Synthetic oil

ScottG wrote:
Further more, it does not cause "unburned fuel" to enter the crankcase.

I believe he was talking about the regen injection event which does cause raw fuel contamination of the oil. It's injected during the exhaust event so raw fuel tends to run down the cylinder and get in the oil pan.

I believe this is what he is talking about.

Passin Thru wrote:

Flows easily, therefore not recommend for use on high mileage engines; nor do I recommend using it in new engines during the break-in period because it is so slippery and dramatically limits the wearing of new mating parts within the engine.

Switching to full synthetics is sometimes not recommended for a high mileage engine that's been using conventional oils to that point. It could make a high mileage engine with seals close to leaking start leaking at that point.

But an engine that's been using a synthetic is fine to continue no matter how high the mileage gets. A buddy of mine has 275,000 miles on a '99 Tundra that's been running Amsoil for years. Oil change intervals have been annual or as high as 20,000 miles. The truck doesn't use enough oil to add between changes.

As far as break in, as others have said, many new cars come with synthetic from the factory.

I use Dino in my 2011 D'max but use Rotella Full Syn in my Kubota tractor especially for winter snow removal etc. Only takes three quarts in the Kubota. Much more in the 3500HD.

RAS43 wrote:

Passin Thru wrote:

Flows easily, therefore not recommend for use on high mileage engines; nor do I recommend using it in new engines during the break-in period because it is so slippery and dramatically limits the wearing of new mating parts within the engine. This initial wearing of parts is what makes for proper engine break-in, sealing of piston rings, mating of camshafts and lifters, etc.

You do know that more and more manufacturers are using synthetics in their engines today without issues don't you? One example is Corvette and their engines are doing great. Just saying.

Yes, this is old wives tale stuff. Engines can break in just fine with syn. oil and most exotics come with it from the factory.

Passin Thru wrote:

Flows easily, therefore not recommend for use on high mileage engines; nor do I recommend using it in new engines during the break-in period because it is so slippery and dramatically limits the wearing of new mating parts within the engine. This initial wearing of parts is what makes for proper engine break-in, sealing of piston rings, mating of camshafts and lifters, etc.

You do know that more and more manufacturers are using synthetics in their engines today without issues don't you? One example is Corvette and their engines are doing great. Just saying.

gtschulz wrote:
The newer diesel Ford and Dodge pickup trucks use an extra shot of diesel fuel into the cylinders to provide the fuel for the regen process. This process causes unburned fuel to enter the crankcase oil thus the sooting problem This also affects the oil change interval.

I'm sorry but your understanding of this system is inaccurate and your statement is the same.
These engines had multiple injection events long before DPF came along. Further more, it does not cause "unburned fuel" to enter the crankcase. Why would another event cause more unburned fuel in the CC than the first event?
The soot in the CC is not "unburned fuel" from the cylinder, it's exhaust soot from the exhaust via the EGR. In this case soot and unburned fuel are two very different things.
The soot comes from the EGR process - not form the extra injection event.
The so called "extra shot" doesn't even happen unless RPM's are quite high.

kennethwooster wrote:
Started using synthetic years ago. I was running a lot of engines on the farm. It was easier to to run synthetic as it saved labor having less changes. I did not take a chance and used oil sampling. The end result though was a lot more miles our hours on the engines. I do recommend using oil samples if you are "....

trying to push it

...."

Kenneth,

Isn't that the truth of these threads :S

Trying to push it, but then use lower spec components... :R
but again, the gap between dino and synthetic has gotten smaller, but
there is still a gap. Guess have to say 'which' synthetic vs 'which' dino

Lost on many is that some high end spec synthetic...Exotics,
Vette, etc...anyone wonder why?

Been using synthetic since was in college and one quart cost more
that my part time job's hourly. $3.50/hour and one quart was $5.00 bucks

I even use synthetic in my lawn mower, tiller, etc...with MolyB
additive. Have on all of mine and it's not the ICE that wears out on them first...

Ditto when still owned (partnered) on the boat and it's outboards.

I'd use synthetic on my 2 cycle, but a waste as it's just in there
a very short while to then be ignited

Ditto on my guns...with MolyB additives :B

Dino diesel's in my adult air guns...synthetic doesn't...any guess as
to why on the same gun? FYI, dieseling in an air gun destroys the
piston/seals/etc in a hurry

Synthetic lasts longer on my fire arms when in storage, why?

Know because if I forget to for a while, the next cleaning/maintenance
has little to NO coloration left on the cloth...dino did when I used to use dino

Bottom line: I'll continue to use it. You folks use whatever you wish

{edit}Got a couple of PMs asking why I don't use testing...I keep my vehicles
for decades. Love not having monthly payments and dislike greatly
the price of new. For the $28 bucks, it'll pay for oil/filters. I KNOW
when it's time to rebuild and many times it is a "gosh darn" gotta
rebuild...where is that catalog...

Started using synthetic years ago. I was running a lot of engines on the farm. It was easier to to run synthetic as it saved labor having less changes. I did not take a chance and used oil sampling. The end result though was a lot more miles our hours on the engines. I do recommend using oil samples if you are trying to push it.

I use Mobil-1 synthetic as a sleep aid more than anything. Every 5k in the truck, 10k in the Prius and whenever I feel like it in the Harley. What's left goes in the mower.

Isn't full synthetic oil a completely manufactured product with the round molecules?

Isn't Semi synthetic made with mineral base oil blended with synthetic oil with few round molecules?

Isn't non synthetic lube oil pure mineral oil base with certain additives to make a spec, with no round molecules?

Isn't most of the trouble with modern diesel engine lube oil contamination tied to EGR - exhaust gas (soot) recirculation back into the cylinders?

Isn't changing oil more often than necessary fun? Especially a diesel? :)

I read someplace Cummins is expected to no longer need EGR in 2016 to meet emissions due to advances in technology.