Synthetic lasts longer between oil changes....if you are a "maintenance super hero", there's no need for it. I pulled apart my original Mustang motor after 250,000 miles, running only the cheapest conventional oil (using police/severe duty maintenance schedule) and it looked like you could eat off of it...no sludge whatsoever. High zinc (as found in high mileage oils) is a good idea for cars without catalytic converters.
70 Roadrunner convt. street car
440+6, NOS, 4-spd, SS springs
'96 Mustang GT convt. street car
'04 4.6 SOHC, NOS, auto, lowered
"Officer, that button is for short on-ramps"
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