1986951

Okay, now I'm really confused! I decided to go with the Castrol GTX 20w50.

Get the oil, a new Mahl filter, pull the plug on the Oil Tank, drain it out (looks super clean!) and go looking for the "Taco Plate" with the drain plug in it...('83 SC)

It' ain't there! NO drain plug to be seen anywhere...engine casing is solid front to back (except for the bolts to hold the case halves together) Case P/N says
930 1011 11 5R... I thought 930 was a Turbo Part Number??? Has the Turbo Valve Covers on it too...

So I go to the Owner's Manual...yep, right there in the Oil Change section, it shows the Taco Plate and the Drain Plug in it, and says to remove it to finish draining the oil...

So I go back and measure the amount of oil that I drained from the Tank...comes out between 5 and 6 quarts, if you account for what I spilled on me shoes! Back to the manual...yep, oil change takes 10.57 quarts, just like always...

Soooo... where do I go to get the other 5 quarts of oil out of my engine??? AND, did somebody swap in a Turbo case on me when I wasn't looking???

theiceman

Okay no offense but did you actually READ the thread you posted on what oil to use ????????

anyway you have the actual plate right ? if you do you will have to take the plate off I guess. Mine is a 78 and has the plate and plug , but I know some years have the plate only.Pete or Steve would know

Peter Zimmermann

You must remove the plate if it has no drain plug. If there is no plate the drain plug will face to the left, and be about halfway between front and back. Some late '83 SCs got the case designed for use in the '84 > Carreras. No, it's not 3.2L, everything else is SC. Don't be confused by "part" numbers that you see here and there. They are not part numbers, they are casting/manufacturing numbers.

1986951

Yep, read the responses to my post on various oils... Charles Navarro does a lot of work on testing oils, and he says Castrol GTX 20w50 is fine, just change it often...I always do... when I can find the $^%** Drain Plug!

Peter, you would know if anyone does, but there is NO Plate anywhere on the bottom of this engine!

I also did not see anything that looks like a Drain Plug midway on the bottom of either case side...
I do see a 17 mm (head) bolt going up into what appears to might be part of the oil pump, at the very front of the engine. It appears to have a sealing ring around the base of it, which is sort of what I would expect to see on an oil plug.... but...???

Unfortunately, I don't have the factory Service Manuals for this SC, so can't reference anything there.

Yes, this 911SC Coupe is #2492 of 2559 imported, with a build date in July '83, so that probably puts it into the run of cars with the 3.2 liter case...never thought about that, until Peter mentioned it...

So, lets assume it is a 3.2 style case... is there supposed to be an Oil Drain Plug in that Case, and if so, where is it located? I never owned a 3.2 before either, so I can't begin to guess ...

I'll go look again, and if anyone has more ideas, keep 'em coming!!! Thanks much!

Peter Zimmermann

The drain plug has a 19mm hex head and is about halfway along the case, facing to the left, and tightens against a vertical surface.

ga

There should be a big hex drain plug on the drivers side about mid-way down the engine sticking out a bit like half of a big cigar from the centre "case crack"(at least that's where mine is, as I don't have a drain plate either). Good luck, Greg

1986951

Well, Peter and Greg know their late model SC's!!!
The Drain Plug is located in a cast in boss in the middle of the engine, on the Driver's side, and as Peter said, seats against the boss in the vertical plane. Sort of like you would find on the oil pan on a conventional American V8...Simply Not Done on a Porsche? Who is running that place? Must straighten them out!!! Of course, I was looking from the Passenger side, and never saw it!!!

The only (minor) correction I can offer is that both the Oil Tank Drain Plug, and the Engine Case Drain Plug are 15mm bolt head size. Both Plugs are fitted with what appears to be a magnetic "Spike" in the center, and no filings, etc were discovered, tho I can't imagine getting much of anything from an alloy engine! Oil was extremely clean, indicating that the PO did in fact have it changed as the receipts indicated. So...it is refilled (with that nasty Castrol GTX 20w50 stuff!), new Mahl filter, and away we go! Thanks again, folks! You all are the best!

PS: Are the factory Heat Exchangers still available for the SC's? My left one is perfect, but the right one seems to have a bit of corrosion near the front end where the pipes exist. Nothing of any seriousness, but I tend to get obsessive about my Porsches , and if a new one is out there, I would probably fit it.

Amber Gramps

try our sponsor "performance products" for the heat exchangers...

sorry about the oil ice, hope we are still friends.

theiceman

theiceman

I was surprised you still went with the Castrol 951 after everyone voted for VR1 but obviously you have heard good things. Glad you found the drain plug...

1986951

I'm a traditionalist!
Next time i will try the VR1...if i can find who sells it around here... checked my FLAPS, and NO LUCK!

BUT, I have to say...she sure runs great on the GTX 20w50! And the Oil pressure is better than expected! 2 Bars at hot idle... I love it! And it will get dumped in 3K miles anyway!

KC911

That's the most important thing. Do that, and imo almost all modern oils will be fine, but some will have a better "margin for error" (i.e. high temps, etc.) than others. You should also search the archives (here & pelican) for the expert's advice on adding some of GM's E.O.S. Assembly Lubricant (or similar product) each time to replinish some of the "good stuff" that has been reduced in almost all oils in recent years.

Keith
'88 CE coupe

Peter Zimmermann

951: A big Duh on my part! You are absolutely correct - 15mm is the size for your drain plugs. For whatever reason I was thinking about early, pre in-hex trans plugs. Maybe this is a sign that I should put together the trans that I keep tripping over in my garage!

1986951

Pete; I'm just happy to have found the Plug on the engine! don't really care what size it was! ;>))

Thanks again!

ga

i always just use vice grips or a pipe wrench on everything . just giver, and crank away. saves tons of time going back to the tool box. ga