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  #41  
Old 07-03-2017, 07:04 PM
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RV3bpilot RV3bpilot is offline
 
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Location: New Ulm, Minnesota
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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.
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New Ulm, MN 56073
RV3b N219BB
263 hours and counting
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  #42  
Old 07-05-2017, 03:23 PM
TXFlyGuy TXFlyGuy is offline
 
Join Date: May 2012
Location: Jazz Town, USA, TX
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Quote:
Originally Posted by RV3bpilot View Post
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.
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  #43  
Old 07-09-2017, 07:02 AM
dlomheim dlomheim is offline
 
Join Date: Sep 2006
Location: (2OK2) OK City, OK
Posts: 338
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Quote:
Originally Posted by RV3bpilot View Post
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
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  #44  
Old 07-10-2017, 08:00 PM
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RV3bpilot RV3bpilot is offline
 
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Location: New Ulm, Minnesota
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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.
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New Ulm, MN 56073
RV3b N219BB
263 hours and counting
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  #45  
Old 08-07-2017, 05:37 AM
TXFlyGuy TXFlyGuy is offline
 
Join Date: May 2012
Location: Jazz Town, USA, TX
Posts: 281
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We are planning to use Shell Rotella T, an ashless dispersant oil, just like Aeroshell. It is a full synthetic.
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  #46  
Old 08-07-2017, 07:43 AM
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RV6_flyer RV6_flyer is offline
 
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Location: Uniontown, PA
Posts: 2,700
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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.
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To most people, the sky is the limit.
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  #47  
Old 08-07-2017, 08:49 AM
TXFlyGuy TXFlyGuy is offline
 
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Location: Jazz Town, USA, TX
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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.
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  #48  
Old 08-07-2017, 09:30 AM
rv7charlie rv7charlie is offline
 
Join Date: May 2006
Location: Pocahontas MS
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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.)
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  #49  
Old 08-07-2017, 10:04 AM
TXFlyGuy TXFlyGuy is offline
 
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Location: Jazz Town, USA, TX
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Quote:
Originally Posted by rv7charlie View Post
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.
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  #50  
Old 08-07-2017, 12:40 PM
jim etcheverry jim etcheverry is offline
 
Join Date: Feb 2006
Location: fresno, ca
Posts: 20
Unhappy Shell Rotella is NOT an ashless disperant

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