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Old 03-07-2000, 01:59 PM
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Join Date: Jul 1999
Location: Tampa, Florida, USA
Posts: 214
I know what the oil pressure is supposed to be: between 1 and 2 bars at idle, and immediately pegged at 3 at any engine speed over idle. Most of the time, my oil pressure is fine.

However, immediately after an extended high-speed drive (e.g. anything more than 30 minutes on the interstate), my oil pressure is lower than it should be by about half a bar. At idle, the needle is just barely over
the 1 mark, and it doesn't peg at 3 until higher RPMs are reached (I don't have a tach, so can't give exact RPMs). After a hard highway drive, in 4th gear (manual trans) it won't peg until about 50 mph. If I'm just driving around town, never getting on the interstate, the oil pressure is fine; after short trips on the interstate (my daily commute is about 10 minutes of interstate each way) it's also fine. However, the low pressure after a hard drive concerns me.

I'm using Castrol 20W50, which I've always used. It doesn't burn much oil, if any - I have to add about half a quart every 1000-1500 miles, but some of that is leakage from around the valve cover gasket, oil filler cap, and crankcase ventilation tube.

I'm guessing the oil pump has an impeller of some sort - is this prone to wear? For that matter, should I even worry about this issue since my oil pressure is fine *most* of the time? I hope to keep this car for another 250k miles as my daily driver, so I want the engine to last.

- Nathan
'83 240D, 250k miles

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Old 03-07-2000, 06:39 PM
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I'll be very interested to hear Benzmac's response to this. Before my 240D engine rattled and died at 516K miles, it was still pegging the guage on the highway.

Since it isn't using a lot of oil and is not going dangerously low at idle, it may not hurt anything, but I expect that Benzmac will shed some of his experience and wisdom on this.

BTW, I bought a ragged 240D with a decent engine, swapped the engine into my trusty old 240D, and I'm back driving it 190 miles a day. They can't be permanently killed by anything less than 18 Wheeler. If it's ever killed that way, I won't have to worry about it.

Good Luck,

Larry Bible
'84 Euro 240D, 516K miles
'88 300E 5 Speed
Over 800,000 miles in
Mercedes automobiles

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