Sunday, February 25, 2024

Jaguar Engine Teardown Reveals The Dangers Of Overfilling Your Oil

It is always important to check and change your oil regularly. After all, it’s the lifeblood of your engine, responsible for lubricating the complex combination of metal parts that work together to produce all that power. Having too little oil can be catastrophic. But having too much oil is just as bad, as this teardown of an overfilled Jaguar engine shows.

Eric from YouTube channel I Do Cars managed to get his hands on a 3.0-liter supercharged V6 from a 2017 Jaguar XE sedan that broke down because it was seriously overfilled with oil. According to the salvage yard that sold the engine, nine quarts of oil came out of the pan during the oil change. The maximum capacity of this engine is only 5.7 liters.

Jaguar V6 engine disassembly after being overfilled with oil
Jaguar V6 engine disassembly after being overfilled with oil 2

Disassembling the heads shows signs that something is wrong. This engine has only been used for 66,000 miles, so everything looks relatively clean. But metal flakes in the oil filter and scars in the cam journals indicate catastrophic damage in the block.

Indeed, once the cylinder heads were removed, Eric noticed that the two most forward pistons were no longer correctly attached to the crankshaft. He also discovers that they have already made contact with the head, which is not supposed to happen in normal operation. Removing the oil pans reveals a ton of torn rod bearing material, including a few giant chunks. So this explains the loose pistons.

Removing the pistons reveals a pile of burnt metal at the bottom of the connecting rods and a pile of damage to the cylinder walls. When an engine is overfilled with oil, the crankshaft throws excess oil into the crankcase, turning it into foam. When this foam is sucked into the oil pump, it aerates the oil to the point where it can no longer lubricate the metal. The result is a pile of friction and heat that, if left untreated, will quickly kill an engine. And that’s exactly what happened here.

Consider the destruction of this Jaguar V6 as a sign to learn how to properly check your oil. Or you might end up with a bricked engine.

Note: The content and images used in this article is rewritten and sourced from



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