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#1
01-27-2009, 09:11 PM
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Lower oil pressure
My oil pressure at idle has always been around 2.25 to 2.5 and will always peg out at 3 under load. Today, after approximately an hour drive on the freeway, for the first time I noticed that the pressure has gone down to just a hair below the 2 mark at idle. Anything I need to check or be concerned with?
 I’ve had the car for just over 2 years now and this is the first time I’ve seen the pressure this low.I’m currently using Delvac 1 oil if it matters any… Thanks.
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1995 E300 Diesel 2002 GMC Duramax CC LB 4X4 
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#2
01-27-2009, 09:16 PM
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No, thats great oil pressure. MB says at idle the pressure can drop to .3 bar.
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1985 300TD Turbo Euro-wagon 1979 280CE 225,200 miles 1985 300D Turbo 264,000 miles 1976 240D 190,000 miles 1979 300TD 220,000 GONE but not forgotten 1976 300D 195,300 miles 1983 300D Turbo 175,000 miles http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg
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#3
01-27-2009, 09:49 PM
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Quote:
 Normally pegs at at about 1300RPM when hot.
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Dale http://i52.photobucket.com/albums/g1...MG_2277sig.jpg 1990 300D 2.5 Turbo -155k 2000 E430 - 103k 2014 Jeep Grand Cherokee Ecodiesel 4x4 - 11k 2014 VW Passat TDI SE - 7k Bro's Diesel 2006 E320 CDI - 128k Pop's Benz Pre-glow - A moment of silence in honor of Rudolph Diesel
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#4
01-28-2009, 05:05 PM
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Hey guys, thanks for your responses - it looks like I’ve nothing to worry about?!?! However, why would my oil pressure all of the sudden change like it did? The oil in the crankcase has less than 1,000 miles…
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1995 E300 Diesel 2002 GMC Duramax CC LB 4X4
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#5
01-28-2009, 05:09 PM
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Quote:
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Dan 2005 E320 CDI - 246k 1987 300SDL TD05-16g, Herlevi pump, Elbe manifold, 2.47 LSD - 213k Past: 1987 300D - 264k 
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#6
01-28-2009, 06:50 PM
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Quote:
A possible difference due to Atmospheric pressure?
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84 300D, 82 Volvo 244Gl Diesel
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#7
01-27-2009, 09:28 PM
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In my cars the oil pressure will usually work its way down around 2-2.5bar at idle as it approaches oil-change time.
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 Gone to the dark side - Jeff
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#8
01-27-2009, 09:46 PM
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Nothing wrong with it at all.
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#9
01-29-2009, 11:39 AM
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You said you noticed this after a 1 hour highway run. Is this the first time you have taken a long trip is a while?
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RRGrassi 70's Southern Pacific #5608 Fairmont A-4 MOW car 13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete. 99 W210 E300 Turbo Diesel, chipped, DPF/Converter Delete. Still needs EGR Delete, 232K 90 Dodge D250 5.9 Cummins/5 speed. 400K Gone and still missed...1982 w123 300D, 1991 w124 300D
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#10
01-29-2009, 04:46 PM
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I would stick with the 5W40.
Remember, a small change in idle speed will also effect oil pressure. Could your idle have changed a little.
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Ron Schroeder '85 300 Turbo Diesel 2 tank WVO '83 300 Turbo Diesel 2 tank WVO Some former WVO vehicles since ~1980: '83 Mercedes 240D '80 Audi 4000D '83 ISUZU Pup '70 SAAB 99 with Kubota diesel '76 Honda Civic with Kubota diesel '86 Golf Several diesel generators All with 2 tank WVO conversion LI NY
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#11
01-29-2009, 08:44 PM
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The bobistheoilguy thing is a joke, who's going to trust an Amsoil salesman running 3600rpm tiny straight-cut gears to have any application in the real world. Any oil can fail when taken out of its design parameters.
That being said, I trust Delvac 1 and Mobil 1 neat, and see no reason for Lucas oil thickeners.
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Gone to the dark side - Jeff
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#12
01-29-2009, 11:22 PM
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Quote:
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84 300D, 82 Volvo 244Gl Diesel
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