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  #1  
Old 04-23-2023, 10:56 PM
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Default Castrol GTX Classic High Zinc

Anyone using this stuff? Seems like it might be a good alternative to the Valvoline VR1 Racing Oil that I have been using for years at a much lower price point.

https://www.amazon.com/dp/B09QXWLY2Y...t_details&th=1

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Old 04-23-2023, 11:13 PM
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I’d definitely consider using some if they didn’t only offer it in 20w-50, now if they had 10w-30 and I’d be a buyer.

I searched through their store and didn’t see anything other than 20w-50.

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Old 04-24-2023, 10:39 AM
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Tim Corcoran Tim Corcoran is offline
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Brad Penn makes a great oil that contains the upgraded ZDDP additive package required for flat tappet cams, racing applications and it comes in 10-30, 10-40 and 10-50 viscosities and you can even get it on Amazon.

This is slightly off topic, but it seems many people in the classic car/street rod world use thicker oil, i.e., 10/40 or 10/50 viscosity thinking it's better somehow. Your oil viscosity is determined primarily by your bearing clearance. Unless you have opened up your clearances then your much be better off with sticking to 10-30 oil. Your oil is a big part of your cooling system and if your oil is too thick you won't get enough flow across your rod and main bearings and the bearings can overheat and could even lead to failure if your hot rodding the engine, plus you might not get enough oil to the top end to lubricate the valvetrain components and to cool your valve springs. In a racing application bearing clearances are opened up and a thicker oil is recommended.

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Old 04-24-2023, 10:46 AM
Steve C. Steve C. is offline
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To mirrior Tim's post....

At one time we were using Valvoline VR-1 10W-30 oil.
In communication with a Valvoline Tech Rep he said clearances under .0025" they did not recommend 20W-50 oil.



.

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  #5  
Old 04-24-2023, 11:21 AM
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I'll also second Tim's post. I've always used Brad Penn (now called "Penn Grade") in my GTO. Just got a case in from Amazon and did an oil change a couple weeks ago. Yes, it's still green in color ...

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Old 04-24-2023, 11:50 AM
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i have used this oil. no issues to report at this time, however, a second hand report of someone who stopped using it because it turned brown too quickly for them. I dont have alot of miles on the motor i have used it in, but castrol used to be pretty good, A quick internet search indicates that many oils change colors as the additive package sees some engine temp without any change in properties. i Also like rotella, or amazon high mileage in 10/40, but you hear differing opinions on that too. In my high rpm combo i use mobil one

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Old 04-24-2023, 01:57 PM
Dragncar Dragncar is offline
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I would run that stuff in my old 455. But it had ,0035-.004 on the mains when built.
New engine is getting this, not cheap but about as good a oil as you can get.

https://www.amazon.com/Schaeffer-Man...NrPXRydWU&th=1

  #8  
Old 04-24-2023, 04:07 PM
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I recommend Lucas hot Rod oil in all the builds that leave my shop. Viscosity depends on clearances.

https://lucasoil.com/hotrods-classic-cars

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Old 04-24-2023, 04:55 PM
tjs72lemans tjs72lemans is offline
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I broke my engine in on Brad Penn and used it for one oil change. Then the machinist who did machine work and ran it on his dyno changed to Driven. So, that's what I use now. Not sure why he changed brands. I also use 10-30.

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