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#4447244 - 07/02/17 09:03 AM Shorten OCI w/ ethanol usage? 2014 GM L83 5.3
04SE Offline


Registered: 05/04/07
Posts: 914
Loc: IL
My 2014 Chevrolet Silverado has the 5.3 L83 engine and I use E85 exclusively. I am almost 2,000 miles into my OCI and the OLM is tracking precisely towards the 7,500 mile OCI that GM recommends.

Ford calls for a severe service OCI when using E85 (according to my previous 2009 FX4). GM doesn't even mention a shortened OCI (for any reason) anywhere that I have found yet for this engine. I thought that GM might have the PCM programmed to shorten the OCI with E85 usage and other factors but she is on track to hit 7,500 miles almost exactly at 0%.

I am running Mobil 1 EP 0w20 w/ Wix 57045 and am planning on an OCI at 3,000 just to see if the E85 is chewing up the oil and see if I have any dilution due to the direct injection.

Thoughts?
_________________________
Life's little problems can be solved with a shovel and silence.

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#4447295 - 07/02/17 10:15 AM Re: Shorten OCI w/ ethanol usage? 2014 GM L83 5.3 [Re: 04SE]
SilverFusion2010 Offline


Registered: 06/29/11
Posts: 1657
Loc: Crawfordville FL
My ford manual states severe service oci when running e85. The only way you'll know for sure is to UOA
_________________________
2010 Ford Fusion SE 3.0L V6, 178k miles M1 HM 10w-30

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#4447300 - 07/02/17 10:19 AM Re: Shorten OCI w/ ethanol usage? 2014 GM L83 5.3 [Re: 04SE]
WyrTwister Offline


Registered: 01/13/13
Posts: 1505
Loc: Texas
Flex Fuel engine ?

How does fuel economy on E85 compare to the E10 common here ?

Thanks , :-)
Wyr
God bless
_________________________
Wyr
God bless

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#4447321 - 07/02/17 10:34 AM Re: Shorten OCI w/ ethanol usage? 2014 GM L83 5.3 [Re: WyrTwister]
SilverFusion2010 Offline


Registered: 06/29/11
Posts: 1657
Loc: Crawfordville FL
Originally Posted By: WyrTwister
Flex Fuel engine ?

How does fuel economy on E85 compare to the E10 common here ?

Thanks , :-)
Wyr
God bless


20/25% less mpg. I just run regular pump gas. I've never found an e85 station to be convenient in terms of location. I few tanks of e85 will clean out a motor though. Carbon go bye bye. Also the motor is supposed to add 10HP on e85. I guess ford programmed it to advance the timing
_________________________
2010 Ford Fusion SE 3.0L V6, 178k miles M1 HM 10w-30

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#4447323 - 07/02/17 10:35 AM Re: Shorten OCI w/ ethanol usage? 2014 GM L83 5.3 [Re: 04SE]
CT8 Offline


Registered: 10/09/14
Posts: 10946
Loc: Idaho
Syn oil seems like a 100% waste with short oil changes.
_________________________
"Don't let your preconceived notions get in the way of facts."
Geoff Metcalf

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#4447342 - 07/02/17 10:58 AM Re: Shorten OCI w/ ethanol usage? 2014 GM L83 5.3 [Re: 04SE]
Astro14 Online   content


Registered: 10/10/10
Posts: 8533
Loc: Virginia Beach
For my Toyota flex-fuel vehicle, the OCI is one half that of the regular fuel vehicles.

For my truck, the OCI is 10,000 miles for a regular engine, it's 5,000 miles for the flex fuel.

The service minder in my Tundra (an FFV) is simply set to 5,000 miles. No real OLM that monitors usage. It simply counts down time and miles. Interestingly, the owner's manual goes on to say that if primarily E85 fuel is used, the oil change interval should be halved, which implies a 2,500 mile OCI...

As far as MPG, arithmetic would tell you that 85% ethanol would get you about a 35% loss in MPG, because of energy density of ethanol versus gasoline.

In practice, it's closer to 20% loss in MPG.

This may be because E85 is anywhere from 50% to 85% ethanol, so the full reduction isn't realized because it's not actually 85% ethanol every time I've filled it. Further, the truck runs better on E85. More responsive, more HP. Not a huge change, but definitely noticeable. So, perhaps I am also using less throttle, which might contribute to efficiency in a very modest way.
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#4447356 - 07/02/17 11:23 AM Re: Shorten OCI w/ ethanol usage? 2014 GM L83 5.3 [Re: 04SE]
slacktide_bitog Offline


Registered: 03/20/08
Posts: 6145
Loc: USA
Your Silverado has an OLM, which will account for the E85 usage smile

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#4447386 - 07/02/17 12:05 PM Re: Shorten OCI w/ ethanol usage? 2014 GM L83 5.3 [Re: 04SE]
04SE Offline


Registered: 05/04/07
Posts: 914
Loc: IL
Originally Posted By: WyrTwister
Flex Fuel engine ?

How does fuel economy on E85 compare to the E10 common here ?

Thanks , :-)
Wyr
God bless


https://bobistheoilguy.com/forums/ubbthr..._oc#Post4392091


Originally Posted By: CT8
Syn oil seems like a 100% waste with short oil changes.


GM only allows for 0w20 in this engine and I have a factory 100,000 mile powertrain warranty to maintain.


Originally Posted By: slacktide_bitog
Your Silverado has an OLM, which will account for the E85 usage smile


That is just it, the OLM hasn't reduced oil life beyond 7,500 miles per OCI. The OLM shows a percentage and when you do the math of miles driven versus percentage used it works out to almost exactly 7,500 miles - as in 7,4XX. It would appear that the OLM is just a counter and not a 'smart' OLM.
_________________________
Life's little problems can be solved with a shovel and silence.

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#4447398 - 07/02/17 12:17 PM Re: Shorten OCI w/ ethanol usage? 2014 GM L83 5.3 [Re: 04SE]
hatt Offline


Registered: 01/03/12
Posts: 4292
Loc: Florida
My 2013 Ford doesn't say anything about a shorter OCI. It does say to run a tank of regular gas each oil change if using e85 exclusively.
_________________________
2013 F150 5.0, PUP 10W-30, Wix 57502
2010 Camry 2.5, GTX 5W-20, Fram Ultra XG9972

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#4447428 - 07/02/17 12:59 PM Re: Shorten OCI w/ ethanol usage? 2014 GM L83 5.3 [Re: 04SE]
Crispysea Offline


Registered: 04/14/17
Posts: 402
Loc: TN USA
My wife has a 2012 Grand Caravan with the 3.6L Pentastar. It goes from 17-18 mpg on E10 to around 14-15 mpg on E85. I have a few E85 stations close by, but the price usually isn't worth it. However, it hit $1.50 last week, so I filled it up. There's definitely more torque and HP. I changed the plugs last month, and the valves were very clean. I'd been using E85 every few tanks.


Edited by Crispysea (07/02/17 01:01 PM)

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#4447459 - 07/02/17 01:42 PM Re: Shorten OCI w/ ethanol usage? 2014 GM L83 5.3 [Re: 04SE]
zuluplus30 Offline


Registered: 11/23/13
Posts: 358
Loc: Fly-over country
Originally Posted By: 04SE
My 2014 Chevrolet Silverado has the 5.3 L83 engine and I use E85 exclusively. I am almost 2,000 miles into my OCI and the OLM is tracking precisely towards the 7,500 mile OCI that GM recommends.

Ford calls for a severe service OCI when using E85 (according to my previous 2009 FX4). GM doesn't even mention a shortened OCI (for any reason) anywhere that I have found yet for this engine. I thought that GM might have the PCM programmed to shorten the OCI with E85 usage and other factors but she is on track to hit 7,500 miles almost exactly at 0%.

I am running Mobil 1 EP 0w20 w/ Wix 57045 and am planning on an OCI at 3,000 just to see if the E85 is chewing up the oil and see if I have any dilution due to the direct injection.

Thoughts?


Your Oil Life Monitor will account for the E85 automatically and shorten your OCI accordingly. Watch how quickly your oil life drops while running E85.

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#4447502 - 07/02/17 02:46 PM Re: Shorten OCI w/ ethanol usage? 2014 GM L83 5.3 [Re: 04SE]
slacktide_bitog Offline


Registered: 03/20/08
Posts: 6145
Loc: USA
What kind of driving do you do in your truck? Highway miles? Towing? etc

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#4447606 - 07/02/17 04:43 PM Re: Shorten OCI w/ ethanol usage? 2014 GM L83 5.3 [Re: SilverFusion2010]
WyrTwister Offline


Registered: 01/13/13
Posts: 1505
Loc: Texas
Originally Posted By: SilverFusion2010
Originally Posted By: WyrTwister
Flex Fuel engine ?

How does fuel economy on E85 compare to the E10 common here ?

Thanks , :-)
Wyr
God bless


20/25% less mpg. I just run regular pump gas. I've never found an e85 station to be convenient in terms of location. I few tanks of e85 will clean out a motor though. Carbon go bye bye. Also the motor is supposed to add 10HP on e85. I guess ford programmed it to advance the timing



20% - 25% Is about what I have heard . Do not have a flex fuel vehicle , but with the decreased mileage , the cheaper price for E85 seems like just about a wash ? ( There is a convenience store close to work that has E85 . )

Thanks ! :-)

Wyr
God bless
_________________________
Wyr
God bless

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#4447673 - 07/02/17 06:13 PM Re: Shorten OCI w/ ethanol usage? 2014 GM L83 5.3 [Re: 04SE]
SilverFusion2010 Offline


Registered: 06/29/11
Posts: 1657
Loc: Crawfordville FL
I concluded that it was a wash the last time I crunched numbers but it's been years since I seriously looked at it. If you care about using less gasoline then that's a point to consider. Otherwise I think it's kind of a fools fuel. I wish I could find E0 at a reasonable price
_________________________
2010 Ford Fusion SE 3.0L V6, 178k miles M1 HM 10w-30

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#4447876 - 07/02/17 10:23 PM Re: Shorten OCI w/ ethanol usage? 2014 GM L83 5.3 [Re: 04SE]
JFAllen Offline


Registered: 07/31/16
Posts: 154
Loc: Albury, NSW
E85 can pollute sumps, especially in cold start conditions where the fuel mix is rich and no parts are yet at operating temperature (the same is true of normal petrol.) However ethanol poorly mixes with oil - hence potential for problems. Thus, if you only do short trips as part of your regular commute (say <16kms or 10miles) then the oil in the sump never gets hot enough to vaporise the petrol and ethanol components. Plus over the course of your oil change you have a significantly higher number of 'cold starts.' Thus the greater number of events that have the potential to contaminate the oil. If you however do longer commutes, drive long distances regularly or are often putting the engine under load (towing / live in the mountains / sports driving / ...) then the more volatile petrol and ethanol will vaporise and be consumed through your engines crank case breathing system.

Remember ethanol has a boiling point of 78C, while engine oil is supposed to operate at 100C. Petrol likewise has a boiling point far below 100C, though this will vary from region to region / month to month.

Ford have had similar sump pollution problems in their passenger diesels with DPF's. The 'active' regen dumps significant amounts of fuel into the engine to 'burn-off' soot in the filter. However, this causes the cylinder bores to be washed and fuel escapes into the sump. Overtime this excess fuel vaporises.

In theory, engines that burn alcohol fuels 'should' keep their engine oils cleaner though significantly lower soot production. It's just that in certain use cases, oil can become contaminated. And unlike the diesel example, petrol and ethanol have no lubricity. Hence the valid concern.

For the cost of an oil change and if you're curious, it would be good to know the results. But GM gave a warrenty based on their engineering and testing, suggesting 7,500miles.

Regards
Jordan.

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