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Old 03-10-2014, 08:24 AM   #1
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Oil Overfill Symptoms

I just got back from an oil change and my electronic reader is all the way up, and the dipstick appears to have oil to the top of the red plastic. The car was built in 1/99, so I don't think it was ever calibrated for the latest Porsche TSB in 2/99 that recommended more oil.

I am not getting any smoke on startup, which seems to be a symptom of overfilling. I am not sure if it is overfilled or by how much. Should I be concerned, or does the lack of smoke mean I don't need to worry?

Thanks!
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Old 03-10-2014, 08:36 AM   #2
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These cars should not be overfilled, do so can lead to problems ranging from smoking, to seal leaks, and AOS failure. As you just had your oil changed, let the car sit for at least and hour or two, then switch the key (don't start the car) and check the oil level. If all the bars are lit, you need to drain some oil out of the car.
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Old 03-10-2014, 01:43 PM   #3
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These cars should not be overfilled, do so can lead to problems ranging from smoking, to seal leaks, and AOS failure.
JFP, what seal leaks are affected by this? Had a o ring replaced on my AOS sometime ago, and wondering now if this was because it was overfilled.
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Old 03-10-2014, 05:04 PM   #4
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JFP, what seal leaks are affected by this? Had a o ring replaced on my AOS sometime ago, and wondering now if this was because it was overfilled.
For one, the RMS is much more prone to leak on a an overfilled engine, as is the front crank seal; and the AOS can actually "overload" (it is not designed to work in liquid oil, only oil vapor) and suck liquid oil into the intake, which can lead to a hydro lock.
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Old 03-10-2014, 09:13 PM   #5
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I am going to take care of this ASAP, and drive it very careful and as little as possible until that time, it's my DD so there's no avoiding it. Thanks JFP for the information!

This is the final nail in the coffin of taking my Boxter to a mechanic for regular maintenance. It's probably cheaper to buy the tools to do the oil change, and other regular maintenance myself than pay to fix it when the mechanics mess up.
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Old 03-11-2014, 12:00 PM   #6
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For one, the RMS is much more prone to leak on a an overfilled engine, as is the front crank seal; and the AOS can actually "overload" (it is not designed to work in liquid oil, only oil vapor) and suck liquid oil into the intake, which can lead to a hydro lock.
Appreciate JFP.
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Old 03-11-2014, 05:18 PM   #7
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To get about a quart out you can just unscrew the oil filter, dump the oil from the filter, and screw it back on. You'll need a pan under it or you'll have a mess. Then top back up as necessary a little at a time.
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Old 03-11-2014, 05:56 PM   #8
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Originally Posted by rick3000 View Post
I am going to take care of this ASAP, and drive it very careful and as little as possible until that time, it's my DD so there's no avoiding it. Thanks JFP for the information!

This is the final nail in the coffin of taking my Boxter to a mechanic for regular maintenance. It's probably cheaper to buy the tools to do the oil change, and other regular maintenance myself than pay to fix it when the mechanics mess up.
The oil change is pretty much a no-brainer. I have 2 ramps for the rear wheels, a large oil drain pan, and the special tool for removing the oil filter canister. That's all. It's a 15 minute job.
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Old 03-16-2014, 08:30 AM   #9
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My local dealer overfilled my sump by about 1/2 quart. I had them suck the excess out using their dipstick sucker tool. I don't know how a dealer could overfill the car but perhaps they just pour in X amount based upon some table in their book. Personally I always stop at a quart low from the spec and add a little at a time.

Joe, the problem with ramps is that the car is tilted and you probably won't get all the old oil out.
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Old 03-16-2014, 10:51 AM   #10
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Joe, the problem with ramps is that the car is tilted and you probably won't get all the old oil out.
Maybe Joe's set up like me... my driveway has just the right amount of slope that when the back of my car is on Rhino ramps it sits completely level.
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Old 03-16-2014, 10:51 AM   #11
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Joe, the problem with ramps is that the car is tilted and you probably won't get all the old oil out.
What BoxsterSteve said (he beat me to it).

Not enough room under there to get to everything without the ramps. I drive the front up onto an incline before I back onto the ramps, in order to keep it level. It gets enough old oil out, since I need to use 8 1/2 quarts to fill it after the old oil is drained. You can never get all the old oil out since some remains in nooks and crannies.
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Old 03-16-2014, 06:15 PM   #12
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OK good, you are good to go. I have a mondo 7000 lb floor jack (purchased for my old Ford F-150) that's low enough to get under my Boxster or Miata and raises it up 22". So I always do my work high on jackstands.

Until I get around to putting in an LN bearing I'm going to pull the oil filter and cut it open every 500-600 miles. While I'm under there I can take off the plastic underwear and check things like the coolant hoses. The Assenmacher AST #M0219 is a good fit oil filter wrench and Amazon sells them for something like $17.
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