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Question What are the chances of the car starting to leak if switching to synthetic oil?



I don't run my car hard at all so figured conventional oil was fine, but think synthetic would be a better choice. The only thing is, being an older car, I'd hate for it to start leaking. Anyone here tried the same thing with any success?

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82 Porsche 930 Euro, black, 31K miles.
Factory stock other than k27 turbo, B&B headers, GHL exhaust, Tial F40, 1 bar wastegate, MSD 6A ignition, 8" and 9" Fuch upgrade, H4 Xenon headlamps and a 930S steering wheel.
Old 05-09-2013, 07:53 AM
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Yes, I switched.... and now it leak's. Going back to Rotella non-synthetic next oil change (i think). Synthetic is just to thin.
Old 05-09-2013, 08:08 AM
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Mine is still relatively leak free but for one valve cover gasket that I'll replace anyway at next valve adjustment. For as many miles are on her, I'm quite happy. Like you, though, I would be concerned with changing to synthetic for that reason alone.

Personally, I feel that good high quality dinosaur squeezin's are fine oils for 'regular duty' driving, provided you get an oil formulated with as much ZDDP as you can find to be cam and rocker friendly. The only drawback is that non-synthetic oils are prone to coking in the turbo. We should all - myself included - consider installing a filter on the return line from the turbo to catch those little particles before they get back into the engine.
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Old 05-09-2013, 08:21 AM
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2+ years ago I switched from kendall 20w50 to rotella t6 5-40. Car started much easier in the winter, oil pressure not so high on startup and only small leaks for 3 oil changes in 18 months. I did the autozone deal on valvoline VR1 20w50 and as soon as I switched the car started running hotter and leaking more.

Circumstantial evidence I know, but my car didn't leak when I switched to the t6, and it did start leaking more when I went to non synthetic.

I suspect in my case the oil is irrelevant. I'm going back to t6 because the cold startup is easier.
Old 05-09-2013, 09:03 AM
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what about mileage? higher miles = greater chance of leaks, but whaet about a low miles car?
mine has 44k on it and about 4k on a top end "re-seal". i too have been considering this but when i switched on my 77 i had to change the name of the car from elvis to the titanic.
(since the car was so cool and elvis died in 77, i figured it was him reincarnated).
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Old 05-09-2013, 09:27 AM
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I havent change on a 911 before but I did on my 944 back in the day and Yes its started to leak. The car did start easier and rev smoother but leaks!!
Also, my mechanic has stated many times that he has increased cam wear on cars that have switched to synthetic.
This debate will go on for years, personally I am going to stick with what the car was designed to use.
Old 05-09-2013, 11:16 AM
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On older cars like ours i would stick with the regular oil with a nice zddp content(btw i run the reactors that make ZDDP). I run Valvoline VR1, no oil leaks.
Old 05-09-2013, 11:31 AM
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Quote:
Originally Posted by speednme1 View Post
On older cars like ours i would stick with the regular oil with a nice zddp content(btw i run the reactors that make ZDDP). I run Valvoline VR1, no oil leaks.
VR1 20/50 for me as well.

Hey, do I hear a possible source for the good stuff - Zinc Dialkyl Dithio Phosphate -you being the reactor man and all?
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Old 05-09-2013, 11:42 AM
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In a couple of words: very high.
Old 05-09-2013, 12:07 PM
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Quote:

Quote de speednme1



On older cars like ours i would stick with the regular oil with a nice zddp content(btw i run the reactors that make ZDDP). I run Valvoline VR1, no oil leaks.

VR1 20/50 for me as well.



Hey, do I hear a possible source for the good stuff - Zinc Dialkyl Dithio Phosphate -you being the reactor man and all?
Lol...right now we sell 3 different grades. Zddp is a great additive. It should work well on our older engines. Our newest grade helps to keep phosphorous levels low as it exits your exhaust, as emission regs get tighter this will be our main seller.
Old 05-09-2013, 12:17 PM
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I run synthetic in mine. No leaks, 52k miles. I have driven it around 6k miles in 2 years with it. Next oil change will be at Brumos in Jax so I will get some feedback there I am sure.
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Old 05-09-2013, 03:47 PM
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Originally Posted by Miguel Antonett View Post
In a couple of words: very high.
Agreed!
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Old 05-09-2013, 05:20 PM
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runnin mobil 1 15/50 change every 3k religiously
Old 05-09-2013, 05:52 PM
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Coked oil is potential disaster. As they said above, stick with real oil.
If you must use pretend oil, install a filter between the scavange pump and tank to keep this out of your engine ...



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Old 05-10-2013, 04:16 AM
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I have an '82 turbo with 160,000 kms. It was resealed at 142,000, and so far no engine work, and not enough oil burned between changes to notice. Mobil 1 synthetic 20/50 changed every 4.000 kms (2500 miles). Not a drop of oil under the car. There had been a small drip on one of the heat exchangesr from the valve cover but gaskets were changed during the winter valve adjustment and so far so good. I don't track the car. I have heard that synthetic contains detergents that may create problems, and have also heard that dino oil causes cokeing. The more reading = the more confusing this topic becomes.
Old 05-10-2013, 05:32 AM
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Any of you run Brad Penn?
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Old 05-10-2013, 06:17 AM
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2nd change with Brad Penn oil. Seems ok but im still going back to regular Rotella.
Old 05-10-2013, 10:56 AM
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wow, that looks nasty! I need to do some more research I guess!
Quote:
Originally Posted by billjam View Post
Coked oil is potential disaster. As they said above, stick with real oil.
If you must use pretend oil, install a filter between the scavange pump and tank to keep this out of your engine ...



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Old 05-10-2013, 11:27 AM
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I'm certainly no oil expert. Synthetic oils are great..might be a little too great for our older girls who have not had a recent rebuilt. If your engine has not been apart or since it's last rebuild you have been using regular oil, IMO I would stick to the regular. Synthetic oils along with its detergents may loosen some crud that conventional oils may not. This may cause unwanted coaking throughout certain areas of your engine. Synthetic oils extend oil intervals. Regular oils with zddp(gotta stay employed..jk..) are a great option for us. Zddp was first introduce in aviation. It has excellent metal to metal wear. So to summarize my opinion...if your engine is being rebuilt or has had a recent rebuilt, synthetic might be a good idea. The rest of us may want to stick with conventional oils.
Old 05-10-2013, 01:17 PM
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Motorcycle Oil | Mobil 1 V-Twin 20W-50

Old 05-10-2013, 01:40 PM
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