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Why does the engine feel weak after switching to Eagle Flag oil?

2 Answers

SanMartin

07/25/25 3:33pm

Reasons for the engine feeling weak after switching to Eagle Flag oil include incorrect oil quantity, oil-engine mismatch, clogged oil filter, and severe carbon buildup. Below are the reasons for the engine feeling weak: Incorrect oil quantity: When changing the car's oil, there is a specified standard. Adding too much oil: The crankshaft requires more effort to rotate, necessitating greater driving force, which can result in sluggish acceleration. Excessive oil can also lead to oil leaking into the combustion chamber, causing rapid oil consumption and engine carbon buildup, which harms the engine. Adding too little oil: Components do not receive sufficient lubrication, reducing power. Check the oil level with the dipstick and fill it to slightly above the middle line. This ensures proper engine lubrication without excessive pressure on the crankshaft. Oil-engine mismatch: Different engines require different oils. If acceleration feels weak after an oil change, it may be due to a mismatch. High viscosity makes crankshaft rotation difficult, while low viscosity means the engine is not suited for the oil, leading to noise. Clogged oil filter and severe carbon buildup: When changing the oil, the oil filter should usually be replaced as well. If the filter is clogged and not replaced in time, oil will bypass through the relief valve, resulting in reduced car power and increased engine wear.

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VanCooper

08/11/25 9:28pm

I just finished repairing my car, and it's quite common to experience reduced power after an oil change. There might be a few issues with the Eagle Flag oil you used: first, the viscosity of the oil you chose might be too high, such as using 40 viscosity oil in a car that requires 30, increasing internal engine friction; second, too much oil was added, exceeding the upper limit on the dipstick, increasing the resistance from crankshaft stirring; third, the oil filter wasn't replaced or wasn't installed properly, leading to oil passage blockage; or it could be an issue with the oil quality itself. Additionally, check if the air filter was overlooked during the oil change—if it's too dirty, it can affect air intake. It's recommended to first check the oil level using the dipstick, then test the idle speed. If the speed is normal but acceleration is slow, it's likely an oil issue. Lastly, keep in mind that there's usually a short adaptation period of a few hundred kilometers right after an oil change, which is normal. If the lack of power persists, take it to the repair shop immediately.

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