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I was just wondering if this noise is supposed to happen when starting up my Kia Optima after it has sat all night? I just bought this car 2 days ago. There seems to be a slight rattle for maybe 2-3 seconds when I first start my car. Anybody else's does this?
 

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13 Ebony SXL Turbo Touring & Tech Pkgs: Original Everything 195K Drag wheels
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My '13 SXL 'rattles' for about 1 second sometimes on an overnight start. Odd it does not do it everytime. Its a little noisier than once warmed up (about 30 seconds later when idles drops to 1K). I think it is normal for these engines. Luck.
 

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2012 Black SX Prem. & Tech.
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That rattle might be the cam chain tensioner, where it needs a little help from the oil pressure build up after starting, before the tensioner is able to stop the chain from rattling.

I've always used the OEM oil filter, so it's very rare that I hear that start up rattle, but I've heard it maybe three times total in the last 7 years.
 

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13 Ebony SXL Turbo Touring & Tech Pkgs: Original Everything 195K Drag wheels
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440 Posts
I've used Purolator Boss filters, the OEMs are so tiny, my riding mower has a larger one, haha. I'll try oem next time just for grins test.
 

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I use an oem oil filter and castrol edge 5w40 euro oil in my 16 sxl, never have any rattles or noise on start up. The only thing I can add is to take it easy when you first start the car, let everything come up to temp first, especially on turbo gdi engines.
 

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2017 Optima EX
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Use the factory filter use an oil heavier than 20 weight and use a high quality synthetic oil like Mobil 1 5-30.
you can buy a 5 quart jug of that for $27 at Walmart.

Always keep the oil at the full line takes 30 seconds to check the oil. Highly recommend a oil catch can too.
 
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