Tramny Fluid in Oil

Asked by Dec 29, 2016 at 06:36 PM about the 2003 Chevrolet S-10 4 Dr LS 4WD Crew Cab SB

Question type: Maintenance & Repair

I have a 2003 ZR5 4X4 S10.Just recently installed
new aluminum radiator, electric fans, and auxiliary
coolers for tranny and oil. All hoses are hooked up
right, trust me I'm not an idiot. I've been losing
tranny fluid and my oil is going up. Putting two an
two together I'm leaking fluid into my oil. The
mystery is how? I've tried eliminating all
possibilities. Anyone has info, besides the whole I
hooked up the wrong hoses, I'm not dumb, please
help.

5 Answers

73,125

Well then what is different? The new radiator, correct? Is it possible there are some leaks in the oil cooling tanks? May need to get tested?

7,175

The only other explanation is a hole in the cooler. Since transmission has higher pressure, it leaks in the oil cooling chamber

50,855

...or something hooked up so that the fluids mix.

98,565

There were a few of these that has an oil cooler that ran coolant though it, thet were located back above the oil filter assembly and had coolant lines in and out, that might be your problem, if you have one. Is the replacement radiator just for the engine coolant or does it also have fittings for a transmission cooler inside? If it does don't use them, run the tranny lines right to the auxiliary cooler.

19,055

If the oil cooler and trans cooler on the radiator are on 2 different sides then it's not possible for them tk do this. Most coolers in radiators are just tanks that sit in coolant. Now coolant contamination is possible but there is no where naturally that transmission fluid can get into your oil. And I've never seen coolant ran to the oil filter adapter, that is however where the oil cooler lines are that flow oil to and from the oil cooler in the radiator, certainly not coolant.

Your Answer

S-10

Looking for a Used S-10 in your area?

CarGurus has 1,265 nationwide S-10 listings starting at $1,800.

ZIP:

Chevrolet S-10 Experts

  • #1
    Andrew Olsen
    Reputation
    2,370
  • #2
    Trebor66
    Reputation
    1,030
  • #3
    John Saffrahn
    Reputation
    1,000
View All

Related Models For Sale

Used Ford Ranger
169 Great Deals out of 5,505 listings starting at $1,000
Used Chevrolet Colorado
257 Great Deals out of 29,637 listings starting at $1,950
Used Chevrolet Silverado 1500
2,153 Great Deals out of 181,075 listings starting at $1,900
Used GMC Sonoma
6 Great Deals out of 437 listings starting at $1,900
Used Toyota Tacoma
591 Great Deals out of 41,802 listings starting at $2,995
Used Ford F-150
2,155 Great Deals out of 181,742 listings starting at $1,000
Used Dodge Dakota
120 Great Deals out of 3,651 listings starting at $1,650
Used Chevrolet Blazer
3 Great Deals out of 1,143 listings starting at $950
Used Nissan Frontier
328 Great Deals out of 20,904 listings starting at $1,995
Used GMC Sierra 1500
796 Great Deals out of 67,452 listings starting at $1,350
Used GMC Canyon
125 Great Deals out of 12,439 listings starting at $3,299
Used Dodge Ram 1500
396 Great Deals out of 10,701 listings starting at $1,500
Used Chevrolet Camaro
419 Great Deals out of 31,629 listings starting at $2,395
Used Toyota Tundra
431 Great Deals out of 33,516 listings starting at $1,999

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.