Thanks for the responses. The owner's manual is particularly
vague, "Use FCW 10W-30/40 of rated SF, SG, SH, SJ 10w-40 ". The
website specifically says no synthetics.
I'm no chemical engineer, but I don't understand the low operating
temperature issue either. That's why I asked the question, as
experience in the field (on the water!) is probably more valuable
than from the lab.--- In PortaBote@yahoogroups.com
> I would stick to the manufacturer's recommendations, but I don't
> recall seeing that in my owner's manual. I'm curious why lower
> operating temperatures would work against synthetic oils. Usually
> lower temperatures cause accumulation of water and volatiles in
> The superior additive packages in synthetics (about 10 or more
> additives) help to prevent corrosion and sludge formation. The low
> unsaturation also helps to reduce oxidation. Many small engine
> are not diligent about changing the oil regularly, so the synthetics
> can provide a margin of safety that's worth the extra cost.
> My opinion as a chemist who worked for a company that makes the
> synthetic polymer and many of the lube oil additives.
> --- In PortaBote@yahoogroups.com, "pianewman" <pianewman@> wrote:
> > Thanks for your experience. I just read on the Nissan site that,
> > because of low operating temps, synthetics are NOT RECOMMENDED.
> > I'm still within warranty, I will follow their recommendation.---
> > PortaBote@yahoogroups.com, "ronaldwf2000" <ronaldwf2000@> wrote:
> > >
> > > --- In PortaBote@yahoogroups.com, "pianewman" <pianewman@>
> > > >
> > > > > Does anyone here use Mobil 1? I'm looking for long engine
> > life, and
> > > > have used it in my autos for years with great success.
> > > > Is it too "slippery"?
> > > > Stupid (?) question re: engine oil.
> > > > > Manual says "SF, SG, SH, SJ".
> > > > > My Mobil 1 100% synthetic says "SM".
> > > > > SM supersedes all the others, right? I don't need any
> > > > special "marine"
> > > > > oil, right? I know about the viscosity/temp ratings.
> > > > >
> > > > > Thanks.
> > > > >
> > > >
> > > I've been using it in my Nissan 5-hp for 9 years with excellent
> > > results. I use it for everything - generator, power washer, all
> > > 4-cycle engines. Works great.
> > >