Mixing Differential fluids 75W-90 and 75W-110

[kschachn]

Engine metalurgy matters to oil formulation. That is why sometimes we have specific oils for specific engines. One of the many reasons I should say.

Can you explain that? What are the metallurgy differences that specific oils address?

I'm not sure how that would work, if (for example) an oil with an API SP license was inappropriate for some specific engine due to the different metallurgy of the engine, wouldn't that be a problem? Or if for example, an oil with VW 504 00 approval would be inappropriate (or even damaging) to another specific engine?

I've never seen how an oil is specific to a specific metallurgy.

 

[lakestone]

Can you explain that? What are the metallurgy differences that specific oils address?

As an example I was thinking of plasma spray cylinder liners, nikasil, good old iron liners, and so on. ZDDP won't cling to all of them the same way, detergents won't work all the same way. Lubricants change with how engines are built.

Also, Lake Speed Jr. said that engine metalurgy matters when formulating motor oil. It was in one of his more recent videos.

 

[kschachn]

As an example I was thinking of plasma spray cylinder liners, nikasil, good old iron liners, and so on. ZDDP won't cling to all of them the same way, detergents won't work all the same way. Lubricants change with how engines are built.

Also, Lake Speed Jr. said that engine metalurgy matters when formulating motor oil. It was in one of his more recent videos.

I’m not seeing that. My old BMW had an Alusil block and before that it was a Nikasil coating. Neither required a special oil, the problems with Nikasil had nothing to do with the oil. The oil used in that engine was fine for use in an iron block or with iron liners, or vice versa. Same for today’s engines that have coated bores. Do those have specific oil requirements related to the metallurgy? What is the requirement?

I’ve never seen where lubricants change with the way an engine is built metallurgically. That sounds like a disaster waiting to happen.

 

[lakestone]

I’m not seeing that. My old BMW had an Alusil block and before that it was a Nikasil coating. Neither required a special oil, the problems with Nikasil had nothing to do with the oil. The oil used in that engine was fine for use in an iron block or with iron liners, or vice versa. Same for today’s engines that have coated bores. Do those have specific oil requirements related to the metallurgy? What is the requirement?

I’ve never seen where lubricants change with the way an engine is built metallurgically. That sounds like a disaster waiting to happen.

I'll look for the video and post it back here.

 

[kschachn]

I'll look for the video and post it back here.

Well I’d rather you explain it since you’re the one who made the claim.

 

[Glenda W.]

We’d certainly see the metallurgy test sequences in the approvals and certifications. Using the “wrong” oil would be disastrous….

 

[MolaKule]

As an example I was thinking of plasma spray cylinder liners, nikasil, good old iron liners, and so on. ZDDP won't cling to all of them the same way, detergents won't work all the same way. Lubricants change with how engines are built...

Where in the technical literature does it say that the chemistry of ZDDP or detergents doesn't work the same way in any engine of any metallurgy?

I have yet to find any information to support any of your comments.

 

[lakestone]

Where in the technical literature does it say that the chemistry of ZDDP or detergents doesn't work the same way in any engine of any metallurgy?

I have yet to find any information to support any of your comments.

I'm gonna plead the fifth and invoke my right to talk non-sense with enthusiast-related non-sense with the same enthusiams only a hobbyist can have. What I previously stated was stuff I picked up from various YouTube videos, like the one bellow. It's a discussion board filled with various passions, oppinions, and the occasional jabs.

Rather than videos, it would be better if you explained your technical understanding in your own words. Individuals can goggle those oft repeated videos (found in other threads) on their own if interested.

 

[MolaKule]

I'm gonna plead the fifth and invoke my right to talk non-sense with enthusiast-related non-sense with the same enthusiams only a hobbyist can have. What I previously stated was stuff I picked up from various YouTube videos, like the one bellow. It's a discussion board filled with various passions, oppinions, and the occasional jabs.

The above is repeated text from previous posts.

Place use quotes around others' comments or better, use the "Reply" function to show others' text.

https://www.grammarly.com/blog/punc...rks/?msockid=3ba18cbd4ee563811b9e9f584ff76226

Example: "Rather than videos, it would be better if you explained your technical understanding in your own words. Individuals can goggle those oft repeated videos (found in other threads) on their own if interested." MolaKule

Here is some software for spelling and grammar checks:

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[MolaKule]

Please make your statements above make sense.

They are instructions on how to properly quote others' text and how to clean up your comments so they are readable.