Being owner of a vehicle is necessary, we most of the time need it to get to work and for a majority of our daily trips. This crucial part of our annual budget recurrently causes us complications, being conscious of oil leaking on your car is one of them… In truth, an oil leak is almost never benign and can quickly lead to the breakage of your engine if you don’t realize it. If you are conscious of oil leaking on your GMC Sierra, you have come to the right place, we will first help you to uncover the cause of the oil leak and, secondly, we will help you to remedy it, if possible.


Identifying the origin of the oil leaking on your GMC Sierra

If you find out fluid leaking from under your GMC Sierra, the first right move is to check all of your levels (power steering, engine oil, brake fluid, coolant) to find out if any of them can fairly quickly be identified as the origin of the leak. To limit the risks, it is really required to check your levels every 2 weeks to avoid any risk of engine breakage.
In our circumstance we will only be focused on circumstance you find oil leaking from your GMC Sierra, as far as engine oil is concerned, the liquid will be quite viscous and in shades of brown to black and if it is gearbox oil, it will be rather in amber tones and will have a strong uneasy smell.
It’s not constantly easy to uncover the cause of the oil that leaks on a GMC Sierra because of the room in the engine block, nevertheless here are the steps to follow to uncover the origin of the oil:

  • Locate the point where the oil falls, the spot from which it spills onto the floor…
  • Go back up the route of the dripping oil to its start, if the blot is too important, don’t think twice to clean the engine block and drive to be capable of find out it more quickly.
  • To help you, here is a list of the parts that most often trigger oil to leak from a car: the drain plug and its seal; one of your crankcase gaskets; the oil pressure switch; the oil filter; the transmission drain plug; the transmission sealing rings.

Whenever possible, fix the part that caused the oil to leak on your GMC Sierra.

Now that you’ve found the cause of the oil leaking, it’s time to get down to business. Of course, for a while, you’ll be able to add more oil to top up the level, dependant upon its seriousness, but be aware that this is not a long lasting answer and that the leak could get worse at every time. We are going to demonstrate you the repairs that we think you can carry out all alone with some expertise, tools and depending to the accessibility that you are going to have on your engine. Whatever the case, you should know that after repairing an oil leak on a GMC Sierra, you will have to change your engine or gearbox oil.

Oil leakage from the drain plug and its seal on GMC Sierra

In this situation, the technique is fairly simple, you just have to lift your GMC Sierra, if possible totally horizontal, remove your drain plug, drain your engine oil, change your drain gasket, tighten the plug to the appropriate torque and check the hot engine to make sure the leak has been repaired.

Oil leaking over from the oil filter of my GMC Sierra

In the event that your oil leak comes from your oil filter, you will basically need to replace it. To do this, take a filter wrench, remove the old filter, ensuring that the gasket does not stick to the engine, set the new filter and tighten it moderately. Same check, hot check if oil is leaking from your GMC Sierra.

Oil leaking from the pressure switch of my GMC Sierra

Finally, if it is your pressure switch that is the cause of your leak on your GMC Sierra, you can, determined by its accessibility, reach it and change it easily. To achieve this, set a drain tray under the part, disconnect the electrical wire, remove the part, quickly reposition the replacement pressure switch, clean the whole thing and do a hot check to make sure that you no longer have any oil leaking from your GMC Sierra.

For any other type of leak, we recommend you to go to your auto technician because the repair will involve too much expertise and tools to be performed serenely alone.

To discover more tips on the GMC Sierra, take a look at the GMC Sierra category.