Question about 2000 Pontiac Montana

2 Answers

I have a 2000 Pontiac Montana, I have antifreeze mixing with my oil, what could be causing this and how do i fix it?

Posted by on

  • okiebelgium May 13, 2009

    i have a friend in my church who can help me do this, hopefully it wont be too expensive



2 Answers

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 5 achievements.


    An expert who has posted more than 50 answers, of which 90% or more were rated as helpful.


    An expert whose answer got voted for 20 times.

  • Expert
  • 52 Answers

Hey okiebelgium,
Hate to break the bad new to you, but when you coolant is mixing with you oil it is almost a sure thing that you have a blown head gasket. Im guessing this pontiac has higher miles, usually that is when you see something like this happened. In most cases high gaskets start leaking from abuse or lack of maintenance, not that you did either, but maybe the owned before you was very rough with it.

The fix, this is a huge job something that, if you have never replaced a head gasket before can take weeks. If you take to a dealership it is going to cost big bucks and some independent shops wont even touch a job like that.

Let me know if you have anymore questions, thanks.

Posted on May 13, 2009

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Top Expert:

    An expert who has finished #1 on the weekly Top 10 Fixya Experts Leaderboard.


    An expert that got 20 achievements.


    An expert that got 10 achievements.

  • Pontiac Master
  • 76,164 Answers

This is most likely caused leaking engine cylinder head gasket(s), this problem requires pulling the top of the engine apart, don't drive it like this (coolant in oil) or u will damage the rod and main bearings and then u will need a new engine.

Posted on May 13, 2009

  • yadayada
    yadayada May 13, 2009




1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Intermittent heat for heater

if the thermostat is good you could have the system flushed as it may be clogging up, especially if the dexcool antifreeze is old.
make sure you use only the color the vehicle has in it, do not switch from the orange to green or vice versa, be sure that dexcool is mixed properly, 50/50 ONLY otherwise it becomes corrosive.

Oct 21, 2012 | 2000 Pontiac Montana

2 Answers

Overheating pontiac montana shooting out cold air from heater

Get the radiator and heater core, hoses and thermostat replaced. Also replace the mixing valve if needed. A radiator shop could give you an estimate and diagnose the problem better than I can online. I hope sincerly that this helps.

Mar 16, 2011 | 2003 Pontiac Montana

1 Answer

How does the lower intake gasket go bad

They decay because off antifreeze breakdown. If you don't change your antifreeze yearly, there is a precipitate build up that eventually eats away the gasket & causes leakage. It is very important that this is done especially now that aluminum heads are the mainstay. In the old days every engine was 100% steel & we had a lot less problems with this issue. Aluminum & steel don't mix well with antifreeze. Good luck!

Feb 14, 2011 | 1999 Pontiac Montana

1 Answer

Leaking anti freeze. Replaced the intake gasket. Antifreeze going down but can not find a leak. No antifreeze in the oil. Someone said it could be the timing cover. But I do not see any leak. Loosing 2...

It could be the water pump. They will leak and sling the coolant so it doesn't get to the ground. You can't see the leak because it's hidden under the pulley. It's called the weap hole in the pump.

Jan 23, 2011 | 2000 Pontiac Montana

2 Answers

Hi my gmc envoy 05 i check the radaitor i see that have an what is the problem we have a leak?

There has been a problem with the Dex cool orange antifreeze deteriorating the upper and lower intake manifold gaskets, causing coolant to leak in to engine.If there is antifreeze in your oil, it will ruin your engine. If you find antifreeze in the oil it will cause the oil to become thick and frothy and will not lubricate the bearings and other moving parts, causing an engine failure. If there is evidence of coolant in the oil, do not drive the vehicle. Have it towed to a repair shop and have the gaskets replaced, oil and filter changed, cooling system flushed and refilled with GREEN antifreeze that is compatible with aluminum radiators and engine parts.

Dec 29, 2010 | 2000 GMC Envoy

1 Answer

Hello I looking for intake manofold torque for my pontiac montana 2000

remember new head bolts also, torque to yeild bolts. i would recommend to get a service manual for torque specs and procidures for removal of heads. also head gaskets are leaking for a reason have heads checked for straightness and for cracks at local machine shop, keep all pushrods and rockers numbered for reassembly, pushpods are different and will cause major engine damage if mixed up.

Dec 14, 2010 | 2000 Pontiac Montana

1 Answer

My daughter is travelling long distance on highways.Her car is at a temperature of 213F at times, is that normal? She has a pontiac 2008.GT

That's normal, that's on the high side but should drop soon as it get't that high, You can have the thermostat replaced with a lower rating but your going to have the colder running engine in the winter, Just keep an eye on the radiator fluid level and make sure the antifreeze is at a 50/50 mix (antifreeze/water). The higher the concentration of antifreeze the harder for the heat to transfer from the engine. Water is a great heat transfer but it boils over, that is why antifreeze is mixed. 100% antifreeze will gel when heated, causing poor circulation making the engine run hot, you can buy a 50/50 pre mixed antifreeze if your not in to mixing the two together and you can also buy a antifreeze meter to know what your mixture is at. Good luck and hope this helps. The other thing to is to make sure the radiator is clean and not full of dirt from the winter driving. Good luck and hope this helps. Keep me posted, be glad to answer any question you may have. 

Jul 02, 2009 | 2000 Pontiac Grand Am GT

Not finding what you are looking for?
2000 Pontiac Montana Logo

213 people viewed this question

Ask a Question

Usually answered in minutes!

Top Pontiac Experts


Level 3 Expert

76132 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22156 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

8273 Answers

Are you a Pontiac Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides