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Bumping this thread. Did anyone solve the mystery around the 4L oil draining?
Did my first oil change yesterday- yes, if you drain from the two prescribed locations and change the filter then it only drains 4 liters.
However, there are 2 other large plugs (one of which was used to drain oil on 991.2 GT3 and a new one next to it).
I suspect that you might get the other 3 or so liters out if you pull those too, but I was too nervous to try.
In the last photo above, you can see 3 of the 4 plugs. The one on the right is the oil tank (you’re supposed to drain from here and also back of engine seen on left of first photo). The two large plugs on left of second photo are not part of the oil change procedure but seem like possibly would drain more oil…
Btw, I also noticed that the oil flap door (where the oil filler and water filler are located) says to use 0W40 C40 oil only. I wonder if they mean that (don’t use 5W40 C40??). I only have a generic 992 owner’s manual. Does anyone with a GT3 owner’s manual see the same instruction or does it say you can use 5W40 also?
Did my first oil change yesterday- yes, if you drain from the two prescribed locations and change the filter then it only drains 4 liters.
However, there are 2 other large plugs (one of which was used to drain oil on 991.2 GT3 and a new one next to it).
I suspect that you might get the other 3 or so liters out if you pull those too, but I was too nervous to try.
In the last photo above, you can see 3 of the 4 plugs. The one on the right is the oil tank (you’re supposed to drain from here and also back of engine seen on left of first photo). The two large plugs on left of second photo are not part of the oil change procedure but seem like possibly would drain more oil…
Do you send samples to blackstone? Would be curious how the metals progress with only half the oil being drained.
I guess this also makes it challenging to switch oil brands or viscosities within the same brand as oil doesnt like to be mixed. Porsche doesnt do things randomly, very curious why they did this.
Do you send samples to blackstone? Would be curious how the metals progress with only half the oil being drained.
I guess this also makes it challenging to switch oil brands or viscosities within the same brand as oil doesnt like to be mixed. Porsche doesnt do things randomly, very curious why they did this.
There are only 2 reasons I can see for doing this:
1. Less environmental waste
2. No loss of oil pressure on first start after change (used to take 2-3 seconds to build pressure and would log a low oil pressure warning).
Are you able to see whats on the car? Does it have the XZN?
Mine did have the XZN M9 size. I used the longer Capri bit with a 10mm ring attachment (like box wrench) on Stahlwille torque wrench. The long version has a little more meat on the shank (10mm hex part that enters the shiny socket attachment).
I am floored by this only getting half the oil out and like you would be super tempted to open those other drain plugs like on the 991.2. I would love for one of the Porsche engineers to explain the reasoning for this maintenance procedure change in their service manual. I too always felt the intervals were too long at 12k miles especially if tracking. On my 991.2 I always changed it at 6k and the oil was dark by then. Maybe they figure by going to a 10k mile interval on the 992 and half the oil that is good enough? I have seen in the past where marketing departments like to push maintenance intervals for perceived lower cost of ownership. Remember Mercedes when they had sealed for life transmissions? Ha, they backed off of that after failures.
I am floored by this only getting half the oil out and like you would be super tempted to open those other drain plugs like on the 991.2. I would love for one of the Porsche engineers to explain the reasoning for this maintenance procedure change in their service manual. I too always felt the intervals were too long at 12k miles especially if tracking. On my 991.2 I always changed it at 6k and the oil was dark by then. Maybe they figure by going to a 10k mile interval on the 992 and half the oil that is good enough? I have seen in the past where marketing departments like to push maintenance intervals for perceived lower cost of ownership. Remember Mercedes when they had sealed for life transmissions? Ha, they backed off of that after failures.
I'd be interested to know as well. However, by only draining half the oil they will have effectively shortened the change interval rather than lengthening it (the manual still says 1 year or 12k miles, doesn't it?). They save the customer 4 Liters of oil per change, but that is a small cost compared to the labor at the dealer. My guess is it has more to do with environmental impact.
BTW, dark oil doesn't mean that it's time to change (you have to do oil analysis like Lex to know the condition of the oil). The darkening of the oil means it is doing its job of cleaning out combustion byproducts.
I agree with your points about the oil analysis being the best judge on when to change. However, my compulsion has been to do it early and I never minded doing it as these cars are an easy oil change. I may be wrongly assuming a new 10k mile interval. I don’t have my new 992 touring yet. It shows 1st year 10k mile maintenance included on my order.
I agree with your points about the oil analysis being the best judge on when to change. However, my compulsion has been to do it early and I never minded doing it as these cars are an easy oil change. I may be wrongly assuming a new 10k mile interval. I don’t have my new 992 touring yet. It shows 1st year 10k mile maintenance included on my order.
Yes, I tend to maintain my cars more frequently than the recommended intervals as well. Part OCD and partly because I enjoy it
I dont understand why oil should stay in the engine more than 3000-4000 miles if you are
- redlining regularly (oil viscosity shears)
- or have short trips around town (the cold start rich open loop dumps too much fuel which again screws up the oil)
- or car isnt driven for 1 month or more for whatever reason (this is not good for any oil)
Oil change costs $100 (oil) + filter/plugs ($60) + 2 hours of your time. Thats $160 for probably the most important maintenance one should do for any combustion engine. Whats the problem in doing many oil changes? By many here 2 times a year to 3 times a year? Thats $500 vs $160, so we are talking about $340 of savings. Thats how much I spend on gas in 1 month at times for my RS. This oil debate always comes up in all brands of cars and I dont understand the logic of people who keep running long oil intervals.
I dont understand why oil should stay in the engine more than 3000-4000 miles if you are
- redlining regularly (oil viscosity shears)
- or have short trips around town (the cold start rich open loop dumps too much fuel which again screws up the oil)
- or car isnt driven for 1 month or more for whatever reason (this is not good for any oil)
Oil change costs $100 (oil) + filter/plugs ($60) + 2 hours of your time. Thats $160 for probably the most important maintenance one should do for any combustion engine. Whats the problem in doing many oil changes? By many here 2 times a year to 3 times a year? Thats $500 vs $160, so we are talking about $340 of savings. Thats how much I spend on gas in 1 month at times for my RS. This oil debate always comes up in all brands of cars and I dont understand the logic of people who keep running long oil intervals.
The oil no longer costs $100 for an oil change - Just 4 Liters cost less than half of that - total cost of parts and oil is now less than $100 (even if you replace both drain plugs and filter). And 2 hours is quite generous - probably close to 1 after you become familiar with the process.
Many auto parts stores will recycle your used oil for free as well (I use Checker/O'Reilly's).
12-18-2021, 12:10 PM
