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.
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.
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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