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Cobalt VVT Actuator (divided by) oil change? #4512578
09/10/17 05:43 PM
09/10/17 05:43 PM
Joined: Apr 2016
Posts: 1,198
Campbellsville, KY
Alex_V Offline OP
Alex_V  Offline OP
Joined: Apr 2016
Posts: 1,198
Campbellsville, KY
In the last 4 months or so I've changed the oil (once, each) in two 2010 Cobalts; one with about 95K (VML 5w30) and one with 160K (Napa conventional 5w30). The lower mileage one is probably driven more gently and maintained better (at least as far as OCI goes) but my guess is both have spent at least the last 2-3 years on bulk oil from the local quick lane. But here's the puzzler: I've also changed the intake VVT actuator on both of them after the oil change. The lower mileage car was probably a month or two after the OC, but the higher mileage one was the next week.

Coincidence, or better oil scrubbing gunk out of the engines and plugging up the actuators...?


To quote a friend, "Synthetics, man."

'85 GMC C3500, 454, 132K
'82 Mercedes 300CD, OM617 turbo, 173K (totaled 2018, in rehab)
'85 Mercedes 300TD, OM617 turbo, 217K (wife's)
'67 Suburban, 350, 331K
Re: Cobalt VVT Actuator (divided by) oil change? [Re: Alex_V] #4512583
09/10/17 05:49 PM
09/10/17 05:49 PM
Joined: Dec 2014
Posts: 1,684
'murica
Ethan1 Offline
Ethan1  Offline
Joined: Dec 2014
Posts: 1,684
'murica
What did the screens look like? Were they covered in hard or soft deposits? Pretty interesting.

Re: Cobalt VVT Actuator (divided by) oil change? [Re: Alex_V] #4512627
09/10/17 06:31 PM
09/10/17 06:31 PM
Joined: Apr 2016
Posts: 1,198
Campbellsville, KY
Alex_V Offline OP
Alex_V  Offline OP
Joined: Apr 2016
Posts: 1,198
Campbellsville, KY
Nope, the internal part of the sensors looked very clean.


To quote a friend, "Synthetics, man."

'85 GMC C3500, 454, 132K
'82 Mercedes 300CD, OM617 turbo, 173K (totaled 2018, in rehab)
'85 Mercedes 300TD, OM617 turbo, 217K (wife's)
'67 Suburban, 350, 331K
Re: Cobalt VVT Actuator (divided by) oil change? [Re: Alex_V] #4512637
09/10/17 06:43 PM
09/10/17 06:43 PM
Joined: Jun 2003
Posts: 33,555
ME
eljefino Offline
eljefino  Offline
Joined: Jun 2003
Posts: 33,555
ME
MILs lacrosse hybrid ecotec 2.4 had these done at 55k. She goes by the OLM but it gets full syn dexos. Cold starts it to drive in circles to smoke at work b/c she can't smoke on campus.

Figure it's just a precious snowflake design.

Re: Cobalt VVT Actuator (divided by) oil change? [Re: Alex_V] #4512732
09/10/17 09:00 PM
09/10/17 09:00 PM
Joined: Feb 2009
Posts: 17,290
Michigan
daves87rs Offline
daves87rs  Offline
Joined: Feb 2009
Posts: 17,290
Michigan
No problem here....yet....2006 Cobalt...


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