I tok it for a 30 mile drive parked it and then left about 20 min later, I got in the car and it seemed as if when I started it that it was doggish intil I gave it some gas and then I seen a puff of smoke it looked a little grayish? any ideas it did this once before a few monthes ago, the motor has about a 1,000 miles on it. Thanks

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86Z28, GM 350, Jet perf Q-jet & chip Dual snorkel air cleaner, Edelbrock performer intake, Edelbrock headers, Edelbrock cat-back, Off road pipe, MSD 6AL, Accel Super Coil, Taylor Spiro-pro wires, Rapid fire plugs, Jet fan switch, World class t-5, Hurst Short Throw Shifter, Ram Flywheel, Center force dual friction clutch,Aluminum drive shaft, BW disc rear 3.45's & a posi, PBR calipers, Earls braided brake lines, Polygrapite bushings all the way around, poly tranny mount & torque arm mount, Hotchkis lower control arms & panhard rod, Rancho limiter straps, KYB struts & shocks, Gm Wonderbar, Edelbrock strut tower brace, SSM sub frame connectors, Jamex lowering springs, Carbon metallic brake pads, Crossed drilled rotors, Mobil 1 Tranny fluid & motor oil, GM syntheic rear end oil, K&N, Grant stering wheel, 1,200 watt system, Jet Black Paint, 91 Z28 rims, 92 wing, Tinted windows.

 

A new engine often will consume extra oil while it is breaking in, until everything loosens up a bit. How much oil has it consumed on the dipstick?

The "grayish" smoke can be a combination of "blue and black". The black would indicate a slightly rich situation, the blue would be oil. However, if you previous engine burnt a fair amount of oil or had an "oily death", I have found it takes awhile for the exhaust to fully clean themselves.

But I would monitor the dipstick to determine if it is indeed consuming oil and if it is unreasonable. BTW, you may want to consider changing the oil again...it could indicate that "engine lube" that is used in new/rebuilt engines may still be hanging around from your 500 mile oil change.

Consider going to synthetic at 5,000-10,000 miles. But for now, stick with straight 30W oil. This is what I have always used on any new/rebuilt engine I have owned in the last 30 years and it has always given me a long lasting motor.

 

btt

 

Anyone else thanks

 

What Glenn said is correct. There's nothing else to it...

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92 Z28 L98 350
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Ported and polished heads, ported stock TPI base, ported plenum, Comp Cams XR270HR-10 cam (lift .495/.502 duration 218/224 lobe separation 110), Edelbrock TES headers, LT4 valve springs, Crane AFPR, Flowmaster catback with LT1 style tips, MSD coil & wires...

"Take that auto, drop it in first, hold the brakes, stomp the gas and grin from ear to ear! :-)