Although the oil contaminates are low in this oil sample your wear rates are quite high. 12.2699386503 ppm on Fe is on the high side. I think 15w-50 would be a good purchase with this beast. We don't know how much wear these engines take, over the long haul, because too many of them suffer from low mileage or other events.652 miles on the oil sample, 101992 miles on the car
Also, Don't rule out using a diesel/gas rated 15w-40 oil that comes with a better additive package. Pardon my ignorance but is this is a stroked TPI 350 5.7L? These C4's are what I saw on the road growing up as a youngin' & made me really like them. As a matter of fact I was going to buy a C5 version about 14 yrs ago but It was going to be my daily driver. I ended up buying a 300 HP 1998 Cadillac Eldorado ETC instead.
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