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Just thought about this, but what brands of synthetic oils do most of you guys use, if any? I'm looking at Castrol, Mobil 1, and Amsoil. Any one better than the other and what is the usual service life (for a daily driver)? Thx again! I've also seen brands like Redline and Royal Purple advertised on Performance TV shows. Are they really worth it or overkill for a non/rarely-raced engine?

97 C1500 Ext. Cab 5.7L, MSD 6A and Blaster Coil using Super Conductor wires, Flowmaster American Thunder catback, Volant Intake. Amsoil 5w-30 synthetic oil, and Wester's 93 Hot Tune.
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