Aviation oil versus other oils

[Mooneymite]

Not sure what all the fast talk means, but it looks like aviation oil is "not like the others".

 

[toto]

I don’t know anything about oil, but I did watch the video

Seems like the aviation oil is the very best at evaporative loss, but near worst at wear protection. Since they tested XC, it would be interesting to me to know how the XC would do if you dumped some Camguard in there. 

[N201MKTurbo]

Aviation oils are AD (ashless dispersant) oils. 
 

Auto oils are not meant to be burned. They know that aircraft engines burn oil. 
 

Auto oils have an additive package that contains metals (zlnc) and other additives that will leave ash deposits when burned. These ash deposits can build up-in your combustion chambers and exhaust valve stems. These deposits can cause stuck valves and pre ignition. 
 

Most of the deposits in our cylinders are from our fuel, an amaglum of lead bromide, carbon and lead oxide. Some of the lead oxide can get reduced to pure lead, which you can see as shiny balls in your spark plugs. The shiny lead is a thin layer over the lead oxide. You can see that if you bust up one of the balls.

[Pinecone]

1 hour ago, toto said:

I Since they tested XC, it would be interesting to me to know how the XC would do if you dumped some Camguard in there. 

Camguard does nothing for friction or wear.   It only provides additional corrosion protection.

[Mooneymite]

Certainly seems, despite other attributes, that aviation oil is grossly overpriced!

[toto]

4 hours ago, Pinecone said:

Camguard does nothing for friction or wear.   It only provides additional corrosion protection.

https://aslcamguard.com/aviation/

[Pinecone]

Interesting.

Because it does not cause issues with Continental starter adapters, which the Lycoming anti wear additive does.

[Fly Boomer]

12 hours ago, Mooneymite said:

Certainly seems, despite other attributes, that aviation oil is grossly overpriced!

To some extent, it's about numbers.  For every quart of aviation oil, there are a million quarts of car oil.

[A64Pilot]

Aviation oil is more similar to two stroke oil than Auto oil. 

Having said that our engines aren’t hard on oil, they run at low speeds, have truly large bottom end bearings, don’t run that hot most often, turbo’s being the exception and have very short change intervals.

I’m sure much better oil could be formulated, just the money isn’t there.

 

 

[Will.iam]

On 1/26/2025 at 10:41 PM, Pinecone said:

Interesting.

Because it does not cause issues with Continental starter adapters, which the Lycoming anti wear additive does.

Actually when i first put in cam guard my starter adapter started slipping could have been coincidence, but I think my adapter was already worn out and that just accelerated the problem. Since i put the overhauled starter adapter i have continued to use cam guard and the adapter has not slipped since the overhaul. 

[cliffy]

I mentioned this somewhere else but in a couple of months there is a utube channel "The Motor Oil Geek" that is going to put

out a video or 2 on aviation oils. He is a degreed Lubrication Engineer and has many many videos on car engine oils and additives

He does it all from a scientific stand point with nothing to sell

You might want to check his channel out   I find it very informative.