Lake Speed Jr. ... Diesel vs Gas oils

[d00df00d]

Summary:

Diesel engines generate a lot of soot. If that soot were uncontrolled, it'd be like sand circulating in the engine causing abrasive wear everywhere. Not good. So, Diesel engine oils are loaded with detergent/dispersant additives to cope with that soot.

The trade-off is that those additives compete with the anti-wear additives. This makes the AW additives less effective.

For Diesel engines, that's a small price to pay for keeping soot in check. The overall effect is less wear.

But in a gasoline engine, which won't produce that much soot, there's no benefit. All you have is the downside of the AW additives not working as well. So, more wear. And if it's a turbo GDI engine, all the calcium that's probably in the Diesel engine oil will likely increase LSPI, which could kill the engine in a hurry.

So, if you put Diesel engine oil in a gasoline engine, OR gasoline engine oil in a Diesel engine, you're most likely just increasing wear and risk.

 

[rijndael]

I found this to be an interesting / related article. I was specifically interested in how the oil "deals with" the soot ...

https://www.oil-analysis.org/soot-when-is-it-a-problem/

One of the ways quality engine oils deal with soot is to hold the soot particles in suspension, preventing them from agglomerating or flocculating and depositing themselves on engine parts, which would lead to the build up of undesirable deposits. Special chemicals, of the type detergents and dispersants, generically known as surface active agents, associate themselves with the soot particles, keeping them in a safe condition.

 

[AZjeff]

Mobil 1 ESP X2 is Dexos D rated and meets VW 508 00 which is required in daughter's new 1.5T gas Jetta. So follow VW requirements or listen to LSJR?

 

[rijndael]

So follow VW requirements or listen to LSJR?

I think it's fair to say the video speaking in generalities rather than addressing your corner case / possible exception.

 

[Jetronic]

Mobil 1 ESP X2 is Dexos D rated and meets VW 508 00 which is required in daughter's new 1.5T gas Jetta. So follow VW requirements or listen to LSJR?

They're specifically talking about heavy duty diesel oils, ACEA A/B/C isn't that though B is meant for passenger car diesels and C is dual use. VAG specs are based off those. The oils LSjr talks about are API C and ACEA E.

 

[Pablo]

Summary:

Diesel engines generate a lot of soot. If that soot were uncontrolled, it'd be like sand circulating in the engine causing abrasive wear everywhere. Not good. So, Diesel engine oils are loaded with detergent/dispersant additives to cope with that soot.

The trade-off is that those additives compete with the anti-wear additives. This makes the AW additives less effective.

For Diesel engines, that's a small price to pay for keeping soot in check. The overall effect is less wear.

But in a gasoline engine, which won't produce that much soot, there's no benefit. All you have is the downside of the AW additives not working as well. So, more wear. And if it's a turbo GDI engine, all the calcium that's probably in the Diesel engine oil will likely increase LSPI, which could kill the engine in a hurry.

So, if you put Diesel engine oil in a gasoline engine, OR gasoline engine oil in a Diesel engine, you're most likely just increasing wear and risk.

Thanks for the summary. Giving LSJr vids a rest.

 

[fantastic]

Had another conversation recently where one was recommending an ACEA oil in an HDEO application. I tried explaining that it was incorrect but yet it didn't sink in. This video goes over sound reasons as to why you don't want to do that in simple terms. Thanks for posting.

 

[levi]

Giving LSJr vids a rest.

His caricature facial expressions and overall delivery wear thin quickly for me.

 

[AZjeff]

His caricature facial expressions and overall delivery wear thin quickly for me.

Agreed.

DO NOT watch a Doug DeMuro video.

 

[AZjeff]

They're specifically talking about heavy duty diesel oils, ACEA A/B/C isn't that though B is meant for passenger car diesels and C is dual use. VAG specs are based off those. The oils LSjr talks about are API C and ACEA E.

Thanks for clearing that up.

 

[Zee09]

His caricature facial expressions and overall delivery wear thin quickly for me.

Funny I thought the same the other day...I'm done with him

 

[jetman]

I ran "dual rated" Mobil Delvac 1 ESP 5w-30 & 40 in my gasoline NA port injected daily drivers from 2019 thru 2022. No issues. And I ran it in my high compression roller cam 1000+ hp gasoline NA drag race engines. No issues.
Here's the API, etc info: https://www.mobil.com/en-us/commercial-vehicle-lube/pds/gl-xx-mobil-delvac-1-esp-5w40

 

[joekingcorvette]

Derek in Vice Grip garage pours it in old V8 engines all the time buy it's probably because it's low cost.

 

[BMWTurboDzl]

Summary:

Diesel engines generate a lot of soot. If that soot were uncontrolled, it'd be like sand circulating in the engine causing abrasive wear everywhere. Not good. So, Diesel engine oils are loaded with detergent/dispersant additives to cope with that soot.

The trade-off is that those additives compete with the anti-wear additives. This makes the AW additives less effective.

For Diesel engines, that's a small price to pay for keeping soot in check. The overall effect is less wear.

But in a gasoline engine, which won't produce that much soot, there's no benefit. All you have is the downside of the AW additives not working as well. So, more wear. And if it's a turbo GDI engine, all the calcium that's probably in the Diesel engine oil will likely increase LSPI, which could kill the engine in a hurry.

So, if you put Diesel engine oil in a gasoline engine, OR gasoline engine oil in a Diesel engine, you're most likely just increasing wear and risk.

Wonder how the Brotella fans are going to take this?

 

[TiGeo]

Summary:

Diesel engines generate a lot of soot. If that soot were uncontrolled, it'd be like sand circulating in the engine causing abrasive wear everywhere. Not good. So, Diesel engine oils are loaded with detergent/dispersant additives to cope with that soot.

The trade-off is that those additives compete with the anti-wear additives. This makes the AW additives less effective.

For Diesel engines, that's a small price to pay for keeping soot in check. The overall effect is less wear.

But in a gasoline engine, which won't produce that much soot, there's no benefit. All you have is the downside of the AW additives not working as well. So, more wear. And if it's a turbo GDI engine, all the calcium that's probably in the Diesel engine oil will likely increase LSPI, which could kill the engine in a hurry.

So, if you put Diesel engine oil in a gasoline engine, OR gasoline engine oil in a Diesel engine, you're most likely just increasing wear and risk.

BUT MUH BROTELLA

 

[JavierH19]

I'm guessing the lack of fm in rotella contributed to it having the worst cam wear figure or no it just performed poorly for some other reason?

 

[I<3oil]

With the addition of VRP oil, it “dissolves” deposits and whatnot. I wonder if it would be good at also dissolving soot so it’s not in chunks, causing harm?

 

[scoot]

His vids are 3x longer than need be .

 

[edyvw]

Wonder how the Brotella fans are going to take this?

I was thinking same. Please no one posts this on STi or WRX forums.

 

[addyguy]

Just going to toss a wrench in here…
Years ago, Castrol was big at touting that Calcium and Sodium detergent compounds had BOTH detergent/dispersant functions, but ALSO had strong anti-wear attributes as well. They put a lot of Ca in GTX as part of this finding.
Old-school HDEO still do tend to have a fair amount of Ca detergent in them, so isn’t this wear issue mitigated a lot? Isn’t he exaggerating the ‘dangers’ a bit?