Hello everyone. I drive out of the garage after the oil and lube service and the indicator shows low oil. I go to my shop guy, he empties off all the oil and fills in new oil again. No indication of any oil leak. All goes well after that.

Recently I again went for my service. This time I ensure that he allocates 6 liters of oil (since my engine is 5.7L). And the indicator again showed low oil after the service.

Today I bought a one liter can of oil (same oil brand) and I will top up the engine with the oil, and see if the indicator lights up again. Could it be that the service guy poured in less oil? Or does the engine shed some oil after servicing? Has anyone seen this before or have any possible explanation?

thanks / Bharat.

 

You need to rely on the dip stick to check oil level NOT THE LOW OIL LEVEL INDICATOR.
After a service let the motor run for a few minutes then shut it off for a few minutes. Pull out the dip stick with the yellow grip and wipe it off. Put it back in all the way then pull it out and see with your eyes if the oil level is in the area of the stick with the crosshatches. If it's too high then drain some oil if it's too low then add some.
LS1 do NOT take 6 liters of oil. They take 5.5 quarts in an f-body car which is a lot less than 6 liters.

 

5.5 US quarts = 5.20494122 liters

Drain the oil down a little bit. and check on the dipstick as previously mentioned.

 

When I first got my Z, the low oil light would come on occasionally. I found the connector loose on the oil level sensor plug. The way the wires were routed around the transmission cooler lines put a strain on the wires. I rerouted the wires a bit and also cleaned the contacts on the plug and connector with ultrafine sandpaper & WD40. Problem gone. The connector is on the passenger side of the oil pan.

 

Hey thanks for it. I topped up the oil, and the dipstick level shows fine now. Just a little question, is a little excess oil harmful to the system?

 

yes it is. I'd rather be alittle under then over

 

The higher oil level may create higher pressures and then get past the piston rings or valves then get combusted then ruin your catalytic converters...not a good ting for anyone

 

It's not a recommended situation and I wouldn't run mine higher.
But as far as hurting anything, road racers with LS1s typically run 1 quart over full.

 

That is so wrong.

 

So what happens to the excess oil?

(my oil level is almost 1cm higher than the range shown on the dipstick)

 

One centimeter is fine.

The oil does not get past the rings. It whips into a froth and the aerated oil does a bad job of lubricating. Too much oil creates drag on the crankshaft and if the oil is to get out, it would be through the positive crankcase ventilation. Much oil leaving this way soaks the intake and enters the combustion chambers. This in turn causes detonation as the oil in the mix will create an unstable flame front. The ingested oil will take out the oxygen sensors and catalytic converters. The valves, piston tops and combustion chamber will be layered with carbon from the burnt oil; this will also cause detonation as the carbon holds the heat from the previous combustion and ignites the fresh charge prematurely. Extreme case of over fill would be to blow past the main seals. The ultimate over fill will create a hydraulic lock and devastate the engine; breaking connecting rods and cracking the block.

I think all that's right. ???

 

More oil cannot be all good. I think I'd drain off some of the oil as soon as possible.