Phosphorous

[woxofswa]

I've had 5 oil analysis's done on my engine. The first three by one vendor and the last two by a different vendor. (Lab one).

On the first three there were no reports of phosphorous, but on the last two, they were 15 and 20 respectively. The oil has always been x/c 20/50 since break in.

All five have been deemed to be "normal".

The lack of a phosphorous report on the first three could just be that the first lab doesn't scan for that.

I'm just curious if any of the brain trust might know how phosphorous finds its way into the oil and what it is a sign of if it gets a high reading. Thanks in advance.

[moosepileit]

http://www.avweb.com/news/savvyaviator/190242-1.html

For example, I recently got back a report from Blackstone that showed a big jump in phosphorus levels from what I'd been used to seeing. That concerned me for a moment (what the heck does phosphorus mean?) until I realized what was going on: Turns out that my local oil jobber had run out of Aeroshell W100 oil, so I wound up using a few quarts of Aeroshell W100 Plus as make-up oil. The main difference between W100 and W100 Plus is that the latter has an antiwear additive called triphenyl phosphate (TPP), and that's what was causing the higher phosphorus numbers on my oil report.

[DanH]

Originally Posted by moosepileit

The main difference between W100 and W100 Plus is that the latter has an antiwear additive called triphenyl phosphate (TPP), and that's what was causing the higher phosphorus numbers on my oil report.

Good to know. Also, the MSDS for Camguard lists unnamed "phosphates? as a trade secret ingredient.

[Captain_John]

I remember chatting with Paul from AeroShell and discussing certain additives and ingredients in oil.

As I recall, phosphorus is added in varying amounts to all blends of oil to mitigate corrosion. It serves as a sacrificial element.

The addition of phosphorus is one of the biggest things that makes aviation oil different from automotive blends. The phosphorus will ruin a catalytic converter in short order.

Don't worry about those levels in your analysis. It probably didn't come from your engine.

CJ

[woxofswa]

Thanks to all for the great info

[NYTOM]

Originally Posted by DanH

Good to know. Also, the MSDS for Camguard lists unnamed "phosphates? as a trade secret ingredient.

Dan just wondering here, how much Camguard do you use ( if you do indeed use it) and do you add any between changes. Don't want to highjack the thread but of all I have read on the subject Camguard seems to be the best additive out there.

[vic syracuse]

Not to answer for Dan, but I add camguard at every oil change when using Aeroshell straight weight or Phillips X/C. The Aeroshell Plus already has it included, as already noted.

I do not add Camguard until the engine is broken in, usually around 100 hours to be sure. They specifically caution you to not use it on new engines until break in.

Vic

[NYTOM]

Originally Posted by vic syracuse

I do not add Camguard until the engine is broken in, usually around 100 hours to be sure. They specifically caution you to not use it on new engines until break in.

Vic

Thanks Vic. Good to know. I'm about to break the engine soon and considering its cost I want to treat it like gold.

[DanH]

Originally Posted by NYTOM

Dan just wondering here, how much Camguard do you use ( if you do indeed use it) and do you add any between changes. Don't want to highjack the thread but of all I have read on the subject Camguard seems to be the best additive out there.

I did a little homegrown corrosion test a few years back, and was not convinced that Camguard added anything in that regard. I don't know much about their anti-wear additives, as they are proprietary. Opinions will vary, but independent facts are scarce.

Anyway, I'm flying Aeroshell W15W-50 semi-synthetic. Here's the official doc:

http://www.shell-livedocs.com/data/p...c41767f853.pdf

[NYTOM]

Originally Posted by DanH

Anyway, I'm flying Aeroshell W15W-50 semi-synthetic. Here's the official doc:

http://www.shell-livedocs.com/data/p...c41767f853.pdf

Thanks Dan. I ran Aeroshell W15w-50 semi-sym in my last plane with zero problems. I guess I'm searching for that miracle additive ( that probably doesn't exist) that's going to make my engine last forever.