04 Reasons You Should Not Use Thicker Oil with High Mileage Cars

Thicker oils don't guarantee better performance but increased engine resistance; here's why.

01 - Thicker Oils Are Highly Viscose

They don't flow easily throughout the engine to lubricate compact spaces and cause the engine to pump them with more pressure.

02 - Thicker Oils Reduce Fuel Economy

Because the engine pumps them with more power, it consumes more fuel, reducing the mileage and increasing the frequency of your fill-ups.

03 - Thicker Oils Aren’t Ideal for Freezing Temperatures

Thicker oils become frosty under glacial weather conditions, which may cause your already old engine to fail to an even worse extent.

04 - Thicker Oils Do More Harm Than Good

If your engine is compatible with 5w20 and you pour a 5w30 in it, you are causing it to work and wear out more, leading to more damage.

Should You Use Thicker Oils?

Thicker oils may buy you a bit of time with your high mileage engine, but that time won't end in its favor unless you're pouring compatible—no matter thinner engine oils.



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