Thou shalt not take thy ZR-1 to a unknowing dealership for engine maintenance,

especially not an oil change!
Latest one I know of; dealership "worked" on the engine, severely damaged it & tried to cover up a broken piston by welding the broken piston

while still in the cylinder. Then sent it home with the owner....... like it was fixed......NOT!
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Jerry Downey
JERRYS LT5 GASKETS & PARTS
http://www.jerrysgaskets.com
1994
ZR-1, Black/Black, Lingenfelter Aerobody, 416cu in, 3.91 gears, coil-over susp, Brembo brakes, etc.
2016 Black-Red, 3LT-Z51 Auto 8-speed.