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5w30 Guzzler
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I'm demonstrating how to change oil for a speech and I need to know everything that can go wrong with an engine if you dont change its oil.
Can I get some help?
 

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the detergents wear out and wont protect
 

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oil shearing down to a thinner grade:
for ex., a 10w-40 might shear down to a 10-30 weight in 3000 or more miles, thus losing viscosity(thickness) and the ability to protect.
Main causes of shearing down: high temps and friction.

As someone already stated, additive and detergent package will deteriorate over time/use---> no protection/correct thickness.

Also: an oil can get thicker than the starting viscosity by not getting warm enough(short trips), collecting moisture, and this turning in to sludge(for ex. a 5w-30 will have a X-40 thickness)

also: not changing--->consumption continues--->no oil at some point-->engine melts:)
 

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I had a customer in a dodge power wagon that never changed his oil. It leaked enough that he would ad more. For at least the six or seven years I new him. He expired before the truck did.
 
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