996 Engine Longevity
#16
With shock loading, do you mean shifting crazy?
Why doesn't the aos like track?
(I have done maybe 15-20 40min stints in my 996. lot of it in hot weather. No problems. But mine is a DD with stockish setup and 200tw tires.)
Why doesn't the aos like track?
(I have done maybe 15-20 40min stints in my 996. lot of it in hot weather. No problems. But mine is a DD with stockish setup and 200tw tires.)
#17
Clarification. Shock loading is anything that creates a shock into the system, as I alluded to earlier, driving a very stiffly sprung car at Sebring, and pounding over bumps. Full throttle first gear starts over rough pavement would do the same. Speed shifting likewise. And yes, many cars that don't use slicks and aren't set up as dedicated track cars may not have the AOS issue; its when you induce higher cornering g loads that aos issues will arrive; the outer loop at The Glen being a prime culprit....high speed, banked pavement, consistent and/or extended g loading. I went through three or four stock AOS's before I threw in the towel and bought the Motorsport part; no issues in 7 or 8 years.
The following users liked this post:
turbogrill (12-27-2019)
#18
Drifting
You don't need terribly extreme conditions to get the AOS to dump oil into the cylinders. Even spirited runs at the Limerock autocross course got my car smoking like crazy. It cleared itself out when I returned it to street duty.
#19
Three Wheelin'
Thanks for sharing!! I always enjoy hearing from owners who put their cars to the test on the track. 26k miles of track pace is also what I have seen with the fleet of 100 Porsche Driving School cars that I had to maintain. They also used Mobil 1 A40 exclusively ( due to contract requirements) and warranty purposes. 0-40 Mobil 1 Euro until the 5w-50 FS-2 was released, now that;s all they use.No special warm up ritual, they would just start up how ever many cars they would need for the amount of students, let them idle warm up while the students were saddling up. Those "students" were not the best drivers, they drove the cars hard, missed gears, over-reved, burned up clutches ect., but the engines held up.
You stick with Mobil 1 because it is A40? There are lots of A40 oils on Porsche's list. A lot of independent work has been done that shows Mobil 1 anything is far from the best choice. But if you frequently change your oil (every 3 months or every track day) then I guess the negatives are not as severe.
Motul 8100 X-Cess 5w-40 can be had from amazon in 4 large jug cases and shipped free. Is it Mobil 1 cheap? No, but it is A40 and 100% synthetic and proven to be the best oil shy of a Raby product.
Edit: I just noticed you said warranty & CONTRACT requirements). Missed that.
#20
In no particular order....Im aware of the argument about not letting a car idle for too long, but I happen to believe that most of that dates back to the days of carburetors and less than perfect cylinder sealing. With modern fuel injection, better sealing, AND, changing the oil every 6-9 days, whatever dilution occurs is offset by limiting the thermal shock (temps changing too fast).
It has a Brey Kraus deep sump oil kit, and I run the oil at the top fill mark all the time. Occasionally, if I overfill by a 1/4 of a quart or more, I'll get a little ingestion back through the mass air sensor which will make the car run rough until it cleans itself out.
Actually, Porsche engineers didn't know squat one way or the other if the M96 based cars would sell at all. In the end, those two cars saved the company, but they didn't sell millions.
Don't forget...
Cylinder Bore Scoring, D-Chunk, Intermix to name a few other f'd up things with these engines.
Actually, we got EXACTLY want they wanted - an engine with 31+ failure modes.
However, once addressed by companies like Flat 6 Innovations and Hartech, then they become what they should have been in the beginning.
The following users liked this post:
85eurocarrera (12-27-2019)
#24
Clarification. Shock loading is anything that creates a shock into the system, as I alluded to earlier, driving a very stiffly sprung car at Sebring, and pounding over bumps. Full throttle first gear starts over rough pavement would do the same. Speed shifting likewise. And yes, many cars that don't use slicks and aren't set up as dedicated track cars may not have the AOS issue; its when you induce higher cornering g loads that aos issues will arrive; the outer loop at The Glen being a prime culprit....high speed, banked pavement, consistent and/or extended g loading. I went through three or four stock AOS's before I threw in the towel and bought the Motorsport part; no issues in 7 or 8 years.
Do you have any pictures? Is your car very similar to a SP996? Do you know how much it weights without driver and full of fuel? Rwhp?
They changed the classification for WRL a little so I think they are legal there now. Would be awesome
#25
Rennlist Member
#26
[img]blob:https://rennlist.com/687270ac-ebc3-4098-95d6-d7647cbb4915[/img]A picture. Ten years of development. It weighs 2615 pounds without me, and one gallon of gas. About a hundred more with a full tank.
#27
Race Car
true, but there are thousands of these positive data points to counteract the hundreds of "failure" data points; they just don't get posted.
#28
Rennlist Member
#29
Rennlist Member
You stick with Mobil 1 because it is A40? There are lots of A40 oils on Porsche's list. A lot of independent work has been done that shows Mobil 1 anything is far from the best choice. But if you frequently change your oil (every 3 months or every track day) then I guess the negatives are not as severe.
Motul 8100 X-Cess 5w-40 can be had from amazon in 4 large jug cases and shipped free. Is it Mobil 1 cheap? No, but it is A40 and 100% synthetic and proven to be the best oil shy of a Raby product.
Edit: I just noticed you said warranty & CONTRACT requirements). Missed that.
Motul 8100 X-Cess 5w-40 can be had from amazon in 4 large jug cases and shipped free. Is it Mobil 1 cheap? No, but it is A40 and 100% synthetic and proven to be the best oil shy of a Raby product.
Edit: I just noticed you said warranty & CONTRACT requirements). Missed that.
#30
Pro