Mobil oil co. recommends 0w40 for our cars
07-23-2009, 08:38 PM
#17
Maybe a year ago, Panarama magazine did an article on oil and discussed why Porsche changed their oil recommendation to 0w-40 synthetic. I don't remember the details, but part of the discussion was around how oil technology has dramatically improved over the years making it possible to run this grade year round. Cold start up was also mentioned.
If somebody is really ambitous and saves these magazines, they could look it up and post it back to the group.
If somebody is really ambitous and saves these magazines, they could look it up and post it back to the group.
07-24-2009, 12:59 AM
#19
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07-24-2009, 09:19 AM
#21
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Maybe a year ago, Panarama magazine did an article on oil and discussed why Porsche changed their oil recommendation to 0w-40 synthetic. I don't remember the details, but part of the discussion was around how oil technology has dramatically improved over the years making it possible to run this grade year round. Cold start up was also mentioned.
If somebody is really ambitous and saves these magazines, they could look it up and post it back to the group.
If somebody is really ambitous and saves these magazines, they could look it up and post it back to the group.
They just did another oil review just this year basically talking about ZDDP and the effects with studies done by L & N engineering (can't remember if that was the name).
Newer cars M-1 is great, older cars waste of $$. Also, conventional oil doesn't need changing till up in the 5k range unless you are doing performance driving (racing/DEs/Rally) or thrashing on dirt roads. They found that too early oil changes are causing excessive wear as oil is not reaching it's peak until past 4 to 5k.
I run high ZDDP oils like Brad Penn or Valvoline Motorcyle oil. Stopped my leaks (use to run M-1) and no consumption. Go to L & N website, they rate every oil in it's effectiveness and they can check your oil and see how well of a job it's doing and how much metal they find, giving you a recommendation needed for your particular car.
07-24-2009, 10:01 AM
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It is a fact that Porsche now recommends 0W-40 synthetic for all models going back at least as far as the early 1980's. On all new Porsche models, there is a very limited range of recommended viscosities, with 0W-40 and 5W-40 among them. 15W50 is NOT recommended. Part of the reasoning, as I understand it, is that the motor oils also serve a hydraulic fluid function in the engine, which requires the oils have low viscosity numbers at low temperatures.
07-24-2009, 11:17 AM
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It is a fact that Porsche now recommends 0W-40 synthetic for all models going back at least as far as the early 1980's. On all new Porsche models, there is a very limited range of recommended viscosities, with 0W-40 and 5W-40 among them. 15W50 is NOT recommended. Part of the reasoning, as I understand it, is that the motor oils also serve a hydraulic fluid function in the engine, which requires the oils have low viscosity numbers at low temperatures.
changing to synthetic oil on a used motor has been documented to use/leak more when the change is made.
it makes me wonder who they're thinking about, the owner/enthusiast or potential maintenance $$$$.
87951
95sl320 dd
07-24-2009, 01:15 PM
#26
It is a fact that Porsche now recommends 0W-40 synthetic for all models going back at least as far as the early 1980's. On all new Porsche models, there is a very limited range of recommended viscosities, with 0W-40 and 5W-40 among them. 15W50 is NOT recommended. Part of the reasoning, as I understand it, is that the motor oils also serve a hydraulic fluid function in the engine, which requires the oils have low viscosity numbers at low temperatures.
I am currently running Royal Purple 10W-30 XPR. Their oil engineer concurred with my mechanic on what I should be running after we went down the list of modifications. Like my mechanic, he cautioned against heavier oils.
Your comments make sense based on the feedback from my mechanic and Royal Purple. Anyway, the car does exceptionally well on 10W-30 RP XPR.
07-24-2009, 01:19 PM
#27
i guess porsche isn't too concearned with maintenance issues for older cars where oil wt was referenced by temps in the owners manual.
changing to synthetic oil on a used motor has been documented to use/leak more when the change is made.
it makes me wonder who they're thinking about, the owner/enthusiast or potential maintenance $$$$.
87951
95sl320 dd
changing to synthetic oil on a used motor has been documented to use/leak more when the change is made.
it makes me wonder who they're thinking about, the owner/enthusiast or potential maintenance $$$$.
87951
95sl320 dd
I thought the oil leakage with synthetic was an old wise tale. I moved from non-synthetic to synthenic in my 1987 924S without issue. As far as I know, everything was original. It did not leak a drop of oil.
07-24-2009, 01:44 PM
#29
Yes, I should have said flow rate through the external oil coolers instead of pressure.
With a thicker oil the pressure will build more quickly and be vented by OPRV and there would be a lower volume of oil going through the oil cooler. I am putting words in his mouth, but I believe this is what he meant.
With a thicker oil the pressure will build more quickly and be vented by OPRV and there would be a lower volume of oil going through the oil cooler. I am putting words in his mouth, but I believe this is what he meant.
07-24-2009, 01:56 PM
#30
Its good information for people that newly rebuilt engines but 75% of us have for the most part factory engines. so the tolerances have maybe worn a little. i was told 20w 50 But of course i live in TN (as of right now) and it freezes maybe 10 days a year. I would still be very hesitant with 0w40