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Old 15th April 2024, 09:24   #1
ashy90
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Default KV6 oil pressure

What is the minimum acceptable oil pressure on a 2.5 v6 when hot?

I’ve seen figures of: min 3 bar @ 3k rpm, and min 1 bar at idle, but unsure if these figures are when hot or cold…..I am assuming hot?

In practice, are these figures what can be expected on our engines now they are old?

Last edited by ashy90; 15th April 2024 at 10:38..
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Old 15th April 2024, 10:04   #2
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I’ve seen figures of min of 3 bar @ 3k rpm, and min 1 bar at idle, but unsure if these figures are when hot or cold…..I am assuming hot?
Those are the figures from RAVE Ash and I too would expect them to apply to an engine at normal operating temperature.

What's your reason for asking? Do you have an oil pressure problem?

Simon
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Old 15th April 2024, 10:39   #3
ashy90
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Yes, I done a test yesterday when up to full temp, and was getting 3.5 bar @ 3k rpm (so good) but only 0.8 bar at idle (not so good? Or to be expected on a 120k mile engine?)
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Old 15th April 2024, 11:20   #4
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Are you using 10W40 oil Ash? When was it last changed?

Simon
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Old 15th April 2024, 16:10   #5
ashy90
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Drained the oil out immediately after doing the oil pressure test yesterday and replaced the filter, re-filled with 5w40 on this occasion.

What would you expect the oil pressure to be?
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Old 15th April 2024, 16:37   #6
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re-filled with 5w40 on this occasion.
In theory it shouldn't make any difference at running temperature but MG Rover recommends 10W40 for your engine. You could try that the next time you do an oil change.

How are you measuring oil pressure?

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