I use 6 to 6.5 litres in my 2800 (non-turbo) engine. Six litres is safe.
The loud noise: Careful please. I have had a big-end (the bottom of a connecting rod) come off while driving - Of course you loose one cyllinder's power and the noise is very bad. Also damages the crank shaft. If the noise does not go away by adjusting the oil level, have the engine checked immediately.
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www.cargurus.com > Questions > Chevrolet > Cavalier
CarGurusDec 19, 2012 - And while driving loud thump when car motor shifts th... ... Bad throttle position sensor can trip both lights and make the transmission shift at high rpms and shift hard even under light acceleration. .... the transmission will shift hard when firstput into reverse or drive ... 2004 Chevrolet Cavalier LS For Sale.Missing: mitsubishi eclipse
Hi Janay, It would not take a good mechanic more than lifting the hood and listening to the engine to determine that the engine had knocked. By all means have someone else have a listen and a look and wait to hear the diagnosis they give. It's always a good idea to have a vehicle serviced on a regular basis. If you needed to add oil, to have the sound of the engine change, It sounds like you didn't bother? If the engine knocks more when you apply gas it seems to me that the connecting rod bearings and the small end bearing have both been damaged by the lack of lubricant (Engine oil). If you like the vehicle replace the engine, if not replace the vehicle. Regards John
Sounds like a hydralic lifter issue.
These lifters operate the cylinder valves and run off oil pressure. When the engine is cold and the oil is thick worn lifters tend to rattle. When the engine warms up, everything expands and the lifters stop rattling.
There is no easy cure for this except replacing the lifters.
The engine is probably making a knocking sound because the oil needs to be changed or replaced. The check engine light is indicating that you will need regular dealership servicing soon, however you can still drive the vehicle but depending on mileage it will determine what services are required.