Air Conditioning problem
2004 Nissan Truck 6 cyl Two Wheel Drive Automatic 25500 miles
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Hi guys,
I have a nissan frontier truck 2004. The AC working fine, however, I was wondering if I need to take my truck in for AC service/check up? Is this required every year? Should the cooling system be flushed? My truck only has 25k miles. Secondly,for oil changes should i use synthetic oil in my truck? How about my wife's SRX Cadillac (2005)?

thanks.