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1970 era small block 350. Not exactly sure of the internals but it was rebuilt in the mid 1990's for drag racing. I do not use the car to drag race any longer but certainly don't baby it. I was thinking of going with the SAE 30 oil they have.

Does anyone have any experience / feedback with Brad Penn - Penn Grade 1 high performance motor oil?

Does anyone have any experience with Driven Racing Oil from Joe Gibbs Racing? It supposed to be specially formulated for classic cars and hot rods to protect internal parts with high levels of ZDDP. Also, because these cars are not daily drivers, it also claims to delivers storage protection...

I have a small block 350 in my car. Based on casting #'s (3970010) and engine code (V0806TXB) the block is from 1975. The cylinder heads (333882) are 1.94 intake, 1.5 exhaust and match the block. I know these heads are prone to run hot because they are lighter and have a double heat-riser but...

I have a small block 350 in my car. Based on casting #'s (3970010) and engine code (V0806TXB) the block is from 1975. The cylinder heads (333882) are 1.94 intake, 1.5 exhaust and match the block. I know that GM started making hardened valve seats for unleaded fuel in 1971 but the guy who built...

Here are the pics again:

I don't have specific sites to reference as I did not save them. I was surprised by the negative Amsoil comments but I did see them on two different sites and just thought I would ask here.

Is anyone else having problems viewing the pictures. I checked them again and they seem to be fine. Regardless there was no hint of sludge so I am not concerned about that as an issue now though I do plan to switch to a detergent oil. Just not sure which one yet.

I could not wait so I pulled a valve cover off tonight. Here is what I found: My guess is this looks so good because the car has not been driven that much while on ND oils.

Unfortunately I do not know why the ND oil was used. The guy who built the engine was my buddy's dad. He knew what he was doing when he did it but rarely remembers why now. He gave the car to my buddy (his son) and told him that is what he used. I got the car from my buddy three years ago and...

The engine is a 1969. The car was used for drag racing for the last 15 years and I suspect that is how long the non-detergent oil has been used. That said it was trailered to the track and has had minimal miles put on it in that time. I have been using non-detergent oil for the last three...

I have a Gen I Chevy Small Block 350 in my car and the previous owner was using NAPA NON-DETERGENT SAE 30 motor oil in the car. I have continued to use this oil since that is what has been in the engine prior to my ownership but I am curious what others use in this vintage motor?

Thank you for all you insight Jim. I get where you are coming from on the additive and will wait and see how it goes on oil with the additive built in. I have settled in on the Valvoline High Performance 80W-90. I took an closer look at the Amsoil study and took out the scores for all of the...

I completely agree with you about the fact that the study was conducted and presented by Amsoil. I am not saying it is not "true" but it has to be viewed under the premise that the "best" oil is made by those doing the testing. Thanks for your insight about the ACDelco oil. I figured it would...

This is what I have on GL ratings from an old thread posted on this forum years ago: GL-4; Specified for hypoid gear service under severe service but without shock loading. This classification is essentially obsolete but is still specified by some manual transmission/transaxle manufacturers...

I had settled in on the Valvoline 80W-90 after I realized the ACDelco was only GL-4. I live in western PA but I am not concerned about cold weather performance because the car goes in storage for the winter. I am not sure what posi gear is in the car because I have never had the cover off. I was...

Thank you Jim. The rear gear has been changed out in my Monte Carlo and I believe it is an Eaton posi which is why I was relying on their specs. I also am not too interested in the synthetic because of the potential for chatter due to the different friction characteristics and because I know...

Thanks OneEyeJack. These were good reads but they both point me back to synthetic gear oils. However, Eaton (the likely manufacturer of my GM differential) still specs mineral oil for their differentials. Also, I have a hard time trusting any testing conducted by a manufacturer when their own...

I have a GM 7.5/7.625 10-bolt limited slip differential in my 1981 Chevy Monte Carlo and I am in the process of swapping out the differential cover and replacing the gear oil. I have a Gen I Chevy small block 350 with a TH350 transmission in the car and the previous owner used to drag race the...