3-Pedals

Even better!

subshooter

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.

GrantG

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).

JoeGT3

GrantG, could you please post oil filter and screws part numbers ? i would like to change the oil but cant find the part numbers to order the screws and the filters

Thanks !!

GrantG

I’ve been buying this kit (don’t have part numbers handy):

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).

rodneyr

$60 for a filter and 2 washers! That is crazy. That does not even account for taxes and shipping.

JoeGT3

i am in europe, not sure if they ship here .

Anyone with the part numbers could please post it ?

3-Pedals

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.

GrantG

Comes with 2 drain plugs too (if that helps).

GrantG

I originally thought so, but it is very intentional. I’ve followed the procedure in the workshop manual to the letter and only half the oil drains (as specified in the manual). I even have a friend in Europe who addressed this with Frank Stefan Wallinser himself and confirmed the above (no reason provided though).

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).

GrantG

I’ll try to find for you when I get home…

Marv

The reasons for longer intervals are:

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.

Marv

With respect to the mystery of where the rest of the oil is, could it be that the oil cooling system is where it is at, not the engine?

JoeGT3

i really apreciate it, thanks !

GrantG

No, don’t think so. Maybe a liter or a bit more, but not half…

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.