Porsche 928: Why is My Car Leaking Oil?
Your Porsche 928 can be leaking for a multitude of reasons. This article covers the most common reasons.
This article applies to the Porsche 928 (1979-1995).
In general, cars are bound to eventually leak. In this case since we're talking about the Porsche 928, which is certainly bound to start leaking due to its age. Some of these fixes can be done DIY-style, while others are best left to your trusty mechanic. The most common issues causing your 928 to leak are bad/old gaskets. This article covers which gaskets to check when you discover an oil leak.
Step 1 – Check the oil pan gasket
Check your oil pan gasket. This is a common oil leak area. If you replace this gasket, make sure not to over-torque the small bolts. Over-torquing these bolts can cause the gasket to not seal properly. Another solution can be to use Hondabond-type products. Often referred to as gaskets in a tube, these work great for those of you consistently having problems with your oil pan gasket.
Pro Tip
You should change the oil to make sure the leak isn't coming from the oil filter or the oil pan drain plug gasket.
(Related Article: Porsche 928: How to Change Your Oil - Rennlist.com)
If your oil pan gasket is not the problem, try the next step.
Step 2 – Check the head gasket
Check out your head gasket. The head gasket is the seal between the head and block of the engine, secured with bolts. If your vehicle has ever overheated, the head gasket is a likely source of a leak. This is another area where leaks can occur with age. You should clean the area around your head gasket. Take the car out for a drive and then check under the hood to see if you notice oil in the areas you just cleaned.
Pro Tip
A bad head gasket can cause other problems such as smoking, misfire, rough idle, and water in oil.
If your head gasket is good, try the next step.
Step 3 – Check the valve cover gasket
Check your valve cover gasket. This gasket will eventually leak with age. When replacing this gasket, be sure not to over-tighten the cam bolts. The gasket itself is fairly cheap. If you are having problems with constant leaks in this area, you can also use a little Hondabond.
Pro Tip
This job can be done by yourself in a few hours, although it can get tedious.
Step 4 – Check the oil pressure sending unit gasket
The oil pressure sending unit screws into place with a gasket that is supposed to prevent leaks. You can try to tighten it back up and see if that stops the leak. If the leak continues, then you probably need a gasket replacement.
Pro Tip
Again, clean off the area and check back for the oil leak. This is the easiest way to pin point leaks.
Related Discussions
- Leak Discussion - Rennlist.com
- Oil Pan Leak Discussion - Rennlist.com
- Good Head Gasket Discussion - Rennlist.com
