind. 5W-20 per Ford's spec.
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