Using HDEO's in Gasoline Engines

Messages
1,811
Location
South Carolina
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.
 
Messages
743
Location
Sarasota, FL
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.
 
Messages
390
Location
Central Texas
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

Messages
15,392
Location
Idaho
International HEUI injection engines ring a bell for anti foaming? So many opinions and so little facts.
 
Messages
988
Location
Upper midwest
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?
 
Messages
397
Location
Missouri
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
 
Messages
743
Location
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
 
Messages
105
Location
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
 
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.
 
Top