What kind of oil should I use / what is the "best" oil?

356 Porsche-related discussions and questions.
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bil brown
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Re: Dino vs synthetic oil question

#166 Post by bil brown » Sat Jan 18, 2020 6:58 pm

Hey you oil experts.....I`ve got a case of Castrol R bean oil left over from my 4cam daze......is there a shelf life?
Bill Brown

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David Jones
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Re: Dino vs synthetic oil question

#167 Post by David Jones » Sat Jan 18, 2020 7:46 pm

Just use it in the lawnmower. It will make mowing a pleasure
If I had known I would live this long I would have pushed the envelope a little harder.
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george kehler
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Re: Dino vs synthetic oil question

#168 Post by george kehler » Sat Jan 18, 2020 8:55 pm

How about Joe Gibbs Driven Racing DT-50 15W50 synthetic oil. For air cooled engines !! Am putting in my 1971 911S this week. Check out their website.
George Kehler II

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Bill Lawless
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Re: Dino vs synthetic oil question

#169 Post by Bill Lawless » Sun Jan 19, 2020 8:09 am

Don Gale wrote:
Sat Jan 18, 2020 5:46 pm

+1, My kingdom for a Pliny . . .

pliny.jpg
Nice, this is one of my favorites in VT... (Opps, how did oil discussion turn into beer discussion)
Screen Shot 2020-01-19 at 7.06.27 AM.png
Screen Shot 2020-01-19 at 7.06.27 AM.png (118.82 KiB) Viewed 479 times
https://hillfarmstead.com/awards/hill-f ... -for-2018/
 Thanks,
Bill
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65' 356 C T6 Grey
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Stephen Ross
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Re: Dino vs synthetic oil question

#170 Post by Stephen Ross » Sun Jan 19, 2020 8:40 am

FWIW I use Rotella T4 15w40 in all my pre-1990 cars now. Good oil, cheap to buy and 1200+- ppm of ZDDP.

https://rotella.shell.com/en_us/product ... ction.html
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Bill Lawless
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Re: Dino vs synthetic oil question

#171 Post by Bill Lawless » Mon Jan 20, 2020 8:43 am

Stephen Ross wrote:
Sun Jan 19, 2020 8:40 am
FWIW I use Rotella T4 15w40 in all my pre-1990 cars now. Good oil, cheap to buy and 1200+- ppm of ZDDP.

https://rotella.shell.com/en_us/product ... ction.html
Is there any advantage to running a diesel oil?
 Thanks,
Bill
65' 356 SC Cab Irish Green :D
65' 356 C T6 Grey
82' SC Targa
81 VW Westfalia with 2015 Forester Engine
BMW R50/2, 2BMW R90/6's, BMW R65, K1200RS

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David Jones
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Re: What kind of oil should I use / what is the "best" oil?

#172 Post by David Jones » Mon Jan 20, 2020 9:31 am

Yes, but mainly because the amount of ZDDP is not restricted as it is for the lower viscosity oils for gasoline engines. Diesel engine lubrication oils are formulated for higher operating temps and greater pressures.
If I had known I would live this long I would have pushed the envelope a little harder.
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Martin Benade
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Re: What kind of oil should I use / what is the "best" oil?

#173 Post by Martin Benade » Mon Jan 20, 2020 12:17 pm

There is no downside to diesel levels of ZDDP?

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David Jones
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Re: What kind of oil should I use / what is the "best" oil?

#174 Post by David Jones » Mon Jan 20, 2020 12:33 pm

Not sure what the question is Martin, but diesel oils were exempt from the restrictions on zddp levels because they were mandated for oils below 40 weight as they were considered bad for cat converters. I think the max is 800 rpm. Check the Mobil 1 chart.
If I had known I would live this long I would have pushed the envelope a little harder.
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Martin Benade
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Re: What kind of oil should I use / what is the "best" oil?

#175 Post by Martin Benade » Mon Jan 20, 2020 1:36 pm

To rephrase, is too much ZDDP a problem for a 356, or is the 1700ish ppm OK?

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David Jones
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Re: What kind of oil should I use / what is the "best" oil?

#176 Post by David Jones » Mon Jan 20, 2020 3:28 pm

OK Martin, now I understand. My reading and experience leads me to believe that around 2000 ppm would be getting to the point where the ZDDP could cause more problems than it solves. Too much causes the oil to tend towards an acidic concentration which is going to corrode some engine components. I doubt many of the manufacturers put that much in so the safe limit is probably around 2000 ppm. It would appear that only the motorcycle and flat out racing oils have over 1700 ppm. Personally I think I will avoid any more than a max of 1500 ppm and a minimum of 1200, then even if the formulation is off by 10% I still have a safety margin. For now I like the Mobil 1 at 1300 ppm which is a good median level. Even If I generate condensation in the engine there is not so much ZDDP that I will generate an acidic concentration.
If I had known I would live this long I would have pushed the envelope a little harder.
Cymru am byth
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Martin Benade
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Re: What kind of oil should I use / what is the "best" oil?

#177 Post by Martin Benade » Mon Jan 20, 2020 5:03 pm

Thank you. Sounds like a more informed choice than I could make myself.

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