By now most readers know that it is really easy to overfill the oil in a Porsche 911, in this case my own 991 GT3. (See below on oil filling advice.)

Searching the many forums, I could not find a single source which indicated how to remove the overfilled oil, without having to drain the oil via the oil drain plugs below the car. This is due to the lack of wet sump and the impression (mistaken as I discovered) that there is nowhere to access a sufficient quantity of oil through the oil filler neck to create a vacuum to remove the oil.

This means jack stands, low profile jack and more (all of which I have) but this is a project and takes time.

So ignoring the posted wisdom (?) I looked for the best durable liquids vacuum extractor that I could find. I didn’t want a bulky one or motorized one (air or electric) as storage space in my garage is at a premium.

There are several compact plastic versions that work once and then never again, but the <b><u>OTC (2359) Oil Suction Gun</u></b> OTC (2359) Oil Suction Gun had great performance and durability reviews, costs only $12.87 and ships free with amazon prime. Cannot get a better deal than that!



I knew I would need a longer and smaller diameter tube to get into the nether regions to augment the plastic tube that comes with the OTC (2359) Oil Suction Gun which has an OD of appox. 0.62” and in ID of approx. 0.40”

So armed with my Vernier caliper I went to my local Advance Autoparts Store to look for the right diameter tube but instead I found this hand “PT Deluxe Siphon Hose” vacuum bulb for $4.99 which had the a 0.30” OD tube that would work with some tape, but it had these perfect dimensioned 0.42” connectors that would snugly fit inside the larger tube that comes with the OTC (2359) Oil Suction Gun. (see red connectors in image below)



So I was good to go and try and succeed where everyone else had failed.

My process was simple

• Drive the car for around 4 miles to heat up the oil since it will extract way easier than highly viscous cold oil - I got the oil temp to around 185 F as displayed on the INFO display
• Connect the two tubes together and connect to the OTC (2359) Oil Suction Gun
• Set my oil drain pan behind the car ready to catch the vacuumed oil
• Remove the oil filler oil filler cap and placed a clean towel ready to catch any drips when I removed the tube
• Inserted tube into oil filler and pushed it in towards the centerline of the car, wiggling the tube as I pushed it in, trying to get it to the lowest recesses of the engine, all the while applying a vacuum with the OTC (2359) Oil Suction Gun to see if the end of the tube was in enough oil to get suction
• In my case I immediately hit oil (ha ha) and rapidly came up the tube into the OTC (2359) Oil Suction Gun and I was easily able to dispense about ¼ QT it in the oil drain pan (not a complete stroke on the gun). I suctioned the oil twice to remove too much as it is way easier to add if needed to. Just be careful when removing the plastic tube from the oil filler neck. You will want to grab it to stop it dripping BUT REMEMBER THAT THE OIL IS HOT SO USE MECHANICS GLOVES!

I did the entire process getting the oil level to the top green indicator in less than 5 minutes from the time I parked the car, so much simpler and easier than jacking a car up onto stands, draining oil from the drain plugs, replacing sealing rings and more







I call that GREAT SUCCESS and thought I would share my exploits with my fellow GT3 brethren!\





PS Regarding Adding OIL – NEVER ADD MORE THAN 1/2 QUART EVEN IF YOU ARE AT THE WARNING LIGHT

I got down to the next-to-last Yellow indicator warning light, and doing the math, I put in 1.2Qts, and sure enough, after driving the car, it went to the Yellow Oil Overfilled condition. This happens to a lot of owners, and having the yellow warning light coming on every time you use the car is really annoying, Now I know NEVER put more than 1/2Qt in at a time, drive the car, check the level again, and then add more if necessary. It will save you a LOT of grief by not overfilling the oil in the first place!

 

I did the same "oops" on my GT3 - good work figuring out the less-invasive solution!

 

How long has the engine been overfilled with oil? That oil looks pretty dark. I've run oil 5K miles in both my Porsches -- albeit with 5K miles accumulated in a week or so's time driving half way cross country and back again -- that looked better upon draining.

 

Just under 1,700 miles.

New car, changed oil and filters at 100 miles and again at 500 miles. Do this with all my cars. Now just shy of 2,200 miles