High oil pressure in 996 after oil change
11-01-2008 | 06:47 PM
#16
Burning Brakes
Joined: Nov 2005
Posts: 952
Likes: 42
From: Madrid (Spain)
I took my car in for change at about 10k km (6000 miles) and the shop told me to wait. Said that synthetic oils worked better with some age. They suggested that way too many people dont let the oil run long enough to do its job. They also suggested Shell Helix Ultra 5/40 for the PNW.
Who knows the plain truth????
another oil thread Who wants to go for beers!
+1
11-01-2008 | 08:28 PM
#17
Pro
Joined: Apr 2003
Posts: 600
Likes: 11
From: Frisco, TX
I took my car in for change at about 10k km (6000 miles) and the shop told me to wait. Said that synthetic oils worked better with some age. They suggested that way too many people dont let the oil run long enough to do its job. They also suggested Shell Helix Ultra 5/40 for the PNW.
But the big question is, what have we learned so far? Here are a few points to ponder, based on our experience with the Mobil 1 phase.
- Getting just one oil analysis only tells a tiny piece of the picture. It essentially would serve only as a pass/fail mechanism; without a trend to monitor, the most interesting parts of the analysis would be impossible to see.
- Total base number is a moving target. There are multiple methods for testing it, which makes comparisons between laboratories worthless, and none of the methods have repeatability rates worth getting excited about. While TBN is worth considering as part of the larger picture, as a singular measure it is too flawed to rely on.
- Engine wear actually decreases as oil ages. This has also been substantiated in testing conducted by Ford Motor Co. and ConocoPhillips, and reported in SAE Technical Paper 2003-01-3119. What this means is that compulsive oil changers are actually causing more engine wear than the people who let their engine's oil get some age on it.
- Topping up the crankcase is a critical component of extended oil change intervals, and frequent filter changes are most likely the key to extreme-length intervals. The cumulative effect of even minor top-ups, let alone a filter change, substantially increases the longevity of the oil.
- Getting just one oil analysis only tells a tiny piece of the picture. It essentially would serve only as a pass/fail mechanism; without a trend to monitor, the most interesting parts of the analysis would be impossible to see.
- Total base number is a moving target. There are multiple methods for testing it, which makes comparisons between laboratories worthless, and none of the methods have repeatability rates worth getting excited about. While TBN is worth considering as part of the larger picture, as a singular measure it is too flawed to rely on.
- Engine wear actually decreases as oil ages. This has also been substantiated in testing conducted by Ford Motor Co. and ConocoPhillips, and reported in SAE Technical Paper 2003-01-3119. What this means is that compulsive oil changers are actually causing more engine wear than the people who let their engine's oil get some age on it.
- Topping up the crankcase is a critical component of extended oil change intervals, and frequent filter changes are most likely the key to extreme-length intervals. The cumulative effect of even minor top-ups, let alone a filter change, substantially increases the longevity of the oil.
///Michael
11-02-2008 | 02:34 AM
#18
Racer
Joined: Sep 2008
Posts: 273
Likes: 1
From: Finland
That is what I was told at the Finlands only Porsche dealer. "No need to change oil inbetween the scheduled services". Taking into account that the service is done every 20.000 km and the car is a sports car that sounds like a lot of kilometres to me with same oil.
11-02-2008 | 07:52 AM
#19
Burning Brakes
Joined: Nov 2005
Posts: 952
Likes: 42
From: Madrid (Spain)
That is what I was told at the Finlands only Porsche dealer. "No need to change oil inbetween the scheduled services". Taking into account that the service is done every 20.000 km and the car is a sports car that sounds like a lot of kilometres to me with same oil.
Porsche dealers do the oil change every 20.000 kms in a 996.
But, if you consider that 996 Carrera Mk II 3.6 l. models have the same engine that 997 Carrera Mk I 3.6 models, .... why have they extended the oil change interval to 30.000 km?
They have the same engine, and they use the same Mobil 1 oil.
Why? Could anyone explain it to me?
Are we being robbed by the dealer? The engine is the same. There are minimal changes, so is not justified.
My Porsche private specialist mechanic advise me to do the oil change every 10.000 km or one time per year, including the oil filter.
He's the owner of several Porsche and usually does the oil change every 5.000 kms.
I'm sure that Porsche dealers want to get a good feedback with their clients and It's better for the dealer get always a check inspection every 20.000 - 30.000 kms in their installations than loose clients who go to private specialist, because the interval inspection would be closer to 10.000 km.
The cost of them would cause that clients would look for another solution. That's why I think Porsche dealers, and other brands have a long time inspections to assure the clients go there.
The oil is the engine life. And we are talking about Porsche, a sport car which we usually drive fast and like to demand high revolutions to enjoy.
Porsche are made to enjoy their drive and the hard conditions we undergo with a sporty drive during a complete year (you know that they suffer in cold starts) makes advisable to do the oil change before it began to wear.
There isn't a money question with the oil, so you know the 911's purchase price and the oil is a cheap stuff.
So I usually do the oil change by myself every 10.000 km. A chemistry engineer told me that I was doing the right thing too.
