Best Oil for 389 Tri Power - Pontiac GTO Forum
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post #1 of 10 (permalink) Old 09-16-2014, 03:03 PM Thread Starter
 
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Best Oil for 389 Tri Power

Ready for my first oil change in my 66 tri power. I was told not to use just any oil. WHat's the best for this engine?

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post #2 of 10 (permalink) Old 09-16-2014, 03:24 PM
 
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you will get a hundred different suggestions on what oil and weights to use. just make sure you use 1 bottle of ZDDPLUS oil additive with every oil change to make your oil have an SF rating to protect your cam n lifters. Im a Pennzoil guy using 10w-40 in my 389. NOT synthetic, but that's just me.
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post #3 of 10 (permalink) Old 09-16-2014, 03:33 PM
 
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Try BradPenn High Performance. Already formulated for engines without cat. converters. No additives to worry about.
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post #4 of 10 (permalink) Old 09-16-2014, 07:17 PM
 
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Brad Penn Oil

Quote:
Originally Posted by ibarbuckle View Post
Try BradPenn High Performance. Already formulated for engines without cat. converters. No additives to worry about.

I agree with this.

When I had my all-original 389 in my 66 rebuilt, it was done by the gentleman that built the winning engine for the 2002 Daytona 500. He worked for Bill Davis Racing until such time as the team was shut down. After that, he opened his own shop and started building (and rebuilding) engines for muscle cars, hot rods, street rods and classic cars.

He highly recommended the Brad Penn oil and used Brad Penn for the break-in oil.

Here's a link to their website : Welcome!

I have no affiliation with Brad Penn, but there is a lot of good information on their website. They operate the former Kendall / Amalie Refinery in Bradford, PA.

As mentioned earlier, their oil has ZDDP, essential to engines like our 389.
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post #5 of 10 (permalink) Old 09-17-2014, 05:55 AM
 
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I agree with these folks - Brad Penn. Matt

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post #6 of 10 (permalink) Old 09-17-2014, 11:04 AM Thread Starter
 
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Thanks all!! Brad Penn it is!

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post #7 of 10 (permalink) Old 09-17-2014, 01:54 PM
 
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Amsoil Z-Rod is another one; I run that and Brad Penn in my vintage vehicles. The Amsoil has some very good corrosion inhibitors in it.


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post #8 of 10 (permalink) Old 07-06-2015, 04:49 PM
 
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I am in the same situation with how to work with this GTO I recently bought. The manual indicates that the tri-power should use only 30 weight. This is not easy to find anymore. Can a multi-grade be used and what weight should it be?
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post #9 of 10 (permalink) Old 07-07-2015, 05:49 AM
 
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I think that everyone has their own idea but let me add my 2 cents worth. If the manufacturer states 10w30, then use it. I've been using Castrol GTX High Mileage for years with no problems. I substitute a quart with Marvel Mystery Oil (its been around for a long long time), change the filter and add ZDDP. For about the last 10 years I've used a filter magnet-it attaches to the filter and traps microscopic metal from moving around the engine. It's called Filter Mag. Just go online and read about it. Good luck!
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post #10 of 10 (permalink) Old 07-09-2015, 03:17 PM
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10w30 with a ZDDP additive is just fine. I too agree that the Brad Penn oil is excellent. Been running Rotella in mine for years, though. The main thing is to not use racing oil, and to stay away from 20/50. Racing oil is not formulated for street use (missing the additive package) and 20/50 is too thick for non-worn-out engines.
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  Pontiac GTO Forum > The 1964-1974 Pontiac Tempest, Lemans & GTO > 1964-1974 Tempest, Lemans & GTO General Discussion

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