for the guys that are into recreational oil changing...

I have done my homework, and likely know the field better than you.[/QUOTE]

And no doubt you're also doing all of this as research for a psychology
paper.

 

How much clearer can you get than inline response to "with
conventional oil"?????
Sheesh!!!

 

That is assuming you actually GET those advantages.

But not all synthetic oils are PAO

Or a 50% reduction, to be accurate.

 

Yes, fat finger syndrome.

 

They would not oxidize as easily as the "dyno" oil, but if blowby
by-products are causing the problem the improvement from using
Synthetic - although real, would be insignificant in the grand scheme
of things. Synthetic oil will not "repair" the engine.
The synthetic would last longer than the dyno oil under the same
circumstances - but the Dyno oil would last even longer in an engine
without excessive blowby. And yes, the synthetic would likely last
even longer than the dyno under the same (better) conditions.

 

MY source is a couple mechanics who work at the local Toyota
dealerships. They have not had a SINGLE coked engine failure on
vehicles following the severe service schedule, or using synthetics on
the standard schedule.

Same with mechanics at the local Mopar dealership.

And they had a LOT of problem engines using the specified standard oil
on the "normal" change schedule. The problem is obvious - the oil not
being changed often enough for conditions.
This is NOT to say there was not a problem with the engine design that
made the operatring conditions for the oil more onerous than they
needed to be.

 

In fact, 500% difference may be totally inconsequential.

 

Or just learn to drive the turbo properly - NEVER come in off a hard
run and shut the engine off. ALLWAYS give the turbo a "cooldown
period" - either gentle driving for several blocks or a couple minutes
at idle before shutdown. The electric fan wouldn't help at all. An
electrically operated oil circulation pump and/or coolant circulation
pump would work.

 

if you're using them, how can you /not/ get them???

right. the majority sold here are in fact group III's. the next
biggest seller is group IV, pao's. ester-based motor oils are a tiny
minority.

increasing from 2ppm to 4ppm is 100%. to be accurate.

 

s.o.p. on semi's and large machinery.

 

relax. i'm just saying that in the context of the underinformed
thinking that "most" [90%???] drivers are operating in "extreme
conditions", as quoted above, you should have been specific.

 

yeah. my civic with 20k mile oil change intervals is 500% broken.

 

In case you haven't noticed. Mr. Bean is simply promoting recreational
oil an analysis.

 

Maybe the scored cam lobe in that picture will really impress Honda.

 

wow, someone actually noticed!!! 10 points.

that cam lobe got marked when i did the head gasket in a hurry and
didn't clean up - it was grit during reassembly and it's been that way
for 51k miles now. as you know if you have experience of this stuff,
for that surface with those same marks to persist this long, without
being scuffed off as normally happens, is a truly extraordinary
testament to a superior lubricant.

google this group for a longer write-up i posted a while ago.

 

Correct - and it is also in the manual of virtually every turbocharged
car.

 

Maybe some of the people following the "normal" schedule were actually
driving under the "sever" criteria. I wonder how many people actually know
what they should be following.

 

What percent of people drive under "sever" criteria? 1%?

 

Wasn't the severe schedule every 5000 miles?

Ed

 

That is not fact it is simply the story you cooked up. Regardless of
what may or may not have happened to your particular engine, it is not
uncommon to see this sort of engine damage happen to someone who
changes oil at 10000 miles and experiences a head gasket leak.

Basically what happens is the sudden introduction of a small amount of
antifreeze into the oil will overwhelm the additives in the oil that are
designed to hold small particles of dirt in suspension. When these tiny
particles that usually do no harm are no longer capable of being held in
suspension, they will agglomerate into larger particles. That is, the
tiny particles will be attracted to each other and form into larger
masses. The damage those larger particles (before they reach the oil
filter) can do looks exactly like the score marks on your cam.

-jim