What 5W-30 oil brand are you using for the 6.6L gas?

OnTheReel · November 2, 2025

17 hours ago, Grumpy Bear said:

Find and look at some Pennzoil GTL based or Shell Helix 0W40 VOA v UOA's and see how far they will shear down. GTL has a very narrow range. Something like 2 to 4 cSt.

Speaking of the devil…

Pretty funny that in order to take HTHS viscosity out of the equation he had to compare the Pennzoil 0w40 against his 5w30. An actual SAE 40 against the PUP wouldn’t have been a fair fight.

Unrelated, but it does sound like he’ll be compiling all of the data from his lab into a good resource. Think Blackstone universal average but perhaps publicly accessible and searchable? We can hope.

customboss · November 2, 2025

customboss · November 2, 2025

29 minutes ago, OnTheReel said:

Speaking of the devil…

Pretty funny that in order to take HTHS viscosity out of the equation he had to compare the Pennzoil 0w40 against his 5w30. An actual SAE 40 against the PUP wouldn’t have been a fair fight.

Unrelated, but it does sound like he’ll be compiling all of the data from his lab into a good resource. Think Blackstone universal average but perhaps publicly accessible and searchable? We can hope.

Look in comments. Your truly trying to tighten up his science and testing.

Chuck FB · November 2, 2025

1 hour ago, Grumpy Bear said:

IMHO, no. Why? licensing requirements of current oils will prohibit sufficient ZDP levels for those motors.

As far as diesel oils in gas motors.... there are some issues there as well. Under SL levels of anti-wear (ZDP)and even if one could be found it is not a ZDP is of the same reactivity; read that availability. Dispersant and acid packages are quite different.

You're going to keep asking if there is a shelf oil for a flat tappet motor with current licensing and I'm going to keep saying no. Your looking for something with a API SL/SJ rating and the only places you will find those that I'm aware of is in the boutiques. A new motor would need even higher levels and a well broken in one perhaps, maybe, would do okay on an SM oil. I wouldn't but some would, have and have gotten away with it. Ditto diesel oil. Most of those have SM levels of anti-wear.

Uh yes, progress and planned obsolescence at the same time. I was hoping perhaps the SP rated but not Dexos rated oils might be better but I was hoping for too much.

Looking at the Mobil Delvac it lists SN/SM . The no longer made Delvac Elite 222 0W-30 was SM/SL/SJ/SH which I have a few jugs left of and will make use of them until they are gone and then who knows what I should do after that, more than likely use the 0W-40 Delvac and hope for best or unless I can source a better solution at that point.

customboss · November 2, 2025

1 hour ago, OnTheReel said:

Speaking of the devil…

Pretty funny that in order to take HTHS viscosity out of the equation he had to compare the Pennzoil 0w40 against his 5w30. An actual SAE 40 against the PUP wouldn’t have been a fair fight.

Unrelated, but it does sound like he’ll be compiling all of the data from his lab into a good resource. Think Blackstone universal average but perhaps publicly accessible and searchable? We can hope.

Watch this video and realize MORE additives is not BETTER.

OnTheReel · November 2, 2025

1 hour ago, customboss said:

Look in comments. You’re truly trying to tighten up his science and testing.

And then look at the comments from the average Joe. They can’t see the forest for the trees. A good result in one platform, for one user and now everyone thinks they should run Pennzoil in everything.

58 minutes ago, customboss said:

Watch this video and realize MORE additives is not BETTER.

See above. You mean not NECESSARILY better. As in this ONE test. You know as well as anyone you can’t extrapolate a result for a single operator in one platform to make blanket statements like that. Run that same Pennzoil in a flat tappet and your cam is gone immediately. Hell, run it in a modern roller cam Hemi and your cam is still gone. Just takes a little longer.

customboss · November 2, 2025

22 minutes ago, OnTheReel said:

And then look at the comments from the average Joe. They can’t see the forest for the trees. A good result in one platform, for one user and now everyone thinks they should run Pennzoil in everything.

Lake warns of that specifically. Average Joes online seem to be unable to DISCERN.

customboss · November 2, 2025

24 minutes ago, OnTheReel said:

See above. You mean not NECESSARILY better. As in this ONE test. You know as well as anyone you can’t extrapolate a result for a single operator in one platform to make blanket statements like that. Run that same Pennzoil in a flat tappet and your cam is gone immediately. Hell, run it in a modern roller cam Hemi and your cam is still gone. Just takes a little longer.

Depends on application, environment. Did you note my succinimide comment? The need to overbase, over additize are long gone. Oversimplifying additives is a sad synergy that is misunderstood by Grumpy and others here. Not to mention “ Joe”.

A balanced formulation for a specific application is key. But that’s just too much for “ Joe” I guess.
I’m past tired of dealing with “Joe” or stiff necked internet jocks who know just enough to articulate their ignorance.

See why I left BITOG almost 20 years ago. I was SICK of corporate BS obfuscating truth. Then “Joe” , ignorant of reality and truth supports corporate greed and glombs onto the BS.

customboss · November 2, 2025

48 minutes ago, OnTheReel said:

See above. You mean not NECESSARILY better.

No I meant what I said and so did Lake. New additives don’t need large treat rates because they work better than when I started in 1978.

Grumpy Bear · November 3, 2025

10 hours ago, OnTheReel said:

See above. You mean not NECESSARILY better. As in this ONE test.

You see that all the time. Trends are friends.

customboss · November 3, 2025

13 hours ago, Grumpy Bear said:

You see that all the time. Trends are friends.

Keep in mind I did expansive testing for a long long time and what you think is low levels of additives are that way because the efficacy of most of them is higher with less/ lower treat rate.

BTW the flat tappet cam pressure wear issue is so much smoke screen for a point of view. Do I run properly additized lubes for my 1974 International D200 4X4 345 V8. Yes. It has gear drives in place of timing chain. So that’s a shear MOFO. Amsoil 10w30 sig series in there now. Valvoline VR-1 30 Straight GRADE conventional will be tested too.

There’s not a production engine out that needs high pressure wear/contact protection on the valve train in the last 30 years so why do you guys keep bringing up flat tappet cams? Smoke.

Edited November 3, 2025 by customboss

Chuck FB · November 3, 2025

38 minutes ago, customboss said:

Keep in mind I did expansive testing for a long long time and what you think is low levels of additives are that way because the efficacy of most of them is higher with less/ lower treat rate.

BTW the flat tappet cam pressure wear issue is so much smoke screen for a point of view. Do I run properly additized lubes for my 1974 International D200 4X4 345 V8. Yes. It has gear drives in place of timing chain. So that’s a shear MOFO. Amsoil 10w30 sig series in there now. Valvoline VR-1 30 Straight GRADE conventional will be tested too.

There’s not a production engine out that needs high pressure wear/contact protection on the valve train in the last 30 years so why do you guys keep bringing up flat tappet cams? Smoke.

I can answer the background to the question of the flat tappet issue and I think that will help you relate to why I have that concern and if current oils produced for modern engines will or won't protect such engines. Sticking with gas engines although I have numerous diesels that date back as well. As far as I know all these engines I list would have problems if the wrong oil was used and if a current typical SP oils will work or would damage the cam and lifters.

1941 model McCormick Deering W4 which was my dads first tractor and he bought that new when he was 16 and it came with steel wheels due to the war and rubber was for the war effort, not for farm tractors.

1950 Massey Harris 33

1961 Massey Ferguson 65

1966 GMC 930 truck with the 327

1974 ford single axle truck with whatever V8 of the day that they used ( engine and model have slipped my mind )

1976 IH 1800 tandem with 446

1976 Buick Riviera Limited with the 455

1978 Chev 1/2 ton with 350

1980 GMC 1/2 ton with 350

1986 Ford 3/4 with the 300 inline 6

( two of ) 1995 Chev 1/2 with 350

2001 Jeep TJ with 4.0 inline 6 ( my understanding is that they are a flat tappet cam design )

2003 Jeep TJ Rubicon with 4.0 inline 6

Edited November 3, 2025 by Chuck FB

customboss · November 3, 2025

8 minutes ago, Chuck FB said:

I can answer the background to the question of the flat tappet issue and I think that will help you relate to why I have that concern and if current oils produced for modern engines will or won't protect such engines. Sticking with gas engines although I have numerous diesels that date back as well. As far as I know all these engines I list would have problems if the wrong oil was used and if a current typical SP oils will work or would damage the cam and lifters.

1941 model McCormick Deering W4 which was my dads first tractor and he bought that new when he was 16 and it came with steel wheels due to the war and rubber was for the war effort, not for farm tractors.

1950 Massey Harris 33

1961 Massey Ferguson 65

1966 GMC 930 truck with the 327

1974 ford single axle truck with whatever V8 of the day that they used ( engine and model have slipped my mind )

1976 IH 1800 tandem with 446

1976 Buick Riviera Limited with the 455

1978 Chev 1/2 ton with 350

1980 GMC 1/2 ton with 350

1986 Ford 3/4 with the 300 inline 6

( two of ) 1995 Chev 1/2 with 350

2001 Jeep TJ with 4.0 inline 6 ( my understanding is that they are a flat tappet cam design )

2003 Jeep TJ Rubicon with 4.0 inline 6

RECENT key thought here. I get it. Having said that use a good lube consistent with the need.

Edited November 3, 2025 by customboss

Chuck FB · November 3, 2025

10 minutes ago, customboss said:

RECENT key thought here. I get it. Having said that use a good lube consistent with the need.

So to make sure I understand you correctly with the type of oil you mean, for example would a Mobil AFE 0W-30 have enough protection for a flat tappet cam.

customboss · November 3, 2025

16 minutes ago, Chuck FB said:

So to make sure I understand you correctly with the type of oil you mean, for example would a Mobil AFE 0W-30 have enough protection for a flat tappet cam.

Don’t know about that version but I developed this at Cummins and it would. Your tappet pressures aren’t higher than a 15 L Cummins ISX or Big Cam.
https://www.napaonline.com/en/p/VAL818289