DIY Oil Change on 992 GT3
#76
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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).
Many auto parts stores will recycle your used oil for free as well (I use Checker/O'Reilly's).
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#77
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I really don't understand only changing half the oil at a time (from an engineering perspective). I understand Grant's comment about the environmental impacts but that has nothing to do with the care and feeding of this ICE engine. I wonder if that is how it is intended per the shop manual and how Porsche dealerships would do it? Maybe I missed that shred of evidence in the above comments.
For example, if you are only changing half the oil, you are really only diluting the degraded/contaminated oil by 50% so the next service interval will start off with 50% contaminated/degraded oil at the start of it's service interval. The third service interval will start off with even a higher percentage of contamination etc and so on. Granted, its probably more important to replace the filter than all the oil but this still does not make any sense to me.
For example, if you are only changing half the oil, you are really only diluting the degraded/contaminated oil by 50% so the next service interval will start off with 50% contaminated/degraded oil at the start of it's service interval. The third service interval will start off with even a higher percentage of contamination etc and so on. Granted, its probably more important to replace the filter than all the oil but this still does not make any sense to me.
Last edited by subshooter; 01-03-2022 at 10:03 PM.
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steve9 (04-22-2023)
#78
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I really don't understand only changing half the oil at a time (from an engineering perspective). I understand Grant's comment about the environmental impacts but that has nothing to do with the care and feeding of this ICE engine. I wonder if that is how it is intended per the shop manual and how Porsche dealerships would do it? Maybe I missed that shred of evidence in the above comments.
For example, if you are only changing half the oil, you are really only diluting the degraded/contaminated oil by 50% so the next service interval will start off with 50% contaminated/degraded oil at the start of it's service interval. The third service interval will start off with even a higher percentage of contamination etc and so on. Granted, its probably more important to replace the filter than all the oil but this still does not make any sense to me.
For example, if you are only changing half the oil, you are really only diluting the degraded/contaminated oil by 50% so the next service interval will start off with 50% contaminated/degraded oil at the start of it's service interval. The third service interval will start off with even a higher percentage of contamination etc and so on. Granted, its probably more important to replace the filter than all the oil but this still does not make any sense to me.
Last edited by GrantG; 01-03-2022 at 10:14 PM.
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subshooter (01-03-2022)
#79
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Yes, the factory workshop manual instructs to pull the oil tank and rear engine sump plugs and specifies that 4.1 liters of the 8.1 liters total capacity gets replaced with filter change. Lex went to his dealer with enough oil to change the full capacity and had most of the oil returned to him. When I followed the factory procedure, only 4 liters drained out. There are 2 additional plugs where it’s possible that the other 3 to 4 liters will drain, but I haven’t tried (too worried that something unexpected might happen).
Thanks !!
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https://www.suncoastparts.com/product/pkgt3992ofk.html
Comes with everything you need (rubber O-ring already installed on tank drain plug and rear sump plug comes with aluminum crush washer).
Last edited by GrantG; 01-08-2022 at 12:08 PM.
#81
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I’ve been buying this kit (don’t have part numbers handy):
https://www.suncoastparts.com/product/pkgt3992ofk.html
https://www.suncoastparts.com/product/pkgt3992ofk.html
#82
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I’ve been buying this kit (don’t have part numbers handy):
https://www.suncoastparts.com/product/pkgt3992ofk.html
https://www.suncoastparts.com/product/pkgt3992ofk.html
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Anyone with the part numbers could please post it ?
#83
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I still believe the 4.1 liter draining is a mistake that they made in the workshop manual. This goes against every simple principle around oil and what happens to oil in the engine and how new oil and old oil when mixed together provides suboptimal protection.
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very green R (07-15-2022)
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I still believe it may be possible to drain the rest of the oil (or nearly all), by pulling the other two larger drain plugs (if someone is brave enough to try).
Last edited by GrantG; 01-08-2022 at 12:22 PM.
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Captain_ (01-17-2022)
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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.
- 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.
1. Lower maintenance for the customer. Most people just don't like the idea of having oil changed twice a year.
2. Reduce the environmental impact. Recycling oil costs money and energy. Synthetics are designed for longer change intervals.
From a personal perspective I would rather change oil more frequently because oil changes cost less than an engine rebuild. If you want to be OCD about both protecting your investment and environment, then have the oil tested at regular intervals to determine when to change. This is what municipalities do to maximize the economical impact on their fleets.
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Daft Chief (02-11-2022)
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And if the intent was to drain all the oil, they could have provided a drain in the cooling circuit and included it in change procedure.
Last edited by GrantG; 01-08-2022 at 12:54 PM.