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2018 Honda Civic 1.5l Turbo: octane? Oil? #4785849
06/13/18 12:31 PM
06/13/18 12:31 PM
Joined: Jun 2013
Posts: 709
Northeast
Finz Offline OP
Finz  Offline OP

Joined: Jun 2013
Posts: 709
Northeast
Ended up leasing the civic I posted about previously... Sedan with 6 speed manual. Car is an absolute blast to drive, and Iím in the 500 mile neighborhood

This engine, 1.5l turbo, has lots written about on here and Civic/CRV forums so I have 3 questions in an effort to get as close to a final/correct answer as possible:

1. Many threads about using 91 octane vs owner manualís 87 octane to combat fuel dilution. I canít figure out how or why a higher octane would help....? Thought octane was relative to compression (only).

2. Iím going to disregard mm and change factory fill early... I figured at 1k miles. Is that a good number? sooner? Later? Prolonged exposure to a higher moly constant has been discussed.... I have a can of Lubriguard Moly lying around if that might help

3. With regard to fuel dilution, plan on oil changes every 5k. Lots of very short trips in this carís future. Many have suggested a heavier weight oil to help combat the fuel dilution. Car calls for 0W-20. I have a jug of Mobil European Formula at 0W-40. Is that too steep of a jump right off the bat? Ever? I know a turbo can be taxing on the oil as well.

Thank you for any input

óbob


God Bless America
Re: 2018 Honda Civic 1.5l Turbo: octane? Oil? [Re: Finz] #4785855
06/13/18 12:37 PM
06/13/18 12:37 PM
Joined: May 2010
Posts: 1,319
Ocala, Florida
racin4ds Offline
Happy Birthday racin4ds  Offline

Joined: May 2010
Posts: 1,319
Ocala, Florida
If you're leasing it then you're not worried about it lasting nor are you planning to keep it so I'd just use whatever the OM tells you to. IF you plan to keep it long term and want it to last, I'd ignore the OM and run a 5W30 and being its a turbocharged engine with high compression, I'd never run less than 91 octane, anything less is just stupid!


Just say NO to thin oils and M1!
05 F350 Powerstroke
05 Hyundai Tucson
08 Legacy GT
Re: 2018 Honda Civic 1.5l Turbo: octane? Oil? [Re: Finz] #4785857
06/13/18 12:40 PM
06/13/18 12:40 PM
Joined: Oct 2014
Posts: 13,804
Canyon County Idaho
CT8 Offline
CT8  Offline

Joined: Oct 2014
Posts: 13,804
Canyon County Idaho
Doing any maintenance on a lease is foolish.


2015 F150 2.7
2018 F350 6.2
Re: 2018 Honda Civic 1.5l Turbo: octane? Oil? [Re: racin4ds] #4785861
06/13/18 12:42 PM
06/13/18 12:42 PM
Joined: Jun 2013
Posts: 709
Northeast
Finz Offline OP
Finz  Offline OP

Joined: Jun 2013
Posts: 709
Northeast
Originally Posted By: racin4ds
If you're leasing it then you're not worried about it lasting nor are you planning to keep it so I'd just use whatever the OM tells you to. IF you plan to keep it long term and want it to last, I'd ignore the OM and run a 5W30 and being its a turbocharged engine with high compression, I'd never run less than 91 octane, anything less is just stupid!



Thanks Racin... I know Iím leasing but want the next owner to be assured it was well kept and I donít mind oil changes

So you feel the 0W-40 is no good?

being its a turbocharged engine with high compression. Why do you say this...? I assumed the all high compression engines called for higher octane. This car indicates 87 is fine (Sport and SI might be different)


God Bless America
Re: 2018 Honda Civic 1.5l Turbo: octane? Oil? [Re: Finz] #4785868
06/13/18 12:50 PM
06/13/18 12:50 PM
Joined: Apr 2012
Posts: 10,855
Kendall, FL
wemay Offline
wemay  Offline

Joined: Apr 2012
Posts: 10,855
Kendall, FL
Sweet car with a manual transmission! Congrats. I would let the dealership take care of the oil changes on a lease. There is a member on here running 0W-40 though... he seems to like it.

IF i were to own one, i'd stick to 0W20 and follow the OLM and conduct a few UOA. If, after 3-4 UOA, the report showed accelerated wear, i'd bump up to 0/5W30. But also remember, initial UOA on a new car show more wear metals than after break-in.



2018 KIA Sportage 2.4 AWD:
CQ Syn 5W-20, CQ 85334
Next: O'Reilly 5W-30, MGL51334

2013 Hyundai Santa Fe Sport 2.0T:
QSUD 5W-30, OEM
Next: SAME


Re: 2018 Honda Civic 1.5l Turbo: octane? Oil? [Re: Finz] #4785870
06/13/18 12:53 PM
06/13/18 12:53 PM
Joined: Jun 2017
Posts: 889
ZFW
JustN89 Online content
JustN89  Online Content

Joined: Jun 2017
Posts: 889
ZFW
Originally Posted By: Finz
Originally Posted By: racin4ds
If you're leasing it then you're not worried about it lasting nor are you planning to keep it so I'd just use whatever the OM tells you to. IF you plan to keep it long term and want it to last, I'd ignore the OM and run a 5W30 and being its a turbocharged engine with high compression, I'd never run less than 91 octane, anything less is just stupid!



Thanks Racin... I know Iím leasing but want the next owner to be assured it was well kept and I donít mind oil changes

So you feel the 0W-40 is no good?

being its a turbocharged engine with high compression. Why do you say this...? I assumed the all high compression engines called for higher octane. This car indicates 87 is fine (Sport and SI might be different)




Not necessarily, no. I also wouldn't exactly call the Civic a high compression engine either being at 10.8:1. The 2018 Elantra (2.0L) runs at 12.5:1 compression and doesn't require anything other than 87 octane.

Re: 2018 Honda Civic 1.5l Turbo: octane? Oil? [Re: Finz] #4785872
06/13/18 12:54 PM
06/13/18 12:54 PM
Joined: Dec 2011
Posts: 6,252
North Carolina
rooflessVW Offline
rooflessVW  Offline

Joined: Dec 2011
Posts: 6,252
North Carolina
On a lease I didn't intend to keep I would run the cheapest oil and fuel I could find.

On a purchase or lease or I intend to keep I would run Top-Tier premium fuel and 0W-40.


"Zed's dead baby, Zed's dead."
Re: 2018 Honda Civic 1.5l Turbo: octane? Oil? [Re: Finz] #4785876
06/13/18 12:57 PM
06/13/18 12:57 PM
Joined: Dec 2008
Posts: 3,233
Occupied Virginia
Bottom_Feeder Offline
Bottom_Feeder  Offline

Joined: Dec 2008
Posts: 3,233
Occupied Virginia
Originally Posted By: Finz
1. Many threads about using 91 octane vs owner manualís 87 octane to combat fuel dilution. I canít figure out how or why a higher octane would help....? Thought octane was relative to compression (only).

I'd like to know this also.

Re: 2018 Honda Civic 1.5l Turbo: octane? Oil? [Re: Finz] #4785883
06/13/18 01:01 PM
06/13/18 01:01 PM
Joined: Sep 2004
Posts: 22,738
Central Florida
Mr Nice Offline
Mr Nice  Offline

Joined: Sep 2004
Posts: 22,738
Central Florida
Leasing = follow the OLM.

No need to worry.

Re: 2018 Honda Civic 1.5l Turbo: octane? Oil? [Re: Mr Nice] #4785898
06/13/18 01:19 PM
06/13/18 01:19 PM
Joined: Jun 2013
Posts: 709
Northeast
Finz Offline OP
Finz  Offline OP

Joined: Jun 2013
Posts: 709
Northeast
Thanks for all the input. Let me ask this another way (disregard the fact Iím leasing):

* When is a good time/mileage to replace the factory fill?
* Does a high octane gas help with fuel dilution on a car that calls for 87 octane? How?
* Would a 0W-40 be overkill in a civic in an effort to mitigate fuel dilution? Car calls for 0W-20 but I have a jug of 0W-40

I appreciate the responses so far...

Thanks again


God Bless America
Re: 2018 Honda Civic 1.5l Turbo: octane? Oil? [Re: Finz] #4785904
06/13/18 01:24 PM
06/13/18 01:24 PM
Joined: Jan 2008
Posts: 11,399
OH
SatinSilver Offline
SatinSilver  Offline

Joined: Jan 2008
Posts: 11,399
OH
In the 2018 Civic Hatch Sport and Sport Touring model Honda states that premium fuel is recommended. Same engine but has 10 more HP and a different exhaust or at least the tailpipe is different. If you notice the oil level increasing I would switch to premium. Premium seems to keep it under control. One of the biggest complaints with on www.carcomplaints.com is the increasing oil level with the 2017 CRV which has the same engine.

Also time to update your signature line. smile


Re: 2018 Honda Civic 1.5l Turbo: octane? Oil? [Re: SatinSilver] #4785906
06/13/18 01:29 PM
06/13/18 01:29 PM
Joined: Jun 2013
Posts: 709
Northeast
Finz Offline OP
Finz  Offline OP

Joined: Jun 2013
Posts: 709
Northeast
Originally Posted By: SatinSilver
In the 2018 Civic Hatch Sport and Sport Touring model Honda states that premium fuel is recommended. Same engine but has 10 more HP and a different exhaust or at least the tailpipe is different. If you notice the oil level increasing I would switch to premium. Premium seems to keep it under control. One of the biggest complaints with on www.carcomplaints.com is the increasing oil level.

Also time to update your signature line. smile




Ha...! Fixed signature....(forgot all about it)

Any idea why premium would help with increased oil level/Fuel dilution?

Iím not arguing itís apparent effectiveness.... just tying to understand how/why


God Bless America
Re: 2018 Honda Civic 1.5l Turbo: octane? Oil? [Re: Finz] #4785911
06/13/18 01:36 PM
06/13/18 01:36 PM
Joined: Jan 2008
Posts: 11,399
OH
SatinSilver Offline
SatinSilver  Offline

Joined: Jan 2008
Posts: 11,399
OH
Not sure and haven't looked into it. Lately I've been using premium in the Matrix because the power seemed down. I looked at the owner's manual and it stated use 87 or higher. It said something else about using premium but can't remember the exact verbiage. I know acceleration is much quicker and people aren't raising their hands gesturing about accelerating too slow. Now I can pull away from them. This is Shell Or BP 93 octane since they don't have 91. Just 87-89-93. I could floor it on 87 but really don't want to do that.

Re: 2018 Honda Civic 1.5l Turbo: octane? Oil? [Re: Finz] #4785930
06/13/18 01:49 PM
06/13/18 01:49 PM
Joined: May 2017
Posts: 1,049
TX
parshisa Offline
parshisa  Offline

Joined: May 2017
Posts: 1,049
TX
91/93 octane + good synthic=good engine health (low FD and wear numbers)

Re: 2018 Honda Civic 1.5l Turbo: octane? Oil? [Re: Finz] #4785939
06/13/18 02:19 PM
06/13/18 02:19 PM
Joined: May 2010
Posts: 1,319
Ocala, Florida
racin4ds Offline
Happy Birthday racin4ds  Offline

Joined: May 2010
Posts: 1,319
Ocala, Florida
Any engine over 10.5:1 is relatively high compression then you add forced induction on top, absolute MIN octane should be 91 octane! These OEM's detuning these cars just to say they can run 87 junk is ridiculous! If you OP for the turbocharged option you had better be ready to buy premium fuel, plain and simple.

Last edited by racin4ds; 06/13/18 02:20 PM.

Just say NO to thin oils and M1!
05 F350 Powerstroke
05 Hyundai Tucson
08 Legacy GT
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