From: HLS on 30 Nov 2008 10:50
"Mark A" <someone(a)someone.com> wrote in message news:0clYk.1725
> I also had an edger with a Briggs and Stratton engine and the oil turned
> black after one use. I knew immediately that the Briggs and Stratton
> engine I had then (don't know about newer ones) was not suitably built for
> synthetic oil (in the same way those Chevy Caprice and Crown Vic engines
> used in NYC taxis are not suitable for synthetic oil).
Mine was a B&S too, Mark.. The engine was ruined in short order.
From: HLS on 30 Nov 2008 11:09
"Ashton Crusher" <demi(a)moore.net> wrote in message
> That has nothing to do with what's optimum, it's just what everyone
> already knew, that automakers call for change internals that are way
> too short for today's oil. Nothing is provided showing just what
> mileage is truly optimum. You are right back where you started.
Wouldnt you guess, Ashton, that the automakers are covering their
rears on this? If you tell someone he can run the oil for 15,000 miles,
he may do it, and there can be eventual warranty implications. It
sounds like a policy decision rather than a technical one.
Lots of manufacturers (foods, for example) put "use by" dates on their
products NOT because the products are bad after that time. It relieves
extended product quality warranty questions, I guess.
From: SMS on 30 Nov 2008 11:14
> "SMS" <scharf.steven(a)geemail.com> wrote in message news:3OzXk.8376
>> Most any oil can do 10,000 mile in terms of providing lubrication.
>> Synthetics become acidic, and eventually become saturated with
>> suspended soot particles, just like regular oil. An oil analysis is a
>> good investment to determine the optimum oil change interval.
>> The synthetic base stock is better for low temperature start-ups, and
>> high-temperature continued operation, such as is seen in high
>> performance and turbo-charged engines.
> Claims do not constitute proof...
These are the claims of the synthetic oil manufacturers, not my claims,
but I agree, their claims don't constitute proof. Take whatever they say
with many grains of salt, since they have a vested interest in making
these unproven claims.
It's always better to believe an unbiased source that has no interest in
selling you anything, rather than unsubstantiated claims from
individuals promoting a products without any supporting facts.
Fortunately, unbiased sources support the synthetic manufacturer's
claims of benefits for low-temperature operation, and high performance
"Does my vehicle need synthetic oil?
There is little doubt that synthetic oil offers superior engine
protection under extreme operating conditions. However, many owners may
not operate their vehicles in conditions that warrant the additional
engine protection of synthetic motor oil. For most owners,
petroleum-based motor oils are just fine. Change the oil at the
manufacturer�s recommended interval (found in the owner�s manual) and
your vehicle will reward you with a long service life.
If your vehicle is turbocharged, used for towing heavy loads, driven on
the racetrack, or operated in extreme temperatures, synthetic oil may be
beneficial for extended engine life. Each of these harsh operating
conditions demand more from your engine and motor oil, and synthetic oil
can deliver the needed protection."
Unfortunately, there has never been any basis for claims of other
benefits, such as increased engine longevity, better mileage, higher
torque, etc. In fact Redline produced a "test" where they conveniently
showed the differences between 0W30 synthetic, and 10W30 conventional.
The 0W30 synthetic had a slight advantage over the 10W30 conventional in
maximum power, torque, and lower psi, but a 5W30 conventional would have
been about equal to the 0W30 synthetic.
From: HLS on 30 Nov 2008 13:35
"Mike Hunter" <mikehunt2(a)lycos/com> wrote in message
>I find it strange that any engine that consumes four quarts of oil 5,000
>miles would even start LOL
I dont know how my killfile let this slip in, but I can tell you that XK-E
of a few decades ago routinely used one quart per 600-800 miles.
From: Repairman54 on 1 Dec 2008 07:45
1997 14hp Briggs. After dino break in has been on a steady diet of 15-50
Mobile 1 summer and 5-30 Wal-Mart synth in winter. No leaks, oil color after
season of use is markedly better than dino. Compression still the same as
I only use synth. in my air cooled motors. 15-50 is what's left of a 5qt jug
that is used in my Harley.
"HLS" <nospam(a)nospam.nix> wrote in message
> "Mark A" <someone(a)someone.com> wrote in message news:0clYk.1725
>> I also had an edger with a Briggs and Stratton engine and the oil turned
>> black after one use. I knew immediately that the Briggs and Stratton
>> engine I had then (don't know about newer ones) was not suitably built
>> for synthetic oil (in the same way those Chevy Caprice and Crown Vic
>> engines used in NYC taxis are not suitable for synthetic oil).
> Mine was a B&S too, Mark.. The engine was ruined in short order.