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Mercedes 1986 300E 165,000 miles
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Discussion Starter · #1 ·
I have a 1986 300E with 137K miles. My oil pressure gauge reads max (3bars) when I first start the car and then goes down as the car warms up. Is this normal? I just recently changed the oil and filter. Used 10W40.
 

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About a dozen 1988, 1989, 1990, and 1991 sedans, wagons, 4Matics and 1 coupe
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Normal.

I'm not going to get into the "what's the right oil" discussion.
 

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Mercedes 1986 300E 165,000 miles
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110 Posts
Discussion Starter · #3 ·
Thanks....I'm a newbie on this and I'm just learning about this car so thank you for bearing with these stupid questions.
 

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It's not stupid, just ignorant, and unless you're clairvoyant, ignorance is normal.

Not asking...now that's stupid. ;-)

I've found the oil pressure on my 3.2L stays higher at running temperature than it did in my 126 with the 4.2L V-8. The 4.2 was just under 2 mb, but the 3.2 is consistently above 2, in gear and fully warm. I mean, even after a 20 mile freeway drive.

This makes me happy, as internal lubrication isn't likely a problem. My 124 is still in its probationary period...probably until early-next year. If the transmission holds together until the autumn, I'll be happier about it.
 

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1988 300E, 2006 E350 wagon
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coldfoil, this is normal.
my understanding is that as the oil heats up it loses viscosity. so, under normal operating temps the oil pressure should be lower than with a cold motor. it's fine if the needle drops to 1 at idle, but it should move back up to 3 when the motor rpms increase.
 

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2011 GL 320 CDI, 2004 E320, 2000 C230, 2004 Toyota Sienna
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231 Posts
My oil pressure gauge shows at 2 when I am doing 120kmp and rpm is 30000.
Gauge needle used to go to 3 few weeks ago. Any ideas why?
 

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My oil pressure gauge shows at 2 when I am doing 120kmp and rpm is 30000.
Gauge needle used to go to 3 few weeks ago. Any ideas why?

Tip 1.

Start a new thread. Also, if your engine turns 30,000 RPM, there is a definite problem... :p
 
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