Mobil One, Anyone?

[RV3bpilot]

I have used both Mobil one synthetic and Now Amsoil synthetic with no adverse affects and I use 100LL all the time, no auto fuel.
No sludge build up. Oil stays clean for a long time after I change it. I change oil every 50 hours.
I use 10w-30 synthetic.
There is no way I would use anything other than synthetic with a turbo charged engine because synthetic oils can handle much higher temperatures.

[TXFlyGuy]

Originally Posted by RV3bpilot

I have used both Mobil one synthetic and Now Amsoil synthetic with no adverse affects and I use 100LL all the time, no auto fuel.
No sludge build up. Oil stays clean for a long time after I change it. I change oil every 50 hours.
I use 10w-30 synthetic.
There is no way I would use anything other than synthetic with a turbo charged engine because synthetic oils can handle much higher temperatures.

Thanks. That is good to know. Real world experience trumps theory every time.

[dlomheim]

Originally Posted by RV3bpilot

I have used both Mobil one synthetic and Now Amsoil synthetic with no adverse affects and I use 100LL all the time, no auto fuel.
No sludge build up. Oil stays clean for a long time after I change it. I change oil every 50 hours.
I use 10w-30 synthetic.
There is no way I would use anything other than synthetic with a turbo charged engine because synthetic oils can handle much higher temperatures.

Robin: Aren't you running your RV-3B with a GM/Opel "ECO" Engine?

thx.

Doug Lomheim
RV-9A, Mazda 13B / FWF

[RV3bpilot]

It's a Corvair engine modified to run in the aircraft. A very smooth running 6 cylinder engine.
With a turbo I have about 125 hp.

[TXFlyGuy]

We are planning to use Shell Rotella T, an ashless dispersant oil, just like Aeroshell. It is a full synthetic.

[RV6_flyer]

Here is an article written in 1995 about the results of Mobil 1 Aviation Oil.

There are more stories but this one was the first one found with my search engine.

[TXFlyGuy]

Here is what can be learned from this...do not use Mobil One in an aircraft engine, Lycoming, Continental, etc.

They are built with extremely loose tolerances, which results in far more "blow by" than you will ever have in a modern automobile engine.

[rv7charlie]

While what you say about LYC/CON is true, that's not at all what I learned from this. My memory of the early problems with synthetic oil was that they couldn't/didn't hold the lead byproducts in suspension, so they accumulated in the engines as sludge.

Synthetic oil in a LYC/CON would be fine, as long as you're running lead free gas. (Temps shouldn't be an issue; synthetics have much higher heat tolerance than organic oils.)

[TXFlyGuy]

Originally Posted by rv7charlie

While what you say about LYC/CON is true, that's not at all what I learned from this. My memory of the early problems with synthetic oil was that they couldn't/didn't hold the lead byproducts in suspension, so they accumulated in the engines as sludge.

Synthetic oil in a LYC/CON would be fine, as long as you're running lead free gas. (Temps shouldn't be an issue; synthetics have much higher heat tolerance than organic oils.)

That is why we have chosen an "ashless dispersant" oil, Rotella T, by Shell.

[jim etcheverry]

Shell's entire line of Rotella is a "low ash" oil. Not an ashless dispersant.