Safe to say that 15W40 will be fine for the 24V?
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Oil Pressure Light on E30 S52
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Originally posted by cbouchez View PostSafe to say that 15W40 will be fine for the 24V?2006 GMC Sierra 2500HD 4WD LBZ/Allison
2002 BMW M3 Alpinweiß/Black
1999 323i GTS2 Alpinweiß
1995 M3 Dakargelb/Black - S50B32/S6S420G/3.91
1990 325is Brilliantrot/Tan
1989 M3 Alpinweiß/Black
Hers: 1996 Porsche 911 Turbo Black/Black
Hers: 1988 325iX Coupe Diamantschwartz/Black 5spd
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Originally posted by cbouchez View PostAll the research that I've done it looks like it's a good weight. I'm open for options, I'm new to the S50 world and loud ticking valves are driving me crazy. I need to know if the oil weight will make a difference or I just have to live with the loud ticking for now.
Assuming that your oil system is working properly, clacking lifters under normal driving conditions mean that they are sludged up and clogged. Heavier oil won't fix this, and might actually make it worse (or at least is less likely to clear the sludge out). What you may need to do is pull the lifters and try to clean them out or just replace them.2006 GMC Sierra 2500HD 4WD LBZ/Allison
2002 BMW M3 Alpinweiß/Black
1999 323i GTS2 Alpinweiß
1995 M3 Dakargelb/Black - S50B32/S6S420G/3.91
1990 325is Brilliantrot/Tan
1989 M3 Alpinweiß/Black
Hers: 1996 Porsche 911 Turbo Black/Black
Hers: 1988 325iX Coupe Diamantschwartz/Black 5spd
sigpic
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Originally posted by MaxBell View PostQuestion: could a bad head gasket cause low oil pressure?
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I believe 0w40 is the standard weight that is used by the factory. I'll let someone chime in on that one.
When you say that your oil light is on, is it on even if you rev it up a little bit passed idle? Even mine flickers when the engine is warm at idle. I believe thats just because the original m20 and the s52 operate at different pressure when at idle.
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Originally posted by sweet3 View PostI believe 0w40 is the standard weight that is used by the factory. I'll let someone chime in on that one.
When you say that your oil light is on, is it on even if you rev it up a little bit passed idle? Even mine flickers when the engine is warm at idle. I believe thats just because the original m20 and the s52 operate at different pressure when at idle.
The 24v engines seem to have a lower oil pressure at idle than the m20, but the dash light shouldn't come on with either engine.
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An old mechanics trick is to run quart of ATF in with your oil before you change it. let it idle for 15 minutes or so before you drain it. That has worked for me.
If you have more time and have the aptitude to pull your cams out and put back together, you can use this as a guide. I rebuilt the lifters in my S50 and they are identical to these.
And yes, it's from a Geo Metro forum but it has good pics for reference.
'87 325ic, powered by S50.
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Originally posted by ForcedFirebird View Post15w40 mineral is what BMW recommended. We run Liqui Moly 10w60 in them (comparable to the later OE Catrol).
The 24v engines seem to have a lower oil pressure at idle than the m20, but the dash light shouldn't come on with either engine.
FINDINGS
FIRST
The head wasn't torqued down properly and there was coolant in the oil. Changed the oil out, didn't fix the oil pressure problem tho.
THEN
I got an oil pressure gauge on it and it went like this:
IDLE COLD: 20 psi
IDLE WARM: 5 psi
3500 RPM: ~40 psi
REDLINE: 65 psi
The light comes on at idle after a few minutes of idle/warming up. The lifter tick is pretty loud, though that could be coolant in the lifters? How would one flush those?
We're using an M50 oil pump here, would that matter? The S52 and M50 oil pump seem to have the same part number?
Anyways, any help would be appreciated.
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Originally posted by MaxBell View PostI wonder how low?
FINDINGS
FIRST
The head wasn't torqued down properly and there was coolant in the oil. Changed the oil out, didn't fix the oil pressure problem tho.
THEN
I got an oil pressure gauge on it and it went like this:
IDLE COLD: 20 psi
IDLE WARM: 5 psi
3500 RPM: ~40 psi
REDLINE: 65 psi
The light comes on at idle after a few minutes of idle/warming up. The lifter tick is pretty loud, though that could be coolant in the lifters? How would one flush those?
We're using an M50 oil pump here, would that matter? The S52 and M50 oil pump seem to have the same part number?
Anyways, any help would be appreciated.
To fix your ticking, you will probably end up needing to remove your lifters and clean them. You need to remove the little piston inside the lifter and clean the old oil out. Otherwise, you are looking at replacing your lifters. It not easy to find out which ones are ticking (maybe all of them). If you clean/replace any of them, it's best done as a set.
The pumps won't make much of a difference (unless the one is worn out inside)
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Originally posted by sweet3 View PostForcedFireBird is on the right track. If both engines are still in their original chassis, then the lights should never come on while the engine is running. However, the m20 gauge cluster is programmed for ~7psi. That's why your light tends to come on after a while of warm idling. If you compare your current readings to an E36 with the same engine, you will notice that the pressures are about the same, but the light isn't coming on.
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The ticking lifters may clear up after some hard running of the engine if it sat for extended periods of time.
You need 1psi per 100rpm. If you have thin oil and a manual, it's a good chance a 24v will trip the e30 light at 6-700rpm.
5psi is on the low side, but not by much - specially if you have 65psi at oil relief.
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