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Old 08-04-2009, 08:15 PM   #1
RGO325CiC
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Anyone market a good HV oil pump?

Just wondering if anyone markets a decent high-volume oil pump. My red oil light comes on when the motor is warm, and only at idle. Oil level is good, I use (fresh) RedLine 5W-30 oil, and I have a VDO psi gauge that reads 10-15 psi at idle, so I'm concerned. Any leads are greatly appreciated.

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Old 08-05-2009, 03:49 AM   #2
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You don't need a HV oil pump, you just need to chhose an oil that meets spec for your engine and Redline 5W30 doesn't. It's too thin (10.9 cST @ 100C) when it has to be a minimum of 12.0 cSt @100C. Why do people do this? sigh........
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Old 08-05-2009, 04:50 AM   #3
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Why would BMW put an oil pump in an engine that wasn't able to deliver enough oil?

The problem is most likely not the oil pump. Look into the correct viscosity of oil first.
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Old 08-19-2009, 07:02 PM   #4
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I checked the owners manual--it specifies 5W-30 or 5W-40, regardless of temp range. The Bentley manual specifies 5W-30 to 50 degrees, and 15W-40 above that. Both list an API of SH or higher; RedLine is SM. Interesting to note that the minimum psi noted in the Bentley states 7psi at idle for the M54, with a regulated 59psi at operating speed. I suppose I'll check the VDO sending unit first, as I still see 15+psi at idle, but swapping to a higher viscosity can't hurt. Just didn't think -30 vs. -40 oil would make THAT much of a difference in psi.
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Old 08-19-2009, 09:16 PM   #5
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Is the oil pump itself in good shape? Or has this issue only occurred since you changed your oil?
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Old 08-19-2009, 09:48 PM   #6
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Quote:
Originally Posted by RGO325CiC View Post
I checked the owners manual--it specifies 5W-30 or 5W-40, regardless of temp range. The Bentley manual specifies 5W-30 to 50 degrees, and 15W-40 above that. Both list an API of SH or higher; RedLine is SM. Interesting to note that the minimum psi noted in the Bentley states 7psi at idle for the M54, with a regulated 59psi at operating speed. I suppose I'll check the VDO sending unit first, as I still see 15+psi at idle, but swapping to a higher viscosity can't hurt. Just didn't think -30 vs. -40 oil would make THAT much of a difference in psi.
RGO
BMW high performance synthetic 5w-30 is actually a really thick 30 weight. If you looks at all of the other BMW approved oils they are usually 40 weights. Being that the engines are probably designed around a thick 30 weight, a really thin 30 weight like redline 5w-30 might lower oil pressure enough to trip the sensor.

If you really wanted to stick to Redline, I'd think Redline 0w-40 or 5w-40 would work better in most situations, like if you live in a warmer climate, and/or track your car on occasion. Though on colder startups and before warmed up you may get a little more engine noise.

Otherwise, the BMW synthetic from the dealer is very high quality, suitable for almost everything, and reasonable priced compared to other oils with ACEA A3 ratings
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Old 08-20-2009, 05:37 PM   #7
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Iceman00--this started once I moved here last year--but only for a couple weeks of rare driving before I stored the car prior to going to Iraq. When I got back, I changed the oil/filter, yet the problem persists. I haven't had any engine issues (compression, oil loss/burning, etc.), so I assume the pump is fine. I'm running a VDO dual-output sensor, so I can read 10+psi at hot idle even as the light flickers on. One thing I did overlook was the fact that I used Teflon tape on the oil sending unit threads; I read elsewhere that this can interfere with sensor grounding, so I'll remove it this weekend and see if it changes things. Since the sender is ~7 years old, I'll swap it out after I try the teflon removal and see what else, if anything, changes.

mkodota--that makes more sense, and I'll likely try the OEM oils next time. I was sold on Redline when I used their manual trans oil in the car when it was new; cold shifting was much smoother, so I've been using it ever since at about 8k intervals. This is the first time I used their engine oil, though.
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