Join Date: Apr 2009
Drives: 2006.5 Kia Optima LX 2.4L 4cyl 5-spd man.
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I'm not sure what viscosity oil is best for my 3G Optima's 2.4L 4cyl. The oil cap has 5w20 printed on it, but that seems awfully thin for summer temps. So I checked the owners manual and it states 5w20, 5w30, or 10w30 are fine for my temp. range. What do you guys recommend I use for best engine longevity and performance?
Also, my 4cyl. makes a clatter noise below 2,000rpm. It sounded ugly, so I had them put in 10w30 at my last oil change. It didn't help at all. Is this clatter at low rpm normal for the 4cyl? I asked my Dad about it and he said some engines clatter like that at low rpms because the compression is low at low rpms, but dissapears as rpms and compression increases. I may have misunderstood a little, or is this correct?
and just quick explanation:
5W20 - in general XX W YY
XX stands for high temperature viscosity, the lower the number, the lwoer the viscosity, the thinner the oil film, the better fuel economy
YY stands for low temp properties. Higher number means higher viscosity, so the lower temperature, the more energy needed to pump the oil. For example 20W50 will have high viscosity at 100C what means, old engine will perform quieter, but at low temp (below -10C, 10F) will be very hard to pump. It will look like honey.
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