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GM Oil Life Monitor - OCI With Synthetic #4523121
09/22/17 12:18 PM
09/22/17 12:18 PM
Joined: Sep 2010
Posts: 2,026
GA.
ChrisD46 Offline OP
ChrisD46  Offline OP
Joined: Sep 2010
Posts: 2,026
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
Re: GM Oil Life Monitor - OCI With Synthetic [Re: ChrisD46] #4523127
09/22/17 12:25 PM
09/22/17 12:25 PM
Joined: Feb 2008
Posts: 683
Atlanta, GA
RoGuE Offline
RoGuE  Offline
Joined: Feb 2008
Posts: 683
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
Re: GM Oil Life Monitor - OCI With Synthetic [Re: ChrisD46] #4523134
09/22/17 12:31 PM
09/22/17 12:31 PM
Joined: Apr 2017
Posts: 975
SF BAY AREA, CA
dogememe Online content
dogememe  Online Content
Joined: Apr 2017
Posts: 975
SF BAY AREA, CA
The 4.2 is pretty easy on oil, you can follow OLM smile

Last edited by dogememe; 09/22/17 12:31 PM.

2007 Crown Vic P71 4.6 ~127K Miles, RP HPS 5W-30, RP 20-820, Daily Driver.
2010 Escape FWD 2.5 ~90K Miles, Castrol Edge EP 5W-30, Wix 51348, Rented on Turo.
Re: GM Oil Life Monitor - OCI With Synthetic [Re: dogememe] #4523149
09/22/17 12:51 PM
09/22/17 12:51 PM
Joined: May 2015
Posts: 965
Missouri
gabriel9766 Offline
gabriel9766  Offline
Joined: May 2015
Posts: 965
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 Malibu LT 2.5L PPPP 0w20 46.1K
2007 Escape XLT 3.0L 5Q STHM 5w30/1Q MC full syn 5W20 115K
2010 Fusion SE 2.5L MC 0w20 110K
2008 Escape XLT 2.3L MC 5w30 187K
2007 Fusion SE 2.3L- 173.5K STHM 0W20
Re: GM Oil Life Monitor - OCI With Synthetic [Re: ChrisD46] #4523164
09/22/17 01:13 PM
09/22/17 01:13 PM
Joined: Aug 2010
Posts: 1,025
pa
benjy Offline
benjy  Offline
Joined: Aug 2010
Posts: 1,025
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

Last edited by benjy; 09/22/17 01:15 PM.
Re: GM Oil Life Monitor - OCI With Synthetic [Re: ChrisD46] #4523167
09/22/17 01:19 PM
09/22/17 01:19 PM
Joined: Sep 2014
Posts: 1,446
Toronto Canada
WobblyElvis Offline
WobblyElvis  Offline
Joined: Sep 2014
Posts: 1,446
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.

Re: GM Oil Life Monitor - OCI With Synthetic [Re: ChrisD46] #4523175
09/22/17 01:28 PM
09/22/17 01:28 PM
Joined: Dec 2013
Posts: 2,088
socal
barkingspider Offline
barkingspider  Offline
Joined: Dec 2013
Posts: 2,088
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)
Re: GM Oil Life Monitor - OCI With Synthetic [Re: ChrisD46] #4523187
09/22/17 01:44 PM
09/22/17 01:44 PM
Joined: Jun 2016
Posts: 3,003
MN
oil_film_movies Offline
oil_film_movies  Offline
Joined: Jun 2016
Posts: 3,003
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.

Re: GM Oil Life Monitor - OCI With Synthetic [Re: ChrisD46] #4523194
09/22/17 01:55 PM
09/22/17 01:55 PM
Joined: Jan 2017
Posts: 331
Texas,USA
ATex7239 Offline
ATex7239  Offline
Joined: Jan 2017
Posts: 331
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
Re: GM Oil Life Monitor - OCI With Synthetic [Re: benjy] #4523212
09/22/17 02:21 PM
09/22/17 02:21 PM
Joined: Aug 2008
Posts: 2,080
Cali
Malo83 Offline
Malo83  Offline
Joined: Aug 2008
Posts: 2,080
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

Re: GM Oil Life Monitor - OCI With Synthetic [Re: ChrisD46] #4523213
09/22/17 02:22 PM
09/22/17 02:22 PM
Joined: Jan 2009
Posts: 13,837
Illinois
tig1 Offline
tig1  Offline
Joined: Jan 2009
Posts: 13,837
Illinois
I change my oil at 10K regardless of what some gadget says.


2007 Ford Fusion 232,000 miles
M1 0-20 EP
2017 Ford Fusion 55K
M1 0-20 EP
10,000 mile OCIs on both engines
M1 ATF and MC LV
M1 10-30 in all OPE
MC filters

Re: GM Oil Life Monitor - OCI With Synthetic [Re: ChrisD46] #4523232
09/22/17 02:35 PM
09/22/17 02:35 PM
Joined: Oct 2005
Posts: 7,094
Colorado
Kuato Offline
Kuato  Offline
Joined: Oct 2005
Posts: 7,094
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
Re: GM Oil Life Monitor - OCI With Synthetic [Re: tig1] #4523244
09/22/17 02:43 PM
09/22/17 02:43 PM
Joined: Jun 2016
Posts: 3,003
MN
oil_film_movies Offline
oil_film_movies  Offline
Joined: Jun 2016
Posts: 3,003
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.

Re: GM Oil Life Monitor - OCI With Synthetic [Re: tig1] #4523268
09/22/17 03:08 PM
09/22/17 03:08 PM
Joined: Dec 2002
Posts: 4,154
The Garden State
Whimsey Online content
Whimsey  Online Content
Joined: Dec 2002
Posts: 4,154
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

Re: GM Oil Life Monitor - OCI With Synthetic [Re: ChrisD46] #4523269
09/22/17 03:10 PM
09/22/17 03:10 PM
Joined: Jul 2017
Posts: 1,292
Douglas County, Colorado
bigj_16 Offline
bigj_16  Offline
Joined: Jul 2017
Posts: 1,292
Douglas County, Colorado
Keep rollin', Whimsey. I'm with you.

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