From: "Marvin Kaye" <marv@lancaironline.net>
Subject: Re: [FlyRotary] Synthetic oil?
To: flyrotary
Date: Wed, 25 Sep 2002 19:55:30 -0400
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Posted for "D.R. Smith" <timepilot@earthlink.net>:

> Bottom line is that I bought some Mobile 1, 10W-30, and plan to use it in
> the car and the plane, but I thought I'd see if any of you know why Mazda
> say's not to use synthetic.

You do not say whether you plan on retaining the stock oil metering pump or
not.  If you retain the stock pump you will be injecting used engine oil into
your engine to lube the seals.  Synthetic oils burn much less readily and 
leave
who knows what behind as deposits.  A "designed to burn clean" 2 cycle oil in
the gas does a better job and is not dirty to begin with.

Most aircraft applications eliminate it as a possible point of failure,
disconnect it, and pre mix 2 cycle oil with the gas.  If so, I would stick by
what the pros in rotaries say.  Racing Beat advertises and swears by a 
synthetic
called Royal Purple, but I know they mix two cycle oil in their gas at very 
high
ratios  ... about 8 times what aeronaughts use ... because they have as a 
given
the very high output MSD ignition systems that can take it and still spark.

You will get some variance, but most pilots agree on about 1 oz. per gallon.

Break in might be a different matter ... maybe use some of the ashless
dispersant types like the Lycosaususes for a while? Change it out after 10 
hours
or so?  Only reason the piston types "break in" anyway is for their piston
rings, but I can see some benefit to mating crank (e shaft) and bearings, etc.

Good Luck