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15-40 Or 20-50?

Which one do you guys use? For most of its life the receipts showed 20-50 but for the last few years with the new owner they switched to 15-40. Which one should I run with a stock motor and 60K mile engine? I was told to use Castrol GTX 15-40 which seems to be for diesel engines.
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Old 06-05-2007, 01:04 PM
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I saw you posted this same question to the Rennlist board....and I think you'll find that most of the folks end up using the Castrol GTX 20-50....not all.....but most.
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Old 06-05-2007, 02:49 PM
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Thanks Chuck It looks like I'll do the same.
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Old 06-05-2007, 02:54 PM
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I use 20-50 amsoil
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Old 06-05-2007, 04:51 PM
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930s rule the wasteland
 
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most of the heavier weights are for diesels
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Old 06-05-2007, 05:14 PM
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I use Mobil 1 15W-50.

Greater viscosity at the higher temps turbos are likely to spend their time at.
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Old 06-05-2007, 08:30 PM
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I used Castrol GTX 20-50, but recently switched to Mobile 1 15-50 full syn. Since the switch a very small leak developed that will be addressed at the next oil change. It'll be an easy fix. I switched because of the heat range as stated above. FWIW my car has about 60k on it.
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Old 06-07-2007, 06:05 AM
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Oil Viscosity

I was thinking of going synthetic but was worried about leaks. Using GTX Castrol 20W/50 now but it seems to be getting hard to find in these parts.


Cheers
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Old 06-11-2007, 11:39 AM
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Castrol 20/50 here, I'd use Kendall 20/50 but it's getting hard to find.
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Old 06-11-2007, 12:17 PM
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I went with 20-50 this weekend, thanks for all the Info
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Old 06-11-2007, 02:04 PM
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20/50 Brad Penn green oil is the best out there now...Even better than Royal Purple for our air cooled (oil cooled) engines.

http://www.lnengineering.com/oil.html
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Last edited by iamchappy; 06-11-2007 at 03:55 PM..
Old 06-11-2007, 03:51 PM
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Wo ist die Rennstrecke?
 
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OMG - not the dreaded oil debate....again...
Old 06-11-2007, 04:00 PM
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No...no more debate. He got his answer....everyone go home....
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Old 06-11-2007, 05:02 PM
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I dont think of this as a debate, just facts. I ordered cases of the Brad Penn stuff last week. Any oil will work, some are better than others. Navarro put a lot of work into his research and works with air cooled Porsche engines.
Royal Purple would be the oil I would use if I didn't go with the Brad Penn stuff, as it comes with high recommendations also.

I use Amzoil in the tranny
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Old 06-11-2007, 05:22 PM
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Quote:
Originally posted by Chuck Jones
No...no more debate. He got his answer....everyone go home....
+1
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Old 06-11-2007, 05:49 PM
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I would use fitty. Use to use Pensoil, and sold on benefit that Castrol is everywhere (slight different smell between the two). And the Castrol 50 has been very good.

Regards,
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Old 06-12-2007, 01:50 PM
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