Where does the oil leak come from on a GMC Truck?

It CANNOT go up. OP said leak *appears* to be coming from above the rear main seal, which *could* rule out the oil pan. However, rear main seal or oil pan gasket or both could be failing. Though as mentioned in another post, it could be coming from the oil pressure sensor.

Is there an oil leak on my Silverado?

I have a 2004 6.0L Silverado that I have recently had a lot of work done on. Let me start this story off by saying I have faith in my shop, the service writer is a personal friend of mine, and the two mechanics there are both master ASE cert. each who have been wrenching for 20+ years.

When did my Vortec 6000 have an oil leak?

I had a nasty oil leak about 6 months ago that turned out to be the rear main seal. That was fixed, and I also replaced the oil cooler lines, and oil pan gasket during the time it was in the shop. Now here is where it gets funny. Since then I have had a small oil leak in the oil pan gasket, confirmed with dye multiple times.

When was the last time I had an oil leak?

That being said, we are in a predicament. I had a nasty oil leak about 6 months ago that turned out to be the rear main seal. That was fixed, and I also replaced the oil cooler lines, and oil pan gasket during the time it was in the shop.

Where does the oil leak come from on a GM 5L?

If the leak has been diagnosed as coming from the engine rear cover assembly, refer to Engine Rear Cover Replacement in SI and remove the engine rear cover assembly. Inspect the engine block and engine rear cover for porosity on the mating surfaces.

What to do about rear engine oil leak?

Inspect the engine block and engine rear cover for porosity on the mating surfaces. If porosity is found on the engine rear cover (see illustration below), replace the engine rear cover assembly, GM P/N 12633579.

What to do if your oil pan gasket is leaking?

The oil leaks by the gasket and runs down the side of the cover, and may appear to be a leak at the t-joint area of the cover. The fix is to replace the cover with GM P/N 12633579. Also, if porosity is found anywhere on the sealing surface of the engine block, use the following procedure to apply RTV to repair the engine block porosity.

What happens if your GMC Sierra has low oil pressure?

One of the most serious issues that can happen to your GMC Sierra ‘s engine is if it ends up with low oil pressure. Low oil pressure will cause the engine to seize up. When the oil pressure light on, it should be assumed that the engine locking up is imminent. We advise not running the engine until the issue can be properly diagnosed.

Can a high oil pressure cause an oil leak?

Another symptom of high oil pressure is oil leaks around the engine. High oil pressure can also cause high crankcase pressure which could cause your engine to start to leak oil through the gaskets. On some cars, the oil pressure light will flash on your dashboard if the pressure get’s too high!

How can I tell if oil pressure is low in my car?

Step 1 – To verify the engine oil pressure is low, start the engine (cold) and observe the gauge or light. Step 2 – Using the engine oil dip stick, check the oil level of the engine and ensure a proper level.

Can a blown head gasket cause coolant to leak?

If the head gasket fails, coolant, and engine oil may mix. You may also notice that coolant is leaking from the bottom of the engine and dripping onto the ground. Either way, a blown head gasket can be disastrous for your engine.

Can a damaged head gasket cause an oil leak?

Damaged Head Gasket: A damaged head gasket with holes can cause the oil to leak into the transmission system. If such is the case, inspect your gasket and have it replaced to fix the issue. 8. Main Seal The main seal is responsible for preventing the oil to escape from the front of the crankshaft as the car is moving.

What causes an oil leak in an engine?

An engine gasket is a seal that ensures that lubricants do not leak. When there is a break in the gasket, you will begin to lose vehicle fluids. In most cases, you will leak motor oil. The other less common causes of oil leaks are an oil pan leak, oil seals, or bad connections.

Can a high mileage oil sealant stop a leak?

Sealants do not have the ability to stop large leaks if the gasket or seal has a outsized hole, gap or breakage. In these cases, the seal must be replaced. While these additives have not been shown to cause harm to an engine, a better option may be to use “high-mileage’’ oil.

What happens when you have an oil pan gasket leak?

You should see the liquid actively leaking out of the vehicle and forming a big puddle on the ground. If oil is leaking out of your vehicle, then your engine will not receive enough oil to lubricate and cool down its components. This will cause your engine to overheat because of all the moving components that rub together and generate intense heat.

How to fix a leaking oil seal in your car?

Oil seal leak. How to fix a oil seal leak in your car DIY with Scotty Kilmer. How you can quickly fix leaking oil seals by using a little bottle of sealer. Fixing an leaking oil seal in your car is easier than you might think. DIY car repair with Scotty Kilmer, an auto mechanic for the last 42 years. 1. Bluetooth Scan Tool: http://amzn.to/2nfvmaD

Where is the oil leak on a 5.3?

On the 5.3 there are a couple of common places for leaks. The oil pan towards the middle of the engine. The rear main also is a common leak. There is also a small cover plate on the back of the engine. On the drivers side in the back the is a small two bolt cover that can Leak.

What causes an oil leak in a Silverado Sierra?

Just got done crawling around under the truck, very difficult to tell what is exactly leaking. Could be blockoff plate, could be filter, could be oil pan gasket. The pan gasket is the most likely culprit in my eyes as there is oil near the gasket in more than one place.

What to do if you have an oil pan leak in your Chevy Tahoe?

If the leak has been diagnosed as coming from the engine rear cover assembly, refer to Engine Rear Cover Replacement in SI and remove the engine rear cover assembly. Inspect for engine block porosity where the engine rear cover mates to the engine block.

What to do if your GMC Truck has an oil leak?

Oil always travels down and in the direction the fan blows so I’d look toward the front and see if you see any signs of possibly the front crank seal leaking. It looks like possibly something higher than the pan and/or further forward. First off I’d clean up the whole area really well. Crawling under and wiping down everything.

Why does my Vortec 5300 have an oil leak?

A very common culprit in that oil is the oiler cooler connection or block off plate if you don’t have the cooler. It’s above the filter. I had to put a new gasket in mine. I will check that, thanks for the reply. I am actually not sure if I have an oil cooler or not. Now is as good a time as any to find out.

Why is the intake gasket on my Vortec cracking?

On the 5.3L vortec, the intake manifold is made out of plastic, and the gasket was poorly designed. Due to its plastic material, the manifold itself is prone to cracking either from it being overtorqued, or simply from natural wear and tear as it operates in a high-heat environment.