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Oil level

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Old 12-03-2018, 03:05 PM
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sp1990
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Default Oil level

Want to make sure I'm at the right oil level, dipstick has 2 marks I'm assuming low and full but my question is am I at the full line or do I need to add to top of flattened area? Don't want to run oil too low or high and all my Detroit steel I'm used to has a F for full lol.

Wheres full?
Old 12-03-2018, 03:23 PM
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931guru
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Full is the top horizontal line. Bottom line is about a quart low.
Old 12-03-2018, 04:28 PM
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sp1990
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Originally Posted by 931guru
Full is the top horizontal line. Bottom line is about a quart low.
ok so I'm on full then thanks
Old 12-04-2018, 11:29 AM
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Dan Martinic
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Yes, keep it between the two lines or you'll have a leaky Rear Main Seal eventually
Old 12-04-2018, 04:30 PM
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After running and letting all oil drain down overnight this is my oil level. Where it's at I should be ok right? The comment about leaky rear seal has me wanting to drain a little oil out, this may seem overkill but this is my first Porsche!! So I'm going to be like that lmao I want this one to last a long time.
Old 12-04-2018, 04:53 PM
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951and944S
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The rear mains seal, even at it's lowest point is well above your level of oil in the pain.

It can hold back crankcase pressure as well as leakage past the rear main crank bearing.

I doubt an extra 1/2 quart of oil will have any effect on it's ability to seal.

If it did, you had a problem already.

T
Old 12-04-2018, 05:14 PM
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Dan Martinic
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I wouldn't worry about it as it is; a little over for one oil change shouldn't hurt anything, and you'll probably burn it down soon enough. However, when I got my car 10 years ago, its mileage wasn't too high (69k) and heaven knows how or what I read, I understood it as taking 7.5 litres per oil change. So, that's what I'd always put in. It would show past the line, a bit like your photo, but surprisingly not much more than that. I figured it was normal. I didn't notice any leaks for the first few years. But eventually, the RMS started leaking and when I did my clutch last year, it was clear that it had been leaking for a while--nice for rust proofing the undercarriage.

With new RMS in, I have now corrected myself and put only 6 litres in, resulting level being a bit under the line. I then top-off one litre when the light goes on, usually once, maybe twice between oil changes, depending on how hard I've been driving (or not). One litre at light turn-on takes it up to the top line
Old 12-04-2018, 11:08 PM
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I had a brain fart and put in 7 quarts instead of 6. Now the rear of my upper balance shaft leaks. I've been completely unsuccessful at sealing it from the outside. 🙁
Old 12-05-2018, 02:57 AM
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the truth of the matter on overfilling isn't a concern at 1/2 quart over..... in fact most folks who track these cars do so to give an added measure of protection to eliminate oil scavenging during severe apexing in corners.

The number two bearing does not fare well when it runs dry lacking oil pressure to it. The added 1/2 quart 'over' oil is of little concern to that oil seal on either the rear main or the cam seals. I would be concerned if it was a quart or two or showed way past that area over the flat spot on that stick..... but then your oil pressure reading would be pegged and you should have seen the abnormality in that along with the excess blue burning out the tailpipe
Old 12-05-2018, 08:36 AM
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Dan Martinic
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FYI when I was overfilling by a litre & a half, the dipstick showed similar to the OP's above; it was still within the flat area
Old 12-05-2018, 10:49 AM
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You get a lot more potential for combustion pressure to enter the crankcase (boost) due to leakage past the rings on a 944T than an NA car.

Oil leaks, balance cover and rear main seal due to 1/2-1 qt over filled is simply coincidental.

Think about it a second, at static oil level, the height of the oil in the pan is no higher than oil level sensor on the side of the pan.

No way is it anywhere near the lower portion of the rear oil seal, much less even the lower balance shaft.

T
Old 12-05-2018, 11:34 AM
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Dan Martinic
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I *suppose* my RMS fail *could* have been a 30 year old seal finally drying out

Say, I always thought that overfilling can be a problem while the engine is running--not static? Wouldn't the increase in oil pressure possibly cause leaks? Mind you, I didn't notice any reduction in gauge pressure when I went to the proper level
Old 12-05-2018, 12:22 PM
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No leaks until I over filled by a quart. I went from dry as a bone to major leak.
Old 12-05-2018, 12:45 PM
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Dan Martinic
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Originally Posted by snb13
No leaks until I over filled by a quart. I went from dry as a bone to major leak.
Most likely that seal was on its way out soon... just needed a little push

But seriously... it's time to change every piece of rubber, plastic, & solder. We all know it
Old 12-05-2018, 04:43 PM
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Originally Posted by snb13
No leaks until I over filled by a quart. I went from dry as a bone to major leak.
A quart over might (engine running) might cause a drain back problem from the knock outs in the BS casting of the block down to the oil pan but as soon as you corrected oil level, leak would have stopped.

Depending on car model (turbo has lines to cooler, line an quantity before drain back in turbocharger), between 1-2 quarts is suspended in, cam tower, cylinder head, oil pickup tube, passage between girdle and crankcase, etc. etc.

I'd guess after engine running, there's no more than 4-4.5 qts in pan even at idle.

T



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