Skip the auto shop - Our mechanics make house calls

Q: Engine rod knock

asked by on

Trading my car at the dealership & they inspected my car & gave me the value. Next day before I go to trade in my car I turn my engine on and hear a loud rod knocking. Called the dealership and explained the problem. They said since they already inspected my car, to just bring it to them and they will repair the engine. But in order for me to get to the dealership they said to use a thick oil in the engine to temporarily stop the loud knocking. What's the best oil to use for my Chrysler 300 for the rod knock? And how many quarts do I need? Thanks in advance!!

My car has 89000 miles.

Hello and thank you for contacting YourMechanic. The oil to use is a thick 15/40W oil for diesels. This oil is thicker than normal engine oil and can keep an engine from knocking for a little while. If the engine continues to knock after putting the oil in, I suggest not driving your vehicle to the dealership. If the dealership will take your vehicle in for trade, they will do anything to get your vehicle to them, even if it requires a tow. I recommend having a professional, preferably a professional from YourMechanic, to come to where you are and check out the knock in your engine.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: All of the dash lights and gauges flash, and then the car dies

Have the main integrated fuse relay box checked for connection issues. The fuse box on these vehicle have been known to cause stalling issues along with other erratic electrical issues. Contact a dealer to see if your vehicle may have...

Q: Car leaks power steering fluid

There are many hose/line connections involved in the power steering system that can be possible leak points. The power steering pump and steering gear (rack and pinion) are major components and common failure items on your vehicle. Have an experienced...

Q: Car began knocking after an oil change, then exploded blowing 2 holes in the side and the oil pan off

It may be hard to figure out why the engine failed without knowing if the oil leaked out or was not filled up. I have seen situations where after performing an oil change the oil leaked out from an oil...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.