Im sorry im a newbie how do I check the oil pressure?

The car has an Oil Level Indicator on the dash..did that show low oil ??
If NO , you are OK and it just needs topping
Your original post stated they Forgot to put in the oil. That did not happen .

Is there not an oil pressure gauge in the instrument cluster in front of the steering wheel?

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2012 E350
2006 Callaway SC560

Well, I'm amazed. It appears there is no oil pressure gauge in that instrument cluster.

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2012 E350
2006 Callaway SC560

Oil Level Indicator...so, if they forgot to add the oil , they would certainly have seen the Warning indicator..even if it was just low.. they may also have just gone by the indicator instead of the dip-stick.
Should be fine and use the Dip Stick ..1/2 way mark is fine at 20C

There sure isn't. That was deleted.

There's nothing wrong with checking your oil after sitting overnight, especially if you don't consider the "Min" mark to be a good place to leave it. You're less likely to overfill it that way.

With the gas versions of this era you can check the oil level from the dash and the display will tell you if OK or 1 or 2 qts low, etc.

The E300's of the same years do not have that feature; they only display the low oil level warning.

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Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)

Thanks agian for all the responses. The Oil Level Indicator on the dash did not show low oil and the E300 does not have a oil pressure gauge in the dash so there is no way for me to tell the oil pressure.