Motor hasn’t run in six 6 years

[Randy_R]

Chevy 350 hasn’t run in 6 years. We will squirt Marvel Mystery oil in the cylinders. I have Mobil 1 15W-50 and 10W-30 ZDDP oil in several varieties. Before we hand turn the crank we will prime the oil pump until we see oil in the pushrods. Does it make any difference which one we use?

 

[Propflux01]

10w-30 should work just fine in that engine.

 

[BrendanC]

i would use whichever is the cheapest for the startup then change it pretty soon afterwards. good idea on MMO in the plug holes and priming the oil system.

 

[Oliveoil2]

10w-30 is all you need. Drain first and see what comes out!

 

[Method]

I would go with the 10W-30 as well

 

[Randy_R]

10w-30 is all you need. Drain first and see what comes out!

Gasoline mixed with oil is coming out. Any harm in using 15W-50? I’m not much of a thicky and I bought this out of curiosity. Also, the cheapest. Can buy at Walmart under $25 for 5 qt jug. Mobil 1’s high ZDDP oil.

 

[Chris142]

Gasoline mixed with oil is coming out. Any harm in using 15W-50? I’m not much of a thicky and I bought this out of curiosity. Also, the cheapest. Can buy at Walmart under $25 for 5 qt jug. Mobil 1’s high ZDDP oil.

Naw you want a thinner oil so that it will get to any dry spots faster than thick oil.

 

[atikovi]

Is this something vintage from the 60s or 70s or a modern fuel injected car?

 

[Randy_R]

Is this something vintage from the 60s or 70s or a modern fuel injected car?

71 Chevelle. 350 rebuilt 30 years ago. Always ran but leaked gas so we pushed it to its current spot in the garage out of the elements.

 

[atikovi]

I'd be more concerned about the condition of the gas in a carburated engine after sitting that long.

 

[Randy_R]

I’m rebuilding the carb. Hopefully Stabil kept gas from spoiling. I’ve had good luck so far with a couple small engines.

 

[Invisible]

We will squirt Marvel Mystery oil in the cylinders.

Why?

 

[Randy_R]

Why?

Why what? Not a good idea?

 

[Invisible]

Why what? Not a good idea?

Are you looking for an upper cylinder lubricant because the engine wasn't started in so long?

 

[Randy_R]

Are you looking for an upper cylinder lubricant because the engine wasn't started in so long?

Y

 

[FCD]

Why not just crank it on the starter with the plugs out until it you see oil coming out the pushrods , if you can see from the oil fill cap.

 

[ARCOgraphite]

I work on old cars often. from 1934 to '67 to '71 and my DD.
Pull the fuel line off the mechanical pump and drain out the gas if it had less then 3/4 a tank. At least get the water off the bottom until the stuff looks and smells good. If it smells stale, you will have to drain the whole tank. Stabil isn't going to do much for you after tha many years unless it was pure gas.

Was it filled E10 or E0 non-oxygenated?

Be careful working with loose fuel and fumes around. A disconnected coil wire or even a sparky starter can start a fire. I would pull the Batt + off the coil.

 

[cheesepuffs2]

I would think a squirt of motor oil from an old-school oil can through the plug wells would be better than MMO, no? Thicker than MMO to produce ring seal and make the initial start-up quicker.

 

[kmrinpa]

Why?

MMO gets into tighter areas, can help unstick rings, precoat cylinder walls above pistons (not all will be TDC), and might get under/around new rust inside the engine from sitting...

 

[ka9mnx]

I would use the cheapest 10w-40 off the shelf from WM (SuperTech), run it at fast idle for an hour, drain, check condition of the oil, if it looks OK put in the oil of your choice. I would be more concerned about the fuel system.