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#4523121 - 09/22/17 12:18 PM GM Oil Life Monitor - OCI With Synthetic
ChrisD46 Offline


Registered: 09/10/10
Posts: 1895
Loc: GA.
For a 2005 Trail Blazer with 4.2L I-6 :

* When to change oil - 0% or do you change at a higher % (i.e. 10% , 15% , 20% )?
* With synthetic oil - would you feel more comfortable to run the GM OLM down to 0% or even re-set and run down to 50% to 75% ?

I would have to believe an '05 Trail Blazer OLM was developed around conventional oil thus you could run synthetic oil longer ?
GM just states "with synthetic oil simply follow the OLM for a cleaner engine" ... Your thoughts , experiences and preferances for above ?
_________________________
2017 Hyundai Sonata 2.4L GDI 4 cylinder
2010 Hyundai Elantra 2.0L 4 cylinder
2007 Kia Sedona 3.8L 6 cylinder

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#4523127 - 09/22/17 12:25 PM Re: GM Oil Life Monitor - OCI With Synthetic [Re: ChrisD46]
RoGuE Offline


Registered: 02/05/08
Posts: 680
Loc: Atlanta, GA
I use Pennzoil Platinum and usually change the oil when it hits 1 year, which comes out to about 6000-7000 miles. That will usually show 25% on the OLM.
_________________________
2007 Chevrolet Malibu
2.2L Ecotec

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#4523134 - 09/22/17 12:31 PM Re: GM Oil Life Monitor - OCI With Synthetic [Re: ChrisD46]
dogememe Offline


Registered: 04/15/17
Posts: 596
Loc: SF BAY AREA, CA
The 4.2 is pretty easy on oil, you can follow OLM smile


Edited by dogememe (09/22/17 12:31 PM)
_________________________
2007 Ford Crown Vic P71 4.6 ~124K Miles, Valvoline SynPower 5W-30, Royal Purple Filter *Daily Driver*
2010 Ford Escape 2.5 ~70K Miles, Valvoline SynPower 5W-30, Wix Filter *Turo Rental Car*

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#4523149 - 09/22/17 12:51 PM Re: GM Oil Life Monitor - OCI With Synthetic [Re: dogememe]
gabriel9766 Offline


Registered: 05/10/15
Posts: 936
Loc: Missouri
I would run the OLM down to zero no problem.

For example, my malibu requires at least a syn blend dexos oil and to follow the OLM and at least change it once a year. I run full syn 0w20 in it and change it between 15-20% oil life yet. Im at 19% left on the oil life now, so it should be getting changed in the next 2 weeks.
_________________________
2015 Chevy Malibu 1LT DI 2.5L I4- PPPP 0w20 and a napa gold 7060 39,829K

2007 Ford Escape XLT FWD 3.0 V6 motorcraft 5w30 bulk and a motorcraft FL500s 109,944K


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#4523164 - 09/22/17 01:13 PM Re: GM Oil Life Monitor - OCI With Synthetic [Re: ChrisD46]
benjy Offline


Registered: 08/23/10
Posts: 865
Loc: pa
sisters 2010 malibu 3.6 that i change oil, she uses the OLM usually under 10% not sure of miles. last change i put in 6 qt by accident as it takes 5.5 so i drained a half qt out of the pan before starting it, surprised of the "sludgy" look of the new oil mixed what was on the bottom of the pan. i am picky draining all the oil i can by jacking the car to do so. the following change was after a good drive + very hot as i like to do + i got some more sludgy out!! i always recommend to the family members getting it very hot before changing, but not my rides so its their choice! surprising oil is barely lukewarm after 10 miles!!! bother-in-law buys pennz plat for it since they bought it at 30,xxx miles so history is not known


Edited by benjy (09/22/17 01:15 PM)

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#4523167 - 09/22/17 01:19 PM Re: GM Oil Life Monitor - OCI With Synthetic [Re: ChrisD46]
WobblyElvis Online   content


Registered: 09/23/14
Posts: 1342
Loc: Toronto Canada
Ran a 2006 Malibu to 15,000 miles with 3 quarts of make up oil. OLM was run down to zero twice but the UOA said oil was fine. Every UOA I've done suggested the OLM was very conservative. I use a mix of whatever oil is on sale, conventional or synthetic.

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#4523175 - 09/22/17 01:28 PM Re: GM Oil Life Monitor - OCI With Synthetic [Re: ChrisD46]
barkingspider Offline


Registered: 12/22/13
Posts: 2040
Loc: socal
Under 10% left on the OLM is a good time
_________________________
06 Cadillac Escalade Ext
17 Cadillac ATS (wife)
05 Toyota Camry (daughter)
11 GMC Canyon off-road (daily)

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#4523187 - 09/22/17 01:44 PM Re: GM Oil Life Monitor - OCI With Synthetic [Re: ChrisD46]
oil_film_movies Offline


Registered: 06/13/16
Posts: 2548
Loc: MN
Originally Posted By: ChrisD46
For a 2005 Trail Blazer with 4.2L I-6 :
* When to change oil - 0% or do you change at a higher % (i.e. 10% , 15% , 20% )?
* With synthetic oil - would you feel more comfortable to run the GM OLM down to 0% or even re-set and run down to 50% to 75% ?
I would have to believe an '05 Trail Blazer OLM was developed around conventional oil thus you could run synthetic oil longer ?
GM just states "with synthetic oil simply follow the OLM for a cleaner engine" ... Your thoughts , experiences and preferances for above ?

Thats all correct. GM designed the OLM back then to use older conventional oil, SL GF-3. I'd use M1 Extended Performance or Castrol Edge gold jug extended perf 5w30 in that at 1.5 x OLM. M1 Annual Protection at 2 x OLM. Fram Ultra oil filter for better performance too. Watch oil level closely over those long intervals.

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#4523194 - 09/22/17 01:55 PM Re: GM Oil Life Monitor - OCI With Synthetic [Re: ChrisD46]
ATex7239 Offline


Registered: 01/19/17
Posts: 331
Loc: Texas,USA
Follow the OLM, keep it topped off, and you'll be fine.

125K on our Buick with SynBlend and oil changes between 10-25% on the OLM. And it's still plugging along just fine.

I'm not religious about my OCI's, I do it based on when it's convenient for me to do it.
_________________________
'12 Buick Enclave 139,xxx
Valvoline ML SynBlend 5w30
ACDelco PF63E

'17 Ford Fusion (Company Lease) 42,xxx
Oil Don't know
Filter Don't care

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#4523212 - 09/22/17 02:21 PM Re: GM Oil Life Monitor - OCI With Synthetic [Re: benjy]
Malo83 Offline


Registered: 08/08/08
Posts: 1999
Loc: Cali
Originally Posted By: benjy
sisters 2010 malibu 3.6 that i change oil, she uses the OLM usually under 10% not sure of miles. last change i put in 6 qt by accident as it takes 5.5 so i drained a half qt out of the pan before starting it, surprised of the "sludgy" look of the new oil mixed what was on the bottom of the pan. i am picky draining all the oil i can by jacking the car to do so. the following change was after a good drive + very hot as i like to do + i got some more sludgy out!! i always recommend to the family members getting it very hot before changing, but not my rides so its their choice! surprising oil is barely lukewarm after 10 miles!!! bother-in-law buys pennz plat for it since they bought it at 30,xxx miles so history is not known

I do 5K oil changes on my 08 Malibu LTZ 3.6, I put 6qts in my 3.6 with the longer Wix filter 57045 and Pennz Platinum, never used the OLM. cheers

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#4523213 - 09/22/17 02:22 PM Re: GM Oil Life Monitor - OCI With Synthetic [Re: ChrisD46]
tig1 Offline


Registered: 01/03/09
Posts: 13655
Loc: Illinois
I change my oil at 10K regardless of what some gadget says.
_________________________
2007 Ford Fusion 227,000 miles
M1 0-20 EP
2017 Ford Fusion 49K
M1 0-20 EP
10,000 mile OCIs on both engines
M1 ATF and MC LV
M1 10-30 in all OPE
MC filters


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#4523232 - 09/22/17 02:35 PM Re: GM Oil Life Monitor - OCI With Synthetic [Re: ChrisD46]
Kuato Offline


Registered: 10/23/05
Posts: 7094
Loc: Colorado
Originally Posted By: ChrisD46
For a 2005 Trail Blazer with 4.2L I-6 :

* When to change oil - 0% or do you change at a higher % (i.e. 10% , 15% , 20% )?
* With synthetic oil - would you feel more comfortable to run the GM OLM down to 0% or even re-set and run down to 50% to 75% ?

I would have to believe an '05 Trail Blazer OLM was developed around conventional oil thus you could run synthetic oil longer ?
GM just states "with synthetic oil simply follow the OLM for a cleaner engine" ... Your thoughts , experiences and preferances for above ?


If you're being conservative, go to 0-5% and change. If you're interested in getting the most out of your oil, then sample at 10% and go from there.
_________________________
Thick vs Thin test: 15k / 43k miles complete

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#4523244 - 09/22/17 02:43 PM Re: GM Oil Life Monitor - OCI With Synthetic [Re: tig1]
oil_film_movies Offline


Registered: 06/13/16
Posts: 2548
Loc: MN
Originally Posted By: tig1
I change my oil at 10K regardless of what some gadget says.

I change my oil at the OLM regardless of some people's obsession with the number 10k.

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#4523268 - 09/22/17 03:08 PM Re: GM Oil Life Monitor - OCI With Synthetic [Re: tig1]
Whimsey Offline


Registered: 12/22/02
Posts: 4047
Loc: The Garden State
Originally Posted By: tig1
I change my oil at 10K regardless of what some gadget says.


Easy to do in a non turbo non direct injection engine. I run my 4.6 V-8 and 2.0 Zetec to similar to your OCI's and everything is just ducky. HOWEVER with our new 2.3 EcoBoost Explorer I have to watch the OCI much more carefully, even using Mobil 1 5W-30 grin , As these engines tend to be much more brutal on oil life. I'm doing some UOA's to see if I can establish a reasonable OCI. Of course the million $$$ question is does or how much fuel dilution in the oil causes wear metals for turbo DI engines to effect OCI's. Hopefully I'll see a pattern

Whimsey

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#4523269 - 09/22/17 03:10 PM Re: GM Oil Life Monitor - OCI With Synthetic [Re: ChrisD46]
bigj_16 Offline


Registered: 07/03/17
Posts: 1267
Loc: Douglas County, Colorado
Keep rollin', Whimsey. I'm with you.

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