Too much oil can be bad too?

Discussion in 'Questions From New Drivers' started by Jdm5jdm5, Aug 8, 2020.

  1. Jdm5jdm5

    Jdm5jdm5 Light Load Member

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    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?
     
    Last edited: Aug 8, 2020
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  3. mitrucker

    mitrucker Road Train Member

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    Add a quart or two at a time until you figure out what the dipstick is telling you. As far as how much is too much, I’m assuming that would vary by engine. The results of too much oil are usually referred to as hydro lock. Look it up.
     
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  4. TripleSix

    TripleSix God of Roads

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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.
     
  5. TripleSix

    TripleSix God of Roads

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    Not meaning to correct you, but a hydro lock is when you get water/coolant in the combustion chamber (on the top of the piston). Water cannot be compressed and so it will stop (or lock up) the engine. This can (not always) either bend or break a connecting rod, or send the piston and rod through the side of the engine block.
     
  6. magoo68

    magoo68 Road Train Member

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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.
     
  7. Lonesome

    Lonesome Mr. Sarcasm

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    Can also cause the oil to "churn" and become frothy.
     
  8. Cattleman84

    Cattleman84 Road Train Member

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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.
     
  9. AModelCat

    AModelCat Road Train Member

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    Wouldn't even worry about top up until the level was 1/4 the way up the safe range.
     
  10. reeferwrencher

    reeferwrencher Light Load Member

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    Can be oil too.I ve seen it several times.
     
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  11. AModelCat

    AModelCat Road Train Member

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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.
     
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