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For the record, I change my oil and filter once a year using Mobile One . I fill it with 8 or 9 qts warm it up and add oil as needed to top off the dip stick. This pins the oil guage on full when warm. I have never had to add oil between changes. I put about 5k on the car per year. We drive it year round as our 2nd car.
Andy
Skimming through Adrian Streather's book "Porsche 993 The Essential Companion" I did not find anything related to oil consumption that confirms or contradicts what many here have said.
However there is a very detailed description of the 993 dry sump system. Also of interest, beginning on page 85 in the Test Drive section, is a description of the cooling system. "A number of cooling functions are at work at the same time. Aireflow is needed over the oil cooler in the right front wheel arch generated by the car's forward motion. Airflow in the engine bay is generated by the belt-driven cooling fan. The 993 has to be driven to correctly observe all the related systems in operation.
"The test to check that the oil cooler thermostat has actually opened cannot be carried out whilst the vehicle is stationary.
I'll stop quoting here...but he goes on the describe the normal oil cooling system activation sequences.
On page 363 he does mention the oil level indicator and says "The oil level indication can only be regarded as accurate when the 993 is parked on level ground, with the engine at idle and up to normal operating temperature. When driving it is normal for this indicator to be in the red zone when rpm is in excess of 2000 and it may fluctuate at rpm levels below 2000.
He also briefly describes using the dip stick.
I find this series of books to be quite interesting. I'm awaiting the one on the 997...in the meantime I'm reading 993 to go along with my reading of 996.
Here at EPE in Natick this morning for an oil change. There's a beautiful 993 4S here with the engine out. Check out these clogged secondary air injection ports after just 45,000 miles.
Is there any way to slow the SAI port carbon buildup? I heard that cars driven frequently in stop and go traffic tend to clog at lower miles. So for instance would a periodic Italian Tuneup be a temporary fix. Just to note, my car does not burn oil and had the SAI check valve changed recently, which I was told will help as well.
I'm really surprised with the high intelligence and experience of people on this forum that someone hasn't figured out a way to "filter" out the substance that is causing this.
Here at EPE in Natick this morning for an oil change. There's a beautiful 993 4S here with the engine out. Check out these clogged secondary air injection ports after just 45,000 miles.
I'm really surprised with the high intelligence and experience of people on this forum that someone hasn't figured out a way to "filter" out the substance that is causing this.
How do you propose filtering out worn valve guides, which cause the engine to burn oil, which causes the clogging of the SAI ports?
Just filter out the oil before it gets to the valves. The heads don't need it anyway. Like the clutch vent pipe, DMF, rubber shift rod bushing, A/C, sunroof, and airbags...the oil is unnecessary.
How do you propose filtering out worn valve guides, which cause the engine to burn oil, which causes the clogging of the SAI ports?
I really wasn't proposing anything although I am aware of the worn valve guides issue and I'm sure the solution will include proper lubrication of the guides. I'm just impressed with the experience and intelligence of the people on this and other sites and surprised they haven't come up with the solution.
I really wasn't proposing anything although I am aware of the worn valve guides issue and I'm sure the solution will include proper lubrication of the guides. I'm just impressed with the experience and intelligence of the people on this and other sites and surprised they haven't come up with the solution.
Nope - the valves, valve guides, and usual while you're in there items like lifters will all get done with this engine drop. Not my car, and I don't think anyone yet knows the full extent of the work being done, but this will easily run $7,500 or more.
07-06-2015, 01:28 AM
