Purchased a 2014 Raptor Screw, White. 108,000 miles. Seems to have service history for oil and other basic maintenance but didn't see anything for transmission fluid. -Should I get a transmission fluid flush? -What is the recommended engine oil weight? Live in South Florida. 5w30? -Spark plugs. Necessary to change out now or wait? I'm getting quotes around $500 to get this done.