On Fri, 30 Mar 2007 09:49:46 -0500, firstname.lastname@example.org
(Brent P) wrote:
Too bad YOU cant read. What part of "I don't recommend them" do you
Actually, I HAVE had the data to back it up.
When I was Toyota service manager Toyota was recommending 5W30 oil
year round. They were replacing the odd camshaft. They were replacing
timing chains. They were having problems with timing chain tensioners
and guides. I was in conversation MANY times with the engineers, and
they said they "could not recommend 10W40 and 20W50 oils for use in
their vehicles because it would contravene the laws in place regarding
C.A.F.E." I was free to recommend whatever I wanted to recommend to my
customers as long as I did not intimate that Toyota suggested it. They
said there was no engineering reason why 10W40 and 20W50 oils could
not be used if they were changed often enough to avoid viscosity
breakdown. And guess what? NONE of my customers EVER had a camshaft or
timing chain or tensioner problem that required the engine be
dissassembled or repaired. NOT ONE. I did replace a fair number of
camshafts, timing chains, and tensioners in vehicles that had been
serviced by other dealers, following the factory recommendations. Any
question as to why my retention rate was the highest in eastern
Canada? On a 3 year weighted basis, I was servicing more cars than the
dealership had sold. That's seeing the car more than twice a year for
service when the car was 3 years old or older.(long off warranty)
Accelerated life testing was done by several customers who used
tercels for delivery service, racking up opver 500,000 in 2 years. And
by others running Hilux pickups for courier service, with about the
same mileage accumulation. And customers who commuted 160 miles a day
with Supras, and kept them for 5 years.
And for your information, I never did a BOGUS transmission flush. Did
I do transmission flushes? Yes I did - and I NEVER had an automatic
transmission failure on any of my customer's vehicles. NOT ONE. (and
no specialized megabuck equipment to do the flush either) The
transmission flushes I did were not "cash cows" - straight time and
material. (I was in charge of what was likely the ONLY non-flat rate
dealership repair shop in eastern Canada at the time.) I changed the
transmission fluid at the manufacturer's specified intervals, and
flushed to replace ALL of the fluid, not just part of it.
I had over 600 vehicles under my "exclusive" care, as well as several
hundred more that came to me for some of their service, and went
elsewhere, or did it themselves, for the rest.
That says a lot.
And what products? I've done product development too.
No, as I said YOU should follow the manufacturer's recommendations to
the letter. YOU trust the manufacturer to always do what is best for
I'll go by my experience, and my training and knowledge. Those who
know me and trust me will take my advice. They have for decades. I'm
not expecting you to.
Well, I know most manufacturers did NOT test with 10W40 and have
failures that were prevented by using 5W20.
The ONLY reason 5W20 oil saw wide adaptation in the North American
automotive market was for fuel economy reasons. The critical
clearances in today's engines are virtually the same as they were 35
years ago. Precision and finish are perhaps better today than
then,allowing nominal clearances to be SLIGHTLY closer than they were
because MINIMUM clearances have remained the same. (less "peaks and
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