What are the effects of oil with too high viscosity?

[LeJohnny]

The effects of oil with too high viscosity include: 1. Difficult cold starts for the vehicle, as high oil viscosity combined with low ambient temperatures results in slow oil circulation, poor lubrication, and increased engine component wear; 2. Higher oil viscosity leads to slower circulation within the engine and fewer passes through the filter, resulting in poor cleaning performance; 3. High oil viscosity reduces fluidity, thereby diminishing cooling effectiveness; 4. Increased oil viscosity raises friction between engine components, leading to greater wear and power loss, which reduces the engine's effective output.

[DiBrantley]

I once used high-viscosity engine oil, and it caused a bunch of problems for my car. It was winter, and I switched to an oil that claimed to be heat-resistant, but the engine had extreme difficulty starting, almost killing the battery. A mechanic friend explained that the excessive viscosity caused poor flow, leading to insufficient lubrication in cold temperatures and increased engine wear. Fuel consumption also skyrocketed—I calculated an extra liter per 100 kilometers, which added up to significant losses over a year. The engine noise also became louder, with annoying squeaks while driving. Later, I checked the manual and switched to the appropriate viscosity oil, and everything returned to normal. Remember, choosing engine oil depends on the season and your car's specifications—don't mess around with it.

[MacJade]

Excessively thick engine oil significantly impacts fuel economy. I've observed that high-viscosity oils cause a sharp increase in fuel consumption—not only burning more fuel during daily driving but also straining my budget over time. The increased internal engine resistance places greater load on components, leading to premature wear (a replacement oil pump alone costs nearly a thousand). It may also shorten engine lifespan, with overhaul expenses running even higher. During summer, poor heat dissipation requires careful oil temperature management. Ultimately, selecting the correct oil saves both money and hassle—adhering to OEM specifications is crucial. I now conduct regular inspections to prevent waste.

[MacAlessandra]

High-viscosity engine oil has poor fluidity, especially during cold starts, making it difficult to lubricate in time, thereby increasing the risk of engine wear. During normal driving, the engine requires more horsepower to push the oil, leading to increased fuel consumption and emissions. Over time, this can harm engine health. I personally experienced higher oil temperatures and increased noise. It is recommended to refer to the manual when selecting oil to maintain smooth operation and protect components. Don’t overlook simple things, or the cost could be significant.

[VonBrianna]

From a safety perspective, high-viscosity engine oil poses multiple hazards. I've experienced engine failure to start in severe winter, nearly causing a roadside breakdown—significant risks indeed. Insufficient lubrication increases friction, potentially leading to overheating or even fire hazards. During short-distance driving, heightened vibrations compromise handling. Always consult your vehicle manual for recommended viscosity grades and adhere to scheduled maintenance to ensure reliable operation—life is precious, never compromise on this.

[RebeccaMarie]

Some people mistakenly believe that high-viscosity engine oil provides better engine protection, but in reality, it can cause significant harm. I personally experienced severe consequences: increased fuel consumption, louder noise, and reduced performance. Modern engines are precision-engineered and require specific viscosity matching. High viscosity actually increases internal resistance, slows down cold starts, and can damage components. Stop clinging to outdated beliefs—always follow the manufacturer's manual when selecting oil to avoid wasted investment and properly protect your car.