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Discussion summary
YOUR RESEARCHLow oil pressure after service
Leading reported evidence
Use so i suspect the filter was not porsche spec
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Performed · outcome unconfirmed · Original poster
Proper oil was used so I suspect the filter was not Porsche spec.
Leading evidence: 'Use so i suspect the filter was not porsche spec' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'filter was not porsche spec' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Check level' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Performed · outcome unconfirmed
Check what oil was used then either change it or drain it and check the filter also and the canister as the bypass valve at the bottom can fail also!
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Suspected cause · Original poster
Proper oil was used so I suspect the filter was not Porsche spec.
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Suspected cause
Probably a good time to ask here for alternative Indies in your area.
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Recommend porsche indy and have it flat bedded there
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Suggestion
Thinner oil would only give lower pressure at hot idle, I would suspect that maybe the filter housing has been over torqued on re fit or a cheap filter has been used , they can twist in the housing on tightening collapsing the pleats blocking flow, I wouldn't drive it really , especially if you are getting low oil pressure warning on start up, find a good recommended porsche Indy and have it flat bedded there?
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Suggestion
The relief spring is behind a bolt on the bottom of the oil pump housing , if you look under the car it's near the engine mounting bracket and exhaust system , further forward in the middle of the sump is the drain plug for changing the oil then further forward still towards the right is the oil canister, which does have a bypass valve inside but it's inaccessible without removing the canister itself !
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Suggestion
I'm trying to find the thread, someone on here went to change their oil but instead of undoing the drain plug they un-did the bolt that holds in the relief spring.
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46 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
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Outcome without a verified action link
Correct installation of a new filter solved the problem.
I am a new 996 owner and just had first oil service done by a "reputable" shop. I now have low oil pressure. Won't go above two bars and give warning at start up.
Is this caused by improper filter installation?
Thanks.
Oil pressure should be at or near high limit cold. Check the level on the dipstick. Look for leaks. Call the shop. Could be bad connection at sending unit or bad sender, which often happens...but quite a coincidence.
Probably a good time to ask here for alternative Indies in your area.
A good test question on this subject would be to ask candidates for your business what they think about upgrading to a spin-on filter conversion. That should quickly eliminate the amateurs.
If one were of a suspicious nature, one might consider that the previous owner had it full of 50W to boost the oil pressure for sales purposes and now it has the correct lower viscosity oil in it?
Thinner oil would only give lower pressure at hot idle, I would suspect that maybe the filter housing has been over torqued on re fit or a cheap filter has been used , they can twist in the housing on tightening collapsing the pleats blocking flow, I wouldn't drive it really , especially if you are getting low oil pressure warning on start up, find a good recommended porsche Indy and have it flat bedded there? don't go back to that shop!! or drop the oil yourself and remove the filter to check it, also it's worth asking what oil and filter they used ?? Should be genuine porsche filter !!
I'm going back to the shop in the AM to get answers to what filter was installed. It is not listed on the receipt so I am suspicious of them.
Proper oil was used so I suspect the filter was not Porsche spec.
First, and last, time I have used this shop.
Thanks for all the advice!
Would definitely recommend the LN spin on filter. Don't be afraid to tackle this yourself if you don't get anywhere with that shop.
All you need is the spin on filter housing + filter, a torque wrench and some oil.
Yes I just bought one for mine , no chance of collapsing the filter as it's the all I one metal canister filter you use with the spin on adapter and also the benefit of full filtration with no bypass!
You are a new 996 owner. You took your car to a shop for an oil change and now have a *big* problem. These cars are not for the faint of heart! Something as important as an oil change for your car is nothing to fool around with. That's why most of us do a DIY oil change so you know exactly what is going on. It is simple and can give you greater confidence with your car. Learn the steps and just DIY. A LN spin-on oil filter adapter and magnetic drain plug make this a cinch and result in better protection for your engine. Unfortunately at this stage you have to figure out what the shop did that would cause low oil pressure, oil viscosity, cheap filter, or gasp...foil top dropped in the oil filler tube blocking the oil pickup tube (something they will probably not admit), so you are left with draining the oil and removing the sump plate to check. Best time ever to upgrade the filter and drain plug.
The car should go back to that shop and have them figure out what happened. People make mistakes all the time, how they come through after it is what makes a good shop from a bad one. There is also the chance they didn't make a mistake either and you have another problem.
I was meaning on install as could be on this occasion the cartridge one can twist , closing the pleats and reducing oil flow , how does a metal cased filter collapse, I haven't heard of this?
Could they have accidentally tried to drain the oil via the pressure relief spring and the spring fell out and they didn't put it back in properly or at all?
I recall another member on here accidentally did that when attempting their first oil change.
Twist during instal??? Is there a ducumented case for this?
Cut open a metal case filter and you'll understand. On the inside it looks like the cartridge filter. Filters usually collaps when they get clogged.
I'm trying to find the thread, someone on here went to change their oil but instead of undoing the drain plug they un-did the bolt that holds in the relief spring. Obviously they couldn't drain the oil like that but rather they thought that was the drain plug.
Perhaps they made the same mistake and re-installed the spring incorrectly causing low pressure?
If a shop did this I would hope that whoever worked on the car gets fired and banished from working on cars forever! I could maybe see someone doing it diy with no mechanical knowledge, but not a shop worker / mechanic. The oil drain plug on a 996 is so blatantly obvious you can't miss it.
The relief spring is behind a bolt on the bottom of the oil pump housing , if you look under the car it's near the engine mounting bracket and exhaust system , further forward in the middle of the sump is the drain plug for changing the oil then further forward still towards the right is the oil canister, which does have a bypass valve inside but it's inaccessible without removing the canister itself ! But I can see how you might get confused, I think the suggestion is that the oil relief spring bolt on the bottom of the oil pump may have been removed instead of the drain plug, behind this bolt is three parts, a spring with a plastic dowel inside it and a piston, if the spring had broken or is missing, will definitely cause problems as when proper oil pressure is reached the piston moves down as the spring compresses to send oil back to the sump, if the spring is broken the piston will move easier, hence low oil pressure
I think you need to check this assembly to see if everything is there and spring looks ok
Check what oil was used then either change it or drain it and check the filter also and the canister as the bypass valve at the bottom can fail also!
Have the oil pressure checked with a mechanical gauge as your pressure sensor might be faulty
Maybe remove the sumo and check the oil pick up is clear.
Be careful about driving it as at this stage it could be an easy fix to restore pressure but if the engine runs without enough pressure it could cause major damage like cams being starved of oil and there are no cam bearings in these engines, the cams run directly on surfaces machined into the cylinder head, if they get damaged the head is scrap and it's going to start costing a lot
Not trying to scare you just be very careful!
Here's the oil pump... look under your rear bumper... you'll see this on the back of the motor...
The relief spring is under the nut to the right of the picture... it faces down when the pump is mounted to the motor.
The service tech mangled the filter when installing it. Correct installation of a new filter solved the problem. I also ordered a spin-on filter adapter.
Thanks for everyone's advice!
How do you even mess up a filter like that? I have been using Mann filters and I put a little oil on top and bottom where it meets bottom of canister and top were it hits engine. I actually push the filter all the way into the canister and then prefill with fresh oil. Maybe it is easier to mess up than one knows and most of us just get lucky?
He didn't mount the filter to the engine, he put it in the canister and forced the canister on the threads. The filter wasn't seated at all, just mashed into a mangled mess. Won't be using them again! Will do my own maintenance in the future.
If ever change my oil and get low pressure that is the first thing I'll check. I've probably removed the filter 12 times now as I check it once in a while even though I am not changing oil. So far no problems.
Good call. Glad you got it sorted before anything terrible happened. You will like the LN oil filter adapter. Get the magnetic drain plug as well. Cheap insurance.
I seat mine in the canister first then screw it on. If you don't do this it's almost impossible to get the cartridge back on. There must have been lots of resistance as he threaded the cartridge in while crushing the filter. It should thread in nice and easy.
Get a new filter housing next oil change if you don't get the spin on filter. If I understand the housing correctly, and oil could not get through the filter, it should have gone through the bypass and you still should have normal oil pressure.
Does this make sense to anyone else?
Yes I know what you mean the valve bypasses the filter if pressure builds up but I think if the filter itself is damaged it probably can't do enough, maybe the bypass was giving him that bit of pressure and saved the engine?? Think the OP has gone with a spin on attachment now!
Good Pickup!
As for a shop giving back a car that's in worse shape than when it came in, lazy, unprofessional and inexperienced etc etc. These cars need to be taken to places that know what they are doing.
Thanks to this forum im able to do more myself, take my time and do it right!
Everyone here will help as much as possible!!
Knowledge and doing it the right was is the key with these cars, if you do your research first these cars are not hard to work on especially service items , nobody will take care like you do with your own car, to some shops it's just another car, another job especially if it's just a normal shop, For harder stuff ask on here for a good Porsche specialist in your area as they do care and know the cars!! I can't recommend as I'm in the U.K. !!
