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Oil pressure light came on today - thoughts appreciated. It...

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Old 02-02-2008, 08:35 AM
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Default OK ***THE LATEST*** I'm not low on oil, the lifters are NOT making any noise, and...

...VAG COM showed no codes. I'd thought previously I was maybe down some oil as I checked it hot immediately after shut down and while trying to run home with the kids so I didn't allow much time for the oil to come back down.

I've driven at least 30 miles with it like this. If it were a pressure issue I'm assuming I'd have major lifter clatter by now, or worse.

Thoughts are leaning toward defective sending unit.

My bud has the VAG pressure tester but was unavailable at noon when I was there.

Again, going with sender for now.

Regarding oil level... Alumibitch has maybe a quart / 1,500 mile appetite for oil the way I drive it. EVERY German car I've ever owned has mirrored this consumption. I've run mine down 1-2 quarts before and the low level light doesn't even come on, lifters don't clatter, nothing. Think about it - it's an 8 quart system it's not going to miss a quart or 2 for "some" miles - IMHO of course.

I'll report back as I know more, but I'm less in panic mode now as there's no clatter, oil's full, clean, and not smelly, and there's no other indicators to the contrary.

Thanks for the thoughts of course.
Old 02-02-2008, 08:40 AM
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Default Thanks Bob - yeah I'm dumb but I'm not *that* dumb - it's the PRESSURE indicator. Where...

...is the sender located on the 4.2l? On the I5 it was on the driver side under the intake. Like you said, simple / cheap enough to do, with 115k I'm sure it's going to need replacement sooner than later.

Thanks again Bob, appreciate the input.
Old 02-02-2008, 09:39 AM
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Default Don't know about the S8, but on my 97 A8 the oil pressure switch is on the oil filter housing.

Might be worth looking at, check for loose connection or frayed wire or something. Good luck.
Old 02-02-2008, 09:55 AM
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Default I miss my oil pressure gauge on my old V8 Quattro...

you could monitor oil usage according to pressure drop.
It was very accurate.
Old 02-02-2008, 05:10 PM
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Tx Mike - will do in the a.m. - Senor Jack is calling me name right now 8-)
Old 02-02-2008, 05:29 PM
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Default It's on the pass side, remove the airbox and you'll see it. 22mm socket will do.

to remove. I cut the plastic part off the old one so I could get the socket on it (not enough room for a deep socket).

A stubby 22m wrench on a slight angle to install.

They're about $15, not a bad idea to do it anyway just to rule out.
Old 02-02-2008, 06:01 PM
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Default Trying to picture a "stubby 22mm wrench" w/o laughing. Thanks Bob, agreed, will swap it out Mon...

...hopefully.

Appreciate the insight, will report back.
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