Can you tell me how much coolant an 83 240D holds. I do NOT have an expansion tank (at least, I do not see one). I added 2 gallons and it appears that I can add more. I do not have a dipstick measuring device...

I keep pouring into the top of the radiator and the level remains the same, very strange.

Yes, I am using coolant purchased from the dealer.

AC

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'83 240D (W123) 321K miles
250KM Mileage Award
500KM Mileage Award

'84 300TD (W123) 215k miles
250K mileage award pending