The Mobil 1 guy told me today Mobile 1 is good to 470 degrees F while
organic motor oil breaks down at 270 F.

Paul Lamar

Speaking of Mobil One, how often should I change the oil?
With Pennzoil I was changing the oil at 50 hours, I've got
about 60 now on the Mobil One.

Racing Beat recommends maximum oil temp into the engine
210 degrees.  What determines this temperature, the oil
scraper rings?  Something in the engine itself?  (I don't have
the book in front of me).  Would Mobil One allow you to
run higher oil temps (even though you may not want to)?

--
Perry Mick
Duckt N7XR
http://www.ductedfan.com

Good question.

That could be any one of a number of things. It could be the stock
oil-control rubber O-rings or it could be just to
cool the rotor and main bearing material. On the other hand the apex
seal runs up there around 500 degrees F so it could be to enhance
the heat transfer between apex seal/rotor and oil. Next time
I am talking to Jim Mederer I will ask him this question. Also
once we get some experience with the teflon seals and high oil temp
perhaps we will find out what the real number can be. Chuck Is building
an engine with the teflon oil control O-rings. In theory these should
be good to 500 degrees.

BTW the guy said 7000 mile oil-change for Mobil One in a car.

Paul Lamar

Paul,

I change oil in my car each year when getting my yearly inspection.
Have been using Mobil 1 for over thirty years.  Did a valve job on my 626
some years ago
and the mechanic who did the grinding for me asked what type oil I used
as the valve stems were and guides were worn less than .0005.  This was with
113000
miles on the car.  He immediately switched to using Mobil1 in his
vehicles.

I will not say I'm using it in my 0-235 since new.

Fly fast, land slow.
Bill

I think due to its higher temp capability it would be ideal for valve
guide lube. Here is that valve temp chart again. Course auto engine
valves stems run a lot cooler than aircraft engine valve stems.
That is one reason they don't cost $100 to $300 EACH!
It is a wonder to me air craft engine exhaust valves last
as long as they do.

Paul
 
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