synthetic question
I have 3 Aerostars, 95 3.0/347,000miles, 97 3.0/299,000and 97 4.0/412,00 miles. These are used by Service techs in our business. I use only Mobil 1 5/30 full synthetic, change every 10,000 miles (easy to remember!). NEVER had any engine trouble and they don't burn oil (honest). Full synth. is the way to go.
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