On my wife's German car, the engineers placed 12 bolts on a belly pan, which prevent reasonable access to the oil drain plug. So for that car, I siphon the 6 quarts of oil and believe I get most, if not all the oil (based on what comes out).

That said, what is the preferred method on a 928 s4, changing the oil? I tried a forum search, which didn't yield anything of matter.

Also, is one brand filter suggested over another - or specifically, is there something to stay away from?

Your tips and details are appreciated, thank you.

 

One single drain plug on the oil pan on the side. Norma drain.

 

What Jake said about the drain plug. On my 85 it's very easy to get to. Not sure about the later ones and their belly pans, though.

Proper oil filters are available from the "Usual Suspects." I know for sure that Roger has both the Mann "OEM Spec" and the "Porsche" filters. My understanding is that it's the same filter, just labelled differently.

 

On my car both drain plug and filter are accessible with the belly pan in place (from memory, haven't changed oil in a while) ...

In terms of tips I would just say those 9 Qts come out in a hurry, so be ready!

BTW, welcome to the 'shark tank'!

 

87 and up the belly pan has to come off . unless it has the aftermarket alum pan with a trap / access door .

 

If true - you are missing the main belly pan...

Alan

 

cut a hole in the belly pan.... that's stupid. (edit: I mean that its stupid to NOT have a cut hole or hatch there.. so simple! )

anyway, syphon doesn't work. you will leave about 2-3 quarts of dirty oil in the pan

 

The nastiest stuff comes out last. Also be sure to change the oil when hot to keep the solids in solution. Changing cold oil via the dipstick is asking for sludge-city.

 

I have a Mityvac 8 liter oil evacuator that I use on my wife's CLK, as it has 3 belly pans and is generally a PITA to change the oil on. I can get 8.5 quarts of oil out of the dipstick, and the stated capacity with filter is 9 quarts, so that is reasonably complete. However, due to the diameter of the hose that fits down the dipstick, it takes about an hour to pull all the oil.

If you have a belly pan on your 928, getting the pan off and back on is a PITA, though some people have engineered a trap door over the drain area.

On a later car, the dipstick hole gives a straight shot to the bottom of the pan, so if you are patient you'd get almost everything out. Certainly less than 1/2 qt leftover, or no more than is trapped in the oil cooler and its lines regardless of how the oil is changed....

On an early car (78-82) you'd have to make sure your siphon tube hits the hole in the 'petals':

 

Thank you for the welcome!
What year is your car? Ours is a 1988

Not scared of 9 quarts, as my truck takes 15!!

Any pics of the belly pan, or ways to get past it?

What is it with the German cars and belly pans? My wife's car has a DOZEN bolts around the perimeter of the belly pan. It takes 6 qts and I can get all 6 out w/ a siphon evaq pump. But the comments here suggest that not possible w/ the 928 engine

Thanks again

 

Are filters available from local parts houses?

For my truck though, I just go to Wal Mart and get the factory part. I doubt that'll be the case, here

 

I disagree, I think it's entirely possible. But changing the oil without changing the filter is kind of a waste of time, so either way you need to get underneath to R&R the filter.

Walmart doesn't carry the FRAM PH6583 online. 928 Oil filters may be available locally but are no more expensive if ordered from the 928-specific vendors, and you won't get the proper drain plug sealing ring taped to the side of the box from Pepe Boys, unlike your frinedly 928 vendors. You may as well become friendly with them anyway, your 26 year old car will likely need more esoteric parts, correctly supplied, sooner rather than later.

http://s287999742.e-shop.info/shop/a...0201%252005%26

http://shop.site-link.com/928intl/pr...928-107-201-05


Belly pan(s) pic:

 

I use a Pella vacuum device to take all the old (warm) oil out of the dipstick tube. I then change the oil filter.

A couple of times I checked if any more oil would come out if I removed the sump drain plug, but none did.

 

Only the front "black metal" belly pan needs to be removed to do an oil change as seen in Rob's picture. I have always removed the belly pan to change the oil & filter. I use Mann filters.

 

So, that looks like 4 bolts (on the one end) and a flange (on the other) to hold in place, correct?

I have a lift in the garage, so getting the car in the air isn't an issue. Looks much easier than on my wife's car with 12 bolts in peculiar locations.