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PH3980 cut open #4467809
07/23/17 09:05 AM
07/23/17 09:05 AM
Joined: Sep 2013
Posts: 10,901
Indiana
dlundblad Offline OP
dlundblad  Offline OP

Joined: Sep 2013
Posts: 10,901
Indiana
Roughly 3k with Delo 15w30 on my '97 Blazer with the 4.3. I replaced my LIM gaskets last week, drove the truck a bit and changed the oil first thing.

As you can see in the last photo, some crud made it into the engine despite of me placing a bed of towels down into the engine and using a shop vac during gasket removal and surface prep. I'm going to do some pretty severe OCI's until that crude goes away. I'm using an AC Delco PF52 and some Certified 10w30 and will probably change it sometime this week because I'm anal retentive like that.









Last edited by dlundblad; 07/23/17 09:07 AM.

03 Jeep WJ 4.0 202k Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 186k M1 0w40 Mahle OX149D
97 Chevy Blazer 4.3 153k Synpower 5w30 Supertech ST3980 (Ecore)

Re: PH3980 cut open [Re: dlundblad] #4467813
07/23/17 09:09 AM
07/23/17 09:09 AM
Joined: Sep 2013
Posts: 10,901
Indiana
dlundblad Offline OP
dlundblad  Offline OP

Joined: Sep 2013
Posts: 10,901
Indiana
Here's an upside down photo (sorry folks, uploaded from phone.) of under the valve cover. I bought the kit that came with all the replacement gaskets as well. No sludge thankfully, but lots of heavy varnish. The truck was neglected by the PO. 2 year old oil, did a lot of sitting, bad LIM gaskets and a bad/ wrong thermostat.



Last edited by dlundblad; 07/23/17 09:11 AM.

03 Jeep WJ 4.0 202k Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 186k M1 0w40 Mahle OX149D
97 Chevy Blazer 4.3 153k Synpower 5w30 Supertech ST3980 (Ecore)

Re: PH3980 cut open [Re: dlundblad] #4467823
07/23/17 09:24 AM
07/23/17 09:24 AM
Joined: Oct 2005
Posts: 7,094
Colorado
Kuato Offline
Kuato  Offline

Joined: Oct 2005
Posts: 7,094
Colorado
Oil-wise, the valvetrain looks great so suspect the rest of the engine does also.


Thick vs Thin test: 15k / 43k miles complete
Re: PH3980 cut open [Re: dlundblad] #4467885
07/23/17 10:38 AM
07/23/17 10:38 AM
Joined: Dec 2016
Posts: 8,017
Waco, TX
Linctex Offline
Linctex  Offline

Joined: Dec 2016
Posts: 8,017
Waco, TX
Originally Posted By: dlundblad
I'm going to do some pretty severe OCI's until that crude goes away.


No need.

I'm willing to bet you've already caught 99+% of it already


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: PH3980 cut open [Re: dlundblad] #4467886
07/23/17 10:40 AM
07/23/17 10:40 AM
Joined: Dec 2016
Posts: 8,017
Waco, TX
Linctex Offline
Linctex  Offline

Joined: Dec 2016
Posts: 8,017
Waco, TX
Originally Posted By: dlundblad
The truck was neglected by the PO.

2 year old oil, did a lot of sitting,


2 year old oil didn't cause any harm.

The corrosion in that coolant passage is disconcerting.


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: PH3980 cut open [Re: Linctex] #4468041
07/23/17 01:56 PM
07/23/17 01:56 PM
Joined: Sep 2013
Posts: 10,901
Indiana
dlundblad Offline OP
dlundblad  Offline OP

Joined: Sep 2013
Posts: 10,901
Indiana
Originally Posted By: Linctex
Originally Posted By: dlundblad
The truck was neglected by the PO.

2 year old oil, did a lot of sitting,


2 year old oil didn't cause any harm.

The corrosion in that coolant passage is disconcerting.


I agree. There was a mass of crud in these areas on both sides of the engine. The intake had a bit of pitting too.


03 Jeep WJ 4.0 202k Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 186k M1 0w40 Mahle OX149D
97 Chevy Blazer 4.3 153k Synpower 5w30 Supertech ST3980 (Ecore)

Re: PH3980 cut open [Re: dlundblad] #4468091
07/23/17 03:02 PM
07/23/17 03:02 PM
Joined: Jul 2015
Posts: 3,772
MD
AirgunSavant Offline
AirgunSavant  Offline

Joined: Jul 2015
Posts: 3,772
MD
My father left me his Blazer a 2000 model. Garage queen.
Well maintained but a gas hog.... I guess they are all that way. I take good care of it because he
loved it. First new car he ever bought for himself.

Re: PH3980 cut open [Re: dlundblad] #4468685
07/24/17 07:59 AM
07/24/17 07:59 AM
Joined: Aug 2015
Posts: 3,062
NC
BigD1 Offline
BigD1  Offline

Joined: Aug 2015
Posts: 3,062
NC
Filter looks to held up good. Must be an older 3980 because the seam is glued now.

That engine actually looks very good, and the varnish is no problem.

I would definitely do some type of coolant flush cleaning. The Mercedes citrus flush is an option.

http://dieselgiant.com/mercedes_citrus_flush.htm





1992 Toyota Pickup--PYB 10W-30--Fram PH3614
Re: PH3980 cut open [Re: BigD1] #4468762
07/24/17 09:38 AM
07/24/17 09:38 AM
Joined: Dec 2004
Posts: 10,345
1/2 hr N.E. of Detroit
Triple_Se7en Offline
Triple_Se7en  Offline

Joined: Dec 2004
Posts: 10,345
1/2 hr N.E. of Detroit
All that varnish reminded me of the 80s and early 90s when I used Castrol oil and varnish was included in every bottle back then.

I've never purchased Castrol since..... not even their synthetics. When I see an issue with any products (oil or even handgun bullets for example), I avoid repurchases like the plague.... for decades.


2019 Hyundai SantaFe 2.4 factory fill QS 5w20 / Factory OEM oil filter
04 Chev Colorado 3.5 QS / Valv syn 5w30 blend K&N filter
03 Chev Malibu 3.1 QS / Valv Syn 5w30 blend Fram EG filter
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