The guy I drive for said low oil is bad but too much oil can be bad too.
The engine is a Detroit DD15
the dipstick read halfway to the Max line, and I put a gallon of oil in and it was over the Max line. (I'm assuming in this situation, although it read over the Max line, it was not over enough to damage the engine)
How can you guage or the rule of thumb as far as knowing not to put too much oil in?
And how much over is too much?
Too much oil can be bad too?
Discussion in 'Questions From New Drivers' started by Jdm5jdm5, Aug 8, 2020.
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Too much oil can cause damage to the front and rear main seal. And now, you have an oil leak. Way too much oil can push the main seals out and now you have a MAJOR oil leak.
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Your fine in this situation driver.. Part of the issue with too much oil is the crank starts hitting the oil in the pan and starts throwing excessive amounts onto the cylinder walls . Some of this excess oil gets past the rings and causes dpf issues.
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Can also cause the oil to "churn" and become frothy.
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Most truck engines require 1 gallon to fill to the full mark when the oil level shows at the bottom of the hash marks on the dipstick.
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Wouldn't even worry about top up until the level was 1/4 the way up the safe range.
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It'd take a lot of oil in the crankcase to hydrolock an engine.
Christmas break 10 years ago. Its -35 to -40 out. Management told all the drivers to leave the trucks running at elevated idle in the yard over the holidays so they'd be good to go. One moron left the truck idle the whole time. Show up at work after the holidays and first job on my list was to check fluids and throw a couple gallons of fuel in if needed. Get to one truck and its bucking away. Hop up in the cab. Barely 5 PSI on the oil pressure gauge. Shut it down and I #### you folks not I couldn't find the level on the dipstick. The oil was so dilluted with fuel the level had risen about a foot on the stick. I fired it up and put it straight in the shop. Most C12 CATs in the fleet took around 36L of oil. I filled up nearly 2 and a half 50L drain pans with oil/fuel from that engine. Never hydrolocked.Rideandrepair, beastr123, 650cat425 and 5 others Thank this.
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