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The fifth-generation Elantra debuted at the 2010 Busan International Motor Show in April 2010. The fifth-generation Elantra (2010-2015) added a two-door coupe variant in addition to the standard four-door sedan model. These Elantra vehicles included six-speed automatic or manual transmissions.

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Knock Noise and Coolant in Oil - Advice Needed

During a cold-snap last year our car engine started knocking. No warranty left. Brought it in and the mechanic was afraid to dig into the engine because it would cost me a lot of money and potentially not fix the problem, especially considering we had no idea what the real problem was. So we’ve been driving it locally with the knock.

Then the car started stalling about every 4 months. We discovered a quick oil change kept it running like normal. I figured something was contaminating the oil because of the knock but that was just my guess. Perhaps metal shavings?

On our most recent oil change the mechanic noticed coolant in the oil. Probably a blown head gasket. He said it’s $1500 to replace (if that’s actually what’s wrong) but there’s a chance that there’s irreparable damage (considering we’ve been driving it with a knock, and it’s been stalling, for at least a year now…). He also said he ‘thinks’ the knocking noise is a rocker knock and unfixable. Do these things have anything in common? Or are those most likely completely separate occurrences?

We just paid the car off last month and really want to keep it, especially since we are short on cash and are trying to save up down a down payment on a house. Do I take the risk and pay the $1500 to replace the blown head gasket in hopes that it will last us at least another year? Or do you think this is silly and I should just trade it in somewhere while I still can and then take on another car loan?

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Knocking is generally bad news - the engine is likely destroyed because you didn’t attend to it until it was too late. OUCH :-(. The coolant dilutes the oil, which ruins the block, piston rings and often the pistons.

The head gasket fix may work, but it will not cure the knocking if it’s an issue inside the engine - get the engine inspected before you do any repairs and find it’s destroyed. Any damage present is likely catastrophic.

If the engine was ruined, you will need to rebuild it - which will likely be about as much as a newer version of the Elantra from ~2015 or so to do it properly. Don’t spend that kind of money on it if you can get a newer car for about as much as the rebuild.

If you’re trying to keep repair costs low, put a used engine in with similar or lower mileage if you want to save the money for a downpayment if it’s beyond repair, but keep in mind Hyundai cars are known to start falling apart at 100k miles in your decision. However, the parts are cheap enough if you can get a engine for 25% of what it’s worth, it may be worth considering. Finding an engine won’t be hard, since you can find these in junkyards all day, and parts cars tend to be cheap.

The other option is a similar/newer one you pay cash for if you’d rather move on from this.

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Thank you Nick!

I don't know a lot about this stuff and your thoughts/advice is truly appreciated.

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