Hey guys, I bought a 2007 Sonata 2.4l I4, August of last year at 192,600km. After my first oil change with 10w-30 Castrol High Mileage and a Fram filter, an irregular noise started occurring. I tried oil thickners (recommended by mechanic) didn't help, ended up seafoaming the crankcase and switching to Mobil 1 5w-30. The noise got worse, I tried some researching and discovered that there is a TSB on aftermarket filters, tried the OEM Hyundai filter and noise stayed the same. On the next oil change I tried a 5w40 oil (owners manual allows from 5w-20 to 10w-30). Noise got even worse (notice the trend every oil change?) I poured in some engine restore and it quieted it down 100%, the noise started slowly emerging back but never as bad as before. Oil change after that I did a Mobil 1 5w30 oil change with engine restore and again noise completely vanished, it just now started slowly emerging. The car has 206,xxx KM on it right now so its been driving for quite some distance with the noise with no issues, car has also been pushed a few times and it takes it well. I have a couple of youtube videos to show you guys, first 2 are mine, they show how bad the noise was before engine restore, the last one is not mine but it shows the noise how it is after engine restore wears off, however, my engine is not as loud, same exact noise however. His engine also started making noise after an oil change.
If anyone can chime in as to what it is to finally rest my mind I'd greatly appreciate it.
If anyone can chime in as to what it is to finally rest my mind I'd greatly appreciate it.