2003 Chevy Malibu Synthetic oil

Honestly, that is a personal choice. I will try to give you some info to help make up your mind.

First, remember, oil doesn't wear out. It gets dirty. Both synthetic (syn) and regular (reg) do the same, so you will be changing the oil just as often, and the cost of the syn is much higher. Both oils protect the engine and provide luberication.

Here is the difference. Synthetic oil is a more stable oil. By that, I mean that its viscosity doesn't change. If you have 5W30 syn, ambient temps will not change it. Thus, you have no change and the oil protects the same no matter what the temp. Reg oil, on the other hand, is affected by ambient temps. It can actually take slightly longer for the reg oil to reach all points of the engine.

What this means is this. If you live in extreme temps, go with the syn. If you don't live in extreme temps, I feel reg (organic) oil is fine. I have 220K on a dodge and I have only used reg oil in it. I feel confident it will see 300K before it finally says enough is enough. But I won't stop until it does.

Let me know if you have other questions, and I hope this helps.

Joe