Will synthetic oil cause oil leaks?

What are seals?

Seals often take the form of rings or gaskets, which join two surfaces together and must create an effective fluid barrier over long periods of time under extreme changes in pressure and temperature.

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Most motorists don&#;t think about seals until they notice a fluid leak. Common seal locations include valve covers, crankshaft, transmission output shaft and axles. Vehicles contain many different seals, which are responsible for:

• Retaining fluids within the system
• Keeping contaminants out
• Keeping different fluids separated
• Confining pressure

When synthetic lubricants were first introduced, many people erroneously believed the oils were too slippery and leaked past seals. However, field studies and real-world use by countless motorists has proven otherwise.

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A more common scenario is that switching to synthetic lubricants will clean internal components, washing away existing sludge and other contaminants, which could potentially be plugging leaky seals. Using synthetic lubricants from the start keeps internals cleaner and helps seals last longer.

Post by desmotesta » Mar 09, 9:34 AM

Hello everyone

I hate to start an oil thread, been on the so called "forums" for 20 years and i know how the oil debate usually goes...

So here is my question, my car (88' 528E) has a little over 300K.

Last month I cleaned the engine bay, which had not been cleaned in years, and did not notice any significant seepage around the valve cover area.

On the same day, I did an oil change and decided to use Castrol High mileage Synthetic Blend 20w-50.

Within a day or two, I found the engine noises (valve ticking specifically) to be louder and now, a month later I see mild seepage around the valve cover gasket.

I had heard this "urban legend" that synthetic oil can cause oil leaks on very old engines, and since I had never owned a 28 yr old 300K+ mile car before, I never really confirmed the myth.

Can someone confirm this myth for me? Is my seep due to my poor choice of oil or just bad timing?

I plan on going back to regular dino oil this weekend just to see of the valves go back to their usual sound.

Thank you in advance for your input

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