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Saab 900 Oil Filler Cap

Signs and Symptoms of a Faulty Saab 900 Oil Filler Cap

Your Saab 900 oil filler cap keeps your engine oil from getting contaminated and from leaking out of the engine oil tank. However, constant exposure to heat and extreme pressure can wear this component out and keep it from doing its job properly. Avoid the hassle of a faulty oil filler cap by taking note of these common problems:

Sludge under the oil filler cap

Differently colored deposits on the underside of the oil filler cap can point to several problems. The most common deposit, a white, creamy sludge, is caused by the mixture of water and engine oil. In some cases, water droplets can build up on the underside of your oil filler cap signaling that moisture is still entering your engine oil tank but has not yet mixed with your engine oil. On rare occasions, a brownish or tar-like substance can also accumulate beneath your oil filler cap due to a coolant leak. Most of these cases point to a worn-out, improperly fitted, or defective oil filler cap, but it would also be advisable to examine any related components that might be causing moisture to enter your oil filler cap.

Cracked or loose oil filler cap

If you notice puddles or drops of engine oil on and around your oil filler cap, then you probably have a cracked or loosely fitted oil filler cap. This problem can cause your engine oil to spill out of its tank resulting in low engine oil level and eventual overheating of your engine. Inspect your oil filler cap carefully and see if it is cracked or if you can't tighten it properly anymore; these cases will definitely call for an oil filler cap replacement.

Other common oil filler cap issues

Sometimes, your oil filler cap might seem clean with no signs of an engine oil leak around it, but you will notice some air or smoke spitting from your oil filler cap. This can also be caused by an improperly fitted oil filler cap, or in some cases, a worn-out O-ring. A visual inspection can easily tell you if the O-ring in your engine oil tank is too worn out to function properly. When looking for a replacement, remember to choose a good heat-resistant O-ring.

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  • Keeping Your Saab 900 Oil Filler Cap in Prime Condition 27 February 2013

    Extreme pressure inside your engine oil tank, exposure to heat and vibration, and improper maintenance-all these can lead to a battered and bruised oil filler cap. With a worn-out oil filler cap, your engine is so much more prone to failure. Avoid the risk of engine oil leaks and keep your oil filler cap in good shape by following these tips:


    Don't let moisture enter your engine oil tank.


    One of the main reasons of deposits beneath your oil filler cap is water mixing with your engine oil, so make sure that you avoid this situation as much as possible. Always check your engine bay for a blown head gasket, worn seals, and leaky fittings and repair or replace the damaged components as soon as possible.


    Take care of the oil filler cap's O-ring seal.


    The O-ring seal or gasket in your oil filler cap helps make sure that nothing escapes or enters your oil filler cap, so always examine it for signs of wear and tear. Be sure that you don't tighten your oil filler cap too much since doing so can damage the O-ring seal as well. You can replace a damaged oil filler cap O-ring, but it would probably be easier and more cost-efficient to just replace the oil filler cap itself.


    Clean your engine using low-pressure water spray.


    Keeping your engine bay clean is needed to extend the life of your Saab 900's powertrain. However, using a high-pressure hose to spray water on your engine bay can actually cause water to penetrate various seals and fittings-including your oil filler cap. To avoid this, use a low-pressure hose and lots of rags to clean your engine instead.


    Opt for a sturdier oil filler cap.


    If your plastic oil filler cap just can't handle the pressure inside your engine oil tank, then switch to a metal oil filler cap instead. Choose one that is stainless steel or chrome plated to make sure that it won't rust too easily.


    Habitually examine your oil filler cap for any damage.


    Even the tiniest crack on your oil filler cap can cause unwanted moisture to enter your engine oil tank and mix with your engine oil, so make it a point to visually inspect your oil filler cap as often as you can.