I was gonna go with the Amsoil Signature Series which is good for 25K or 1 year, but im a little anal retentive and I dont wanna run a car on just 1 oil change a year... so I went with the next best thing, Amsoil's XL which is good for 12K miles which im trying to figure out whats the sweet spot.
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Infiniti QX70 & Toyota Supra 3.0 Premium
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