oil change

jim beam · Jul 7, 2004

Bill said:

I think that's as much of a function of getting a diesel engine to start
quickly.
Click to expand...

not really an issue with direct injection - which these larger engines
have. it's the small engines on cars with indirect injection that have
a problem starting without preheat.

jim beam · Jul 7, 2004

Caroline said:

When someone produces a trial which at least attempts to do what CR attempted,
then I'll pay attention to such statements.

In other words, got anything better?
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there's the manufacturers own tests - i really can't recall what they're
called - something like phase 1, phase 2 , etc. i'll dig it up some
other time.

truth
is, the majority of wear /does/ occur on cold start,
Click to expand...

This is believable.

and truth is, n.y.
taxis run pretty much 24/7 - there are no owner operators afaik.
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I don't think this is the truth. If it is, you can find a citation for it.

Fewer taxis are needed at night, for one. The city does regulate how many taxi
licenses are issued, for another.

Also, there are owner-drivers. In addition, taxi drivers may lease their vehicle
from the owner.

See http://www.schallerconsult.com/taxi/taxi2.htm#primary

also, it's interesting that despite the significant advances in
lubricant technology since the 50's, people still talk of the 3000 mile
change that was necessary back then! modern multiweight dino oils, with
highly stable dispersant, detergent & antioxidant [among many other]
properties are vastly different to the simple gummy acid-prone stuff
used back then.

some further things to think about:

1. on the taxi 60k mile test, the wear definitions are not shared with
us. /any/ engine is going to be well within manufacturer wear
tolerances by 60k in this day & age. if manufacturer tolerance was the
definition used, it's a not going to prove a thing.
Click to expand...

Of course it proves something: Changing oil every 3k miles in these taxi cabs
appears to be a waste of money, as no differences were detected when the oil
was changed every 6k miles.

Also, you're neglecting that this is 60k miles of city driving. That's severe
duty.

You can claim CR didn't use appropriate tolerance tests, but you haven't
produced a shred of proof of this.

I am not claiming CR is always right. I am saying simply that the article is
"somewhat helpful."

It does, after all, support your own contention that a 7500 mile interval for
normal driving is fine.
Click to expand...

we agree caroline - the "3000 mile rule" so often quoted is pointless
for modern lubes.

Sean Dinh · Jul 9, 2004

Neither..
I change the oil when I feel like it. Currently, it's 12 kmiles since last oil
change. My oil light is blinking during hard cornering.

oil change

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