Sludge can be caused by a number of reasons. Have you checked the pcv valve? I noticed you also have a 160 thermostat, cold winter air and short trips can lead to sludge build up. Oil temps need to be hot to remove water and vapors from oil.
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94 CAMARO
TURBO 3.5 LITER
12.573 @ 107.29 1/4 MILE
8.021 @ 86.38 1/8 MILE
BEST 60' 1.781
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