Well, I think this has been beaten to death already, but here is my experience....
My 129K motor, when I use synthetic mobil 1 10w-30, burns off a quart every 300 miles (!!!! Yeah, that's what I said). When I use regular 10w-30 dino juice (castroL), I dont burn a darn thing. Yeah, the oil is black, but there's not much missing. Guess the previous owners did not change the oil often enough!
I love putting in additives, too, fluids containing teflon and other friction helpers. I put in a quart of "nu-power" and the oil pressure guage now rides in the high area instead of the middle and it seems that the car is easier to start and idles smoother.
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91 GT Carb conversion, holley 600 double pumper, edelbrock performer intake, FMS "C" drop springs, march 1000 underdrive pullies, crane 1.7 roller rockers, GT-40P headers, bassani x pipe, american thunder catback, FMS 4.56's, msd aL6, trunkmount battery, A/C eliminator kit, 3000 stall tci streetfighter, AOD with transgo kit, A+ servo, 300M hardened lockup shaft, kevlar bands and 28,000 gvw trans cooler, 3 core radiator, 300 lbs stripped with a full interior
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