[coldfoil]

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.

 

[augapfel]

Normal.

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

 

[coldfoil]

Thanks....I'm a newbie on this and I'm just learning about this car so thank you for bearing with these stupid questions.

 

[mckellyb]

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.

 

[merc-one]

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.

 

[frobi]

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?

 

[mckellyb]

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...

 

[Real1shepherd]

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

Awww come on....

Kevin