DIY valve cover mod to address Oil consumption for LS motors. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**hatzie** · 04-04-2021, 08:26 PM

This guy shows how to modify the valve cover baffles to enhance the oil vapor separation and drainback the oil rather than ingesting it into the intake.
http://youtu.be/CePGNsAkcYQ

bigd65 · 04-05-2021, 09:46 AM

I just watched it... great video. Do you happen to know what years this might be the problem... now I'm wanting to remove my covers and check

**Boog** · 04-05-2021, 05:22 PM

There are a number of videos I've watched about this oil consumption "fix". A couple of guys say there is a later GM version of valve cover with a bit different baffle. I wonder if a guy could insert some wire mesh into the large opening of the valve cover baffle to separate oil and air at that point much like the pre pcv engines of old had in their crank case breather/oil fill caps.
Also there are a number of guys adding oil catch cans into the pcv system. Pretty simple. Google oil catch cans and you'll find a few vids out there on that too. I bought a new pcv valve for my 03 Tahoe and was surprised to find it is a hollow case only. There is no check ball inside so it pulls engine oil vapors full time. If it left GM that way it has to be right, right? My Tahoe with 265,000 miles leaks way more than it uses I'm sure. My 09 Yukon with 180,000 miles uses oil. A quart or two between changes and it has that dreaded cylinder deactivation feature that is said to be a cause of oil consumption as well.
You can find videos on youtube on how to fix most anything in the world it seems so you be the judge.

**hatzie** · 04-05-2021, 07:39 PM

It's mostly the AFM engines that have a reputation for oil consumption.
If you aren't loosing oil then I wouldn't worry about it.

If it works it's free. If it doesn't work you're no worse off than you were before drilling the holes in the baffle.

04-04-2021, 08:26 PM	#1
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,977	DIY valve cover mod to address Oil consumption for LS motors. This guy shows how to modify the valve cover baffles to enhance the oil vapor separation and drainback the oil rather than ingesting it into the intake. http://youtu.be/CePGNsAkcYQ __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful.

04-05-2021, 09:46 AM	#2
bigd65 Registered User Join Date: Mar 2000 Location: Clute, TX. Posts: 1,935	Re: DIY valve cover mod to address Oil consumption for LS motors. I just watched it... great video. Do you happen to know what years this might be the problem... now I'm wanting to remove my covers and check __________________ 2004 Silverado Crewcab 1972 Chevy Monte Carlo 2017 Chevy Tahoe Last edited by bigd65; 04-11-2021 at 11:21 AM.

04-05-2021, 05:22 PM	#3
Boog laying low Join Date: Mar 2001 Location: Searcy, Ark. USA Posts: 13,534	Re: DIY valve cover mod to address Oil consumption for LS motors. There are a number of videos I've watched about this oil consumption "fix". A couple of guys say there is a later GM version of valve cover with a bit different baffle. I wonder if a guy could insert some wire mesh into the large opening of the valve cover baffle to separate oil and air at that point much like the pre pcv engines of old had in their crank case breather/oil fill caps. Also there are a number of guys adding oil catch cans into the pcv system. Pretty simple. Google oil catch cans and you'll find a few vids out there on that too. I bought a new pcv valve for my 03 Tahoe and was surprised to find it is a hollow case only. There is no check ball inside so it pulls engine oil vapors full time. If it left GM that way it has to be right, right? My Tahoe with 265,000 miles leaks way more than it uses I'm sure. My 09 Yukon with 180,000 miles uses oil. A quart or two between changes and it has that dreaded cylinder deactivation feature that is said to be a cause of oil consumption as well. You can find videos on youtube on how to fix most anything in the world it seems so you be the judge. __________________ Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross

04-05-2021, 07:39 PM	#4
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,977	Re: DIY valve cover mod to address Oil consumption for LS motors. It's mostly the AFM engines that have a reputation for oil consumption. If you aren't loosing oil then I wouldn't worry about it. If it works it's free. If it doesn't work you're no worse off than you were before drilling the holes in the baffle. __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful.



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