2004 GMC 2500HD
burning oil?
seems that my 6.5TD (1995 L65 model) burns a bit of oil, but I can not tell. Is it normal for these older diesels to burn oil? I checked the oil after I changed it, probably about 2000 miles, and it took 2 quarts to fill it to the top mark. Maybe I did not fill it enough when I changed it, but I don't know. I checked it the other day, about 1200 miles later, and it did go down about 1/2 to 3/4 of one quart. Is this normal, or should I be worried at all? Any help is awesome. Thanks.
James
Administrator
Less than 1 qt. per 1000 miles isn't excessive, and considered normal by some folks. The type of vehicle usage also has an effect on how much oil is consumed. Many of these engines "use" more than that with no issues, for many miles.
Enthusiast
How many miles are on the rig?
How much blow-by do you have coming out of the oil filler tube when the engine is idling?
any more than 1qt in 1k miles and you can be concerned, some use it, some don't (mine).
What oil are you using?
I noticed that using Delo in place of the Pennzoil I used to run (no more) resulted in increased oil consumption. I'm happy with the Rotella-T I'm running now, almost no oil consumption in my higher blow-by '82 6.2 pickup (who knows how many miles...).
J
1982 C10 SCSWB 6.5TD, mods too extensive to list. (13.69 1/4 mile @94.6 MPH) RACE TRUCK
1982 C10 SCSWB 6.2NA, 2.73 700
1986 C10 SCLWB 6.2TD 3.73 700
1989 V20 SUB 6.2NA, 3.73 400
1994 G20 VAN 6.5NA, 3.42 60E
1994 K20LD ECSWB 6.5TD, 3.42 80E
1995 K20 SUB 6.5TD, Wrecked, ran into by stupid teen.
1995 C3500HD DRW 6.5TD, 12' Flatbed 5.13 80E
1995 C3500HD DRW 6.5TD, 18' Rollback Wrecker 4.63 80E
1994 C20HD ECLWB 6.5TD 3.73 80E Wifes Truck.
1995 C20LD ECSWB 6.5TD 3.73 80E
1995 K20LD SCLWB 6.5TD 3.73 80E
1996 K30 DRW 6.5TD 4.10 80E
1997 C10 Tahoe 2Door 2WD 5.7L to 6.5 Conversion Underway
Enthusiast
Good Day!
I've owned 5 6.2/6.5's, & my daughter's got an 89, & all have used ~ 1 qt/2000 miles. I'm not even remotely concerned about this amount of consumption.
Blessings!
82 6.2NA K15 4X4 pickup, 4spd man w/ OD, 335K+ "In Rust We Trust" (parked)
95 6.5TD 2500 4X4 pickup, Gear Vendors Aux. OD, > ¼ million miles - gone
95 6.5TD 1500 4X4 3/4T Suburban, Kennedy exhaust, > ¼ million miles
93 6.5TD 3500 4X4 1T crew cab LB pickup, 230k miles
2004 GMC 2500HD
the rig has 118k miles on it. I have not checked for blow by, so I don't know about that one.
James
Missy Good Wench ( Moderator)
OK listen up grashopper.
The little can on the right valve cover is called the CRD valve.
Basically its a PCV valve. It is connected via a hose to the turbo intake. These things get crapped up and will allow too much suck on the crankcase and will pull oil over.
Now the inside of the cold side of the turbo is always a mess on these things even when new so dont panic. If the air filter gets too dirty they will tend to suck more oil over the top too.
Replace the CDR valve and the air filter. Give it a go. If this corrects the issue all is well.
Another area is the turbo shaft seals, they can go away over time and allow far too much oil to pass and you dont see it it just blows right into the exhaust stack downstream from the engine and burns in the down pipe.
Food for thought, try the CDR and air filter first.
Best to ya
Robyn
(1) 1995 Suburban 2500 4x4
(1) 1997 Astro
(1) 2005 Suburban (Papa Smurf)
THIS IS BOW TIE COUNTRY
Enthusiast
Give the CDR a bath in diesel oil first before replacing. I clean my twice a year.
95C3500.Ext.Cab 97 Cooling mods. DSG Gear-1.95 TDCO. Bilstein Shocks. Firestone Air Bags. FSD Cooler. Banks EX System. Egt,Boost & IAT Gauges. JK High Flow/pop Injectors. Turbo-Master. Max-E 2.0. Water/Alky Injection.Amsoil Dual Bypass. Baldwin filter. aFe Air filter,
Air box & Turbo Mods. Power Service Product. Large Duels 235/85-16. Tool Box\'s & truck, 8200 lbs.
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