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A 5-7CFM is about the minimum to get by with occasional use. Ive had a craftsman of that capacity for over 20 years. When it dies I will be getting one with about 15CFM, but I use air tools. Check out https://www.californiaairtools.com very quiet and not too expensive if you stay small. The...

Thank you I hadn’t considered the effect of positive displacement. Would a radius on the oil holes work to enhance oil flow or does it end up changing the “head” pressure, if you will. I’ve read that a little bit of radius on the pump outflow can enhance flow, albeit the cost of incremental power?

How is the oil system itself accounted for? Flow rates, for example. What if anything can account for the finish in oil passages with sand cast? Are they just over sized or machined? I would guess they are sized for a viscosity range. Do the oil holes for rods or mains act as orifices, that is...

Even with after run cooling the biggest differential in turbocharger life is the operator. There is no oil spec that will fix that. Coolant cooled bearing are start.

That book is a treasure I'm sure. His discussion of trend analysis was clearly written and digestible.

Thank you.

No. The engineers have their discussion and recommendation which are available in the owners manual. Wouldn't someone going outside their recommendations have an analysis to share?

https://www.machinerylubrication.com/Read/1318/tribology-lubricant-selection I guess I have my expectations set different. The above was sort of what I thought I would find. A discussion of how surface defects and boundary layer friction affects viscosity choice, for example. Something with a...

Hah hah! Now that's the BITOG I've come to expect. One of the problems these days is discerning where the engineering stops and the regulations begin. I see a lot of comments like, I'd feel better about this or that oil. Which of course is just opinion. Thats quite a bit different than having...

Interesting perspective. Aren’t we all type 1 until we see the price tag? ;) As for number 2, every commercial aircraft you’ve ever ridden on was serviced like that. They have an exceptionally safe accident per mile operation.

Decision Process I read this on another thread and thought it provides insight to a design process. Perhaps even a cautionary tale before selecting a non approved oil.

As Yogi used to say, when you come to a choice of oil with short OCI, take it.

What you use off road is of no concern to the EPA, you could use Castor Oil if you thought it was prudent. Since grade is an engineering trade off it should be changed thoughtfully. Although it is the presence of clean oil oil that is primary with grade and brand as far secondary considerations...

I see that is what you were referring to. That is not operational guidance. They are using that number as an example only.

The Corvette manual offers operational guidance. That doesn’t exist in my Highlander manual, that I can find. If the later discussion about oil in general is the basis for thinking one can use their judgment to decide a different oil is better then Toyota could easily deny a warranty claim. They...

It is likely standard language across manuals. Manuals in aviation are updated by the page. The language is therefore generic and hasn’t been updated. This is not meant to be operational guidance. That is given elsewhere.

Ok I found the same language in mine. That is sufficiently vague as to be construed as an example rather than guidance. That is, although a higher viscosity may be used in an example vehicle, the previous page clearly states that recommended viscosity is 0w20. Is there any Toyota clarification...

Thank you for the debrief.... The bearings mentioned make your point clearly. FWIW Toyota makes no mention of a heavier oil choice on my 2019 Highlander. I am still left with unease at people choosing what part of the manufacturers recommendations to ignore. Regulatory requirements aside oil...

https://blog.amsoil.com/what-happens-if-i-use-the-wrong-weight-viscosity-of-oil/ I’m not advocating Amsoil but they give some illustrations about what happens when using wrong viscosity.

Different grade infers different clearance. It seems straight forward. I’m willing to be educated and my engineering degree occurred decades ago. Overkill was replied to.