Using HDEO's in Gasoline Engines

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Originally Posted by FordCapriDriver
Originally Posted by Building3
i just finished watching a video on the Hagerty website about Shell motor oils. Sure it was an infomercial. It was moderated by Hagerty with two Shell engineers. The engineers were adamant that Rotella T-4 15w-40 was the best oil for older cars with flat tappets, muscle cars, etc. Sure they are biased but why would they tell customers to use their HDEO in passenger car engines with flat tappets if it would harm the engines? They could have just said that they did not make oils for cars that old.
They sure wouldn't be risking openly recommending one specific oil for a certain application if they didn't believe it was a good choice. Perhaps on paper things may suggest that HDEOs can foam at sustained high revs. But i have never seen foaming with HDEO personally, i sometimes go out for a spirited drive in my Escort up the mountains, this usually means about half an hour ish of sustained 3000-4500rpm. I remember having read something about foaming with HDEOs and wanted to see for myself if the oil would foam. I shut the engine off after about half an hour of fairly high sustained revs and checked the dipstick, no foaming i could see.
In the engines that foamed, 4500 rpm was well below the converter's stall rpm. These engines live at 7000-9500 rpm with dry sump oil systems. There's a sight hole in the oil reservoir. After about 15 seconds of sustained 9000 rpm, it looked like a whipped latte in there.
 
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My built 500hp STI is very happy with HDEO (Chevron) and doesn't burn any of it, I will continue to spend less money and be happy with the performance. One of my closest friends just switched his 2018 modified STI from PCMO 5w30 to HDEO 5w40 (Rotella).. and basically it went from burning 1qt every 1500 miles... to zero burn.
 
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I thought HDEOs were supposed to have more anti-foamants in it. Can't say I remember where I saw that... I gotta say it makes no sense that they would have less. Most of them are just specialized siloxanes, right? And they only add a teeny amount of them for the anti-foaming benefits, right?
 

CT8

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International HEUI injection engines ring a bell for anti foaming? So many opinions and so little facts.
 
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Originally Posted by MrWideTires
My built 500hp STI is very happy with HDEO (Chevron) and doesn't burn any of it, I will continue to spend less money and be happy with the performance. One of my closest friends just switched his 2018 modified STI from PCMO 5w30 to HDEO 5w40 (Rotella).. and basically it went from burning 1qt every 1500 miles... to zero burn.
Are you running Delo XSP 5w-40?
 
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Originally Posted by CT8
International HEUI injection engines ring a bell for anti foaming? So many opinions and so little facts.
So problematic yet so fun
 
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Sarasota, FL
Originally Posted by Mainia
Originally Posted by MrWideTires
My built 500hp STI is very happy with HDEO (Chevron) and doesn't burn any of it, I will continue to spend less money and be happy with the performance. One of my closest friends just switched his 2018 modified STI from PCMO 5w30 to HDEO 5w40 (Rotella).. and basically it went from burning 1qt every 1500 miles... to zero burn.
Are you running Delo XSP 5w-40?
Yes that's what I'm currently using
 
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Tucson, Az
Hello! Here is a question for you. I do think your right about the if the oil specs are ok then a person could use the HDEO in a gas car. I have a 1988 Mercedes 300e with a straight six. It called for a 15w-40 oil back in the day. So could I use the new 15w-40 delvac super in the 1988 gasoline Mercedes? Keep in mind that this oil is now a syn-blend with a high TBN of 9.8. It is a very good diesel oil for my diesel cars that I have. A 1983 Mercedes 240D and a 1984 Mercedes 300SD and a 1995 Mercedes 300d. I just wanted to use one oil for all of those cars. It does seem simple enough since all of the cars owner's manual do state that a 15w-40 oil is a preferred oil for all of those cars. But, as we all know the oils of today are much better than the oils of the days when those cars were made. Anyway, what say you, yes or no? Thank You, Bill
 

FCD

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Originally Posted by billpace1956
Hello! Here is a question for you. I do think your right about the if the oil specs are ok then a person could use the HDEO in a gas car. I have a 1988 Mercedes 300e with a straight six. It called for a 15w-40 oil back in the day. So could I use the new 15w-40 delvac super in the 1988 gasoline Mercedes? Keep in mind that this oil is now a syn-blend with a high TBN of 9.8. It is a very good diesel oil for my diesel cars that I have. A 1983 Mercedes 240D and a 1984 Mercedes 300SD and a 1995 Mercedes 300d. I just wanted to use one oil for all of those cars. It does seem simple enough since all of the cars owner's manual do state that a 15w-40 oil is a preferred oil for all of those cars. But, as we all know the oils of today are much better than the oils of the days when those cars were made. Anyway, what say you, yes or no? Thank You, Bill
I think you can probably use it no problem.
 
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I suspect the OP is looking for cheap high ZDDP oil for a flat tappet gas engine. Unfortunately, the high level of detergents displace enough ZDDP molecules to render such an oil no better for ZDDP than most any regular gas engine oil with modest ZDDP numbers.
 
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Oh, it is an old thread. Sorry, I must have clicked on it under "similar threads" and did not notice old dates.
 
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I manage a fleet of delivery trucks. All but one are gas engines.
i use 15w-40 in all but one, the one that gets 5w-30 is a Ford Transit, it gets Mobil 1.
One truck has a Powerstroke. The rest are gas V8’s. They all get the diesel oil, PM’s are every 10k.
These trucks are ran hard and put away wet. They run for 8-12 hrs a day, fully loaded. Hard on the throttle.
All but 2 were brand new (2020) when I started managing the fleet.
One is closing in on 40,000 miles. The others have just over 30,000 miles. Zero issues.
I am going to do a SOS on a couple of them at 50,000 miles to see if I can go longer between PM’s.
 
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Originally Posted by The Critic
A friend of mine shared this post with me.
Thanks for sharing. I worked on class 8 diesel trucks for 30 years. I never thought diesel oil in gas engines was a good idea (although I did use it because it was free). For those who claim great UOA's, that is only showing the oil is holding up well. Not the engine. My opinion is dual rated HDEO's are either a poor diesel oil (most likely) or a poor gas engine oil.
so Delvac1300 which is dual rated is a poor HDEO?
 
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I did put Rotella 0w-40 on an outboard this past season just because I had it laying around. I can attest to the foaming issue when you check the dipstick it had lots of bubbles
 
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Originally Posted by The Critic
A friend of mine shared this post with me.
Thanks for sharing. I worked on class 8 diesel trucks for 30 years. I never thought diesel oil in gas engines was a good idea (although I did use it because it was free). For those who claim great UOA's, that is only showing the oil is holding up well. Not the engine. My opinion is dual rated HDEO's are either a poor diesel oil (most likely) or a poor gas engine oil.
That’s the biggest load of BS I have ever saw posted here.
 
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I would think that any HDEO that has an "S" spec in its rating, especially ones that have SM or newer would take into account the higher RPM ranges of gas engines and mitigate any foaming issues. Certainly when it comes to something like my Caravan which lives the vast majority of its life under 3500 RPM and the very occasional run up to 5800 when passing on a highway or having a bit of spirited fun wouldnt have any issues running an HDEO. Ive been stocking up on some 4qt jugs of Valvoline Premium Blue Extreme 5w-40 that I plan on running in it and the rest of our vehicles on their next OCI. Once is an older jug that has an SM rating, and the rest are newer with SN ratings. The newest vehicle we have is a 2006 Envoy so the SM shouldnt be an issue of any sort.
 
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I would think that any HDEO that has an "S" spec in its rating, especially ones that have SM or newer would take into account the higher RPM ranges of gas engines and mitigate any foaming issues. Certainly when it comes to something like my Caravan which lives the vast majority of its life under 3500 RPM and the very occasional run up to 5800 when passing on a highway or having a bit of spirited fun wouldnt have any issues running an HDEO. Ive been stocking up on some 4qt jugs of Valvoline Premium Blue Extreme 5w-40 that I plan on running in it and the rest of our vehicles on their next OCI. Once is an older jug that has an SM rating, and the rest are newer with SN ratings. The newest vehicle we have is a 2006 Envoy so the SM shouldnt be an issue of any sort.
The way most gasoline passenger cars are driven I doubt you'd even remotely see foaming issues anywhere near what you'd see in a marine engine that runs continually between 50%-WOT.
 
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