2018 - TDP's 22nd Anniversary
What's New: | Feature Articles: | Product Reviews: | Member's Area: | Subscribe:
Duramax 6600 Diesel Page | Advertiser's Section | Classified Ads | Photo Album | Diesel Books, GM Licensed T-shirts

Go Back Forums > The Diesel Page Member Forums > 6.5L Turbo Diesel
Register FAQ Members List Photo Album Mark Forums Read

6.5L Turbo Diesel 1992-00 6.5TD - Discussion forum for the 6.5L engine.

Thread Tools Display Modes
Old 07-09-2013, 05:55 PM
lars1 lars1 is offline
Join Date: Sep 2001
Posts: 16
Default Coolant in Oil?

I believe have another issue and welcome input. Our 1994 K2500 Suburban with about 150K miles had too much fluid in the oil pan (about 1-quart over the full line) and started to blow white smoke. The coolant was low and the car alarmed. It had sat for about 6-months when all of this was realized.

What to do considering coolant in the oil? The dealership "guessed" a failed head gasket and quoted $2,300 repair. What about internal damage due to the coolant?

The vehicle is good shape. I planning to loan it out as a school car for my son who just graduated.

Thanks in advance.
Reply With Quote
Old 07-09-2013, 07:50 PM
john8662's Avatar
john8662 john8662 is offline
Join Date: Sep 2001
Location: Lubbock TX, USA
Posts: 4,193

Sounds like a head gasket with the accompanied white smoke.

Usually not a biggie on a little coolant in the oil, fix the headgasket, drain oil, refill, shake it down. See how it goes.

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
Reply With Quote
Old 07-09-2013, 07:53 PM
joeq's Avatar
joeq joeq is offline
Running on M/T
Join Date: Jun 2013
Location: Northern Ct
Posts: 224

X2 from above. I think that $2300 for a head gasket is a little extreme tho.
Even for both being changed.
Old habits, die hard.
Reply With Quote
Old 07-09-2013, 08:16 PM
Dvldog8793 Dvldog8793 is offline
Join Date: Feb 2003
Location: Grand Rapids MN 55744
Posts: 1,631

What type of antifreeze is in it? The orange stuff will actually mix with oil and form a goop that will stick to the inside of everything. if you don't get rid of it, it will eat your bearings. I would change the gaskets, refill, run it to op temp and then use an oil flush product and change the oil again then change that oil out after about 3-500 miles. Might be overkill but oil is cheap and bearings are expensive. If it was mine I would do that no mater what type antifreeze it was but for sure with the orange stuff.
Good luck
Hope this helps
1996 Chvy 3500 CCDWLB 6.5 Heathed, NO vac, marine injctrs, ARB bumper, BIG pipe, 3" lift, bright lights, bypass oil system.
1986 Chvy 6.2 M1009 blazer RAM AIR, Headers, Custom interior
2001 Chinook RV, V10 gas
1974 John Deere 1530 diesel tractor
1993 John Deere 455 Diesel lawn mower
1967 GTO, 1989 Honda Transalp
2009 VW Jetta TDI, flashed and piped, 6speed, fun car!
1998 6.5 suburban, stock, daughter's
1993 6.5 3500 CCSWLB GM8, Heathed, big exhaust, gauges, Son's

1984 6.2 ATS turbo 3500, SCDWLB - Son's
3 kids, 1 wife, 1 dog
Gunsmith, Tactics Instructor, Fabricator USMC 87-93 Semper Fi!
Reply With Quote
Old 07-10-2013, 12:56 PM
rustyk's Avatar
rustyk rustyk is offline
Captain Doom
Join Date: Sep 2006
Location: Brooker, FL
Posts: 1,211

Dvldog is right - but ANY ethylene glycol will cause sludge.

I would flush the cooling system to completely remove the ethylene glycol. Then change the oil/filter and run the engine for a few minutes with the radiator cap off to flush the crud out, then change the oil/filter again, and run the engine again for a few minutes.
'94 Barth 28' Breakaway M/H ("StaRV II") diesel pusher: Spartan chassis, aluminum birdcage construction. Peninsular/AMG 6.5L TD (230HP), 18:1, Phazer, non-wastgated turbo, hi-pop injectors, 4L80E (Sun Coast TC & rebuild, M-H Pan), Dana 80 (M-H Cover), Fluidampr, EGT, trans temp, boost gage. Honda EV-4010 gaso genset, furnace, roof air, stove, microwave/convection, 2-dr. 3-way reefer. KVH R5SL Satellite. Cruises 2, sleeps 4, carries 6, and parties 8 (parties 12 - tested).

Stand-ins are an '02 Cadillac Escalade AWD 6.0L and an '06 Toyota Sienna Limited.
Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

All times are GMT -7. The time now is 04:01 PM.

Powered by vBulletin® Version 3.8.2
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Copyright 1996-2018 by - All Rights Reserved