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Old 09-26-2021, 06:26 PM   #1
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Type Gas for Ford E350 Engine

2016 Coachman Class C w/Ford E350 engine. Heading for my first fill-up tomorrow. Coach came with no engine paperwork. Around the fill neck it says to use only unleaded fuel. What octane are we talking about? Back in the day you only had two choices, regular at $.35 per gallon or ethyl at $.41 per gallon?
Thanks.
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Old 09-26-2021, 06:38 PM   #2
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Quote:
Originally Posted by rmason44 View Post
Back in the day you only had two choices, regular at $.35 per gallon or ethyl at $.41 per gallon?
Thanks.
Ok , now your showing your age .

I remember the day Premium fuel went to $0.50 gal. the Caddy and Olds owners looked at us like we'd put a gun to their head.

Enough , back to the question at hand , I'm pretty sure the V-10 Ford is tuned for 87 octane .
Owners manual for the engine should be available as a pdf from Ford.
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Old 09-26-2021, 06:47 PM   #3
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Quote:
Originally Posted by rmason44 View Post
2016 Coachman Class C w/Ford E350 engine. Heading for my first fill-up tomorrow. Coach came with no engine paperwork. Around the fill neck it says to use only unleaded fuel. What octane are we talking about? Back in the day you only had two choices, regular at $.35 per gallon or ethyl at $.41 per gallon?
Thanks.
You’re good to go with a source that provides good fresh regular unleaded 87 octane.
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Old 09-27-2021, 12:08 AM   #4
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Quote:
Originally Posted by rmason44 View Post
2016 Coachman Class C w/Ford E350 engine. Heading for my first fill-up tomorrow. Coach came with no engine paperwork. Around the fill neck it says to use only unleaded fuel. What octane are we talking about? Back in the day you only had two choices, regular at $.35 per gallon or ethyl at $.41 per gallon?
Thanks.
Search online and DOWNLOAD the chassis Owner's Manual for the your (2015?/ 2016? by Year/VIN, answer can vary); my 99 chassis/engine (2000 FLOORPLAN) says 87-octane only, (and experience says same, just NO LOWER than 87) but some year's manual says increase octane when needed/if needed, which can vary by load, altitude/ season/gas brand, etc. luck TO YA
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Old 09-27-2021, 01:32 AM   #5
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CLICK HERE to download your owners manual. Have your VIN number handy and enter that to assure you get the right manual.

For our 2007 E350-V10 the manual states to use 87 octane. At high altitude where the air is thinner, 85 octane is sold as "regular" so I use that there. I don't know if the newer model years are any different, for example if E85 can be used. You don't want to use a higher octane than specified to avoid excessive carbon build-up on the valves over time.
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Old 09-27-2021, 05:52 AM   #6
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just good fresh regular gas from a busy station is best.. lowest ethanol is best IMO..
My older 460 E350 has timing bumped and exhaust work, It like good regular fuel.. I can tell an off tank, as MPG drops and i get a rattle, ping..
Same for a V10 if it has atune.
Stocvk OEM, just fresh good fuel 87-89 is best, no advantage for prem..
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Old 09-27-2021, 08:15 AM   #7
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87 Octane for Ford V10

I have a 2019 e450 chassis with the same V10 engine. I have put 10K miles on my RV experimenting with the three typical grades you find at the pump. I have found no significant difference in fuel economy or engine ping with 87 or greater octane other than price!
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Old 09-27-2021, 10:47 PM   #8
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Quote:
Originally Posted by rmason44 View Post
2016 Coachman Class C w/Ford E350 engine. Heading for my first fill-up tomorrow. Coach came with no engine paperwork. Around the fill neck it says to use only unleaded fuel. What octane are we talking about? Back in the day you only had two choices, regular at $.35 per gallon or ethyl at $.41 per gallon?
Thanks.

We have a 2000 Tioga 24D with the V10 .

I installed the 5 Star Tune , which is set up for 87 octane . Better all around performance with more power and better shift points .

No need for higher octane to improve performance.
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