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Old 12-03-2008, 05:56 AM
bobs's Avatar
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Join Date: May 2007
Location: Richmond, VA
Posts: 310
Question S320 oil pressure takes a long timeto come up!

'97 S320, W140/M104

All, I need a bit of advice. I'm currently in Orlando, FL on vacation with the family. We drove from Richmond, VA at about 80mph most of the way, and the car ran great. Now that we are here I have begun to notice that on startup, it takes 2-3 seconds for the oil pressure to come up to normal. During that time, I hear a rattling noise that I can only assume is the timing chain or lifters. Once pressure comes up everything quiets down and the engine runs great. My initial guess is that the anti-drainback check valve has stopped doing it's job.

We're due to leave for home today and we're taking the Amtrak Auto-Train back so I'm only looking at a 1 hour drive at each end of the train trip instead of 12+ hours on the interstate. Is this something I can live with until I get back home or do I need to get it looked at immediately? BTW the engine's filled with Mobil-1 0W-40, oil level is at "max".

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'97 S320 (LWB), Ruby Red Metallic, 73k miles
'97 S420V, Smoke Silver Metallic, 155k miles

Last edited by bobs; 12-03-2008 at 09:07 AM.
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Old 12-03-2008, 12:28 PM
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Join Date: Dec 2006
Location: Roswell, Georgia
Posts: 130
My M104 is doing the same thing that you described (227,000 miles). I'll be interested to see the responses for this. I don't even know where the anti-drainback checkvalve is at...ha.

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