Oil consumption on 6.2 diesels? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**rs74** · 03-24-2018, 11:05 AM

I have only had two 6.2's and one (85 K30) I only drove a few times. When I had my 84 short bed the first time around it used quite a bit more oil than I would think it should use. It runs like a top but does smoke quite a bit. The smoke seems to go away more after it is good and warmed up but still uses oil. Exactly what should I expect of the 6.2's as far as oil consumption within a 3000 mile period?

andyh1956 · 03-24-2018, 01:32 PM

I have three 6.2 & one 6.5 & none need much oil between changes, never more than one quart.
I don't drive the 6.2s much anymore but if yours is in good condition & the depression regulator is good it shouldn't use no whole lot of oil.

**rs74** · 03-24-2018, 02:52 PM

Quote:

Originally Posted by andyh1956

I have three 6.2 & one 6.5 & none need much oil between changes, never more than one quart.
I don't drive the 6.2s much anymore but if yours is in good condition & the depression regulator is good it shouldn't use no whole lot of oil.

It runs very good in my opinion. I'm just not quite sure where to start with finding out my it uses so much oil.

andyh1956 · 03-25-2018, 12:34 PM

Start by looking down into the intake & see if there is evidence of oil puddling. DRs don't last indefinitely.

**hatzie** · 03-25-2018, 02:12 PM

You may be able to clean a sludged up CDR with Dawn and hot water.

**rs74** · 03-25-2018, 03:05 PM

Quote:

Originally Posted by hatzie

You may be able to clean a sludged up CDR with Dawn and hot water.

I think I am going to try and clean it first. I went out to look at it and noticed the hose underneath it. It's in pretty rough shape and looks like someone has tried to repair it in the past. I am trying to find if this is available aftermarket or dealer now. I haven't had any luck so far today finding a picture of it or a part number to reference from. Here is the old hose that goes to the bottom side of the CDR.

**hatzie** · 03-25-2018, 07:38 PM

You can use SAE J30R7 hose. Just need to get the correct diameter.

Check Rockauto. The CDR isn't available but the hoses might be.

**rs74** · 03-26-2018, 10:18 AM

I will probably have to end up fabbing something up if I can't find the OE part. I did come across the GM part number for the hose but it was discontinued years ago and no aftermarket available from what I see. I am also going to see if I can get the old CDR valve apart to clean it and if not I have found one that I can purchase. Hopefully either cleaning the old one or putting the new one will help with the oil consumption. Pic of the OE part.

tucsonjwt · 03-26-2018, 04:04 PM

If you know the part number you can check Vintage Parts. I found an air cleaner intake hose for my 83 C20 there. They cannot help you unless you have the part number. Prices are not cheap.

https://www.vpartsinc.com/

03-24-2018, 11:05 AM	#1
rs74 Senior Member Join Date: Jun 2010 Location: Illinois Posts: 2,957	Oil consumption on 6.2 diesels? I have only had two 6.2's and one (85 K30) I only drove a few times. When I had my 84 short bed the first time around it used quite a bit more oil than I would think it should use. It runs like a top but does smoke quite a bit. The smoke seems to go away more after it is good and warmed up but still uses oil. Exactly what should I expect of the 6.2's as far as oil consumption within a 3000 mile period? __________________ Roy 85 Short Bed Silverado- Work in progress. http://67-72chevytrucks.com/vboard/s...d.php?t=564818 1987 R10 shortie

03-24-2018, 01:32 PM	#2
andyh1956 Registered User Join Date: Mar 2010 Location: thomastown mississippi Posts: 1,261	Re: Oil consumption on 6.2 diesels? I have three 6.2 & one 6.5 & none need much oil between changes, never more than one quart. I don't drive the 6.2s much anymore but if yours is in good condition & the depression regulator is good it shouldn't use no whole lot of oil.

03-25-2018, 12:34 PM	#4
andyh1956 Registered User Join Date: Mar 2010 Location: thomastown mississippi Posts: 1,261	Re: Oil consumption on 6.2 diesels? Start by looking down into the intake & see if there is evidence of oil puddling. DRs don't last indefinitely.

03-25-2018, 02:12 PM	#5
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,977	Re: Oil consumption on 6.2 diesels? You may be able to clean a sludged up CDR with Dawn and hot water. __________________ 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.

03-25-2018, 07:38 PM	#7
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,977	Re: Oil consumption on 6.2 diesels? You can use SAE J30R7 hose. Just need to get the correct diameter. Check Rockauto. The CDR isn't available but the hoses might be. __________________ 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.

03-26-2018, 10:18 AM	#8
rs74 Senior Member Join Date: Jun 2010 Location: Illinois Posts: 2,957	Re: Oil consumption on 6.2 diesels? I will probably have to end up fabbing something up if I can't find the OE part. I did come across the GM part number for the hose but it was discontinued years ago and no aftermarket available from what I see. I am also going to see if I can get the old CDR valve apart to clean it and if not I have found one that I can purchase. Hopefully either cleaning the old one or putting the new one will help with the oil consumption. Pic of the OE part. Attached Images __________________ Roy 85 Short Bed Silverado- Work in progress. http://67-72chevytrucks.com/vboard/s...d.php?t=564818 1987 R10 shortie

03-26-2018, 04:04 PM	#9
tucsonjwt Registered User Join Date: Jul 2007 Location: Tucson, AZ Posts: 3,189	Re: Oil consumption on 6.2 diesels? If you know the part number you can check Vintage Parts. I found an air cleaner intake hose for my 83 C20 there. They cannot help you unless you have the part number. Prices are not cheap. https://www.vpartsinc.com/



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