oil change interval?

[dieselwagen]

i switched to synthetic last oil change
how long can i use the synthetic (oil change interval)
on a daily driven 1.6 non turbo

[burn_your_money]

I'd like to know as well. I've heard 5k (kms) because of the soot content but I've also heard 10k (kms) because of the better suspension qualities of the synth.

When I switched to synth on my TD I was told to drop the pan after the first oil change to verify that it had not loosened any crap and was clogging the oil pump pickup screen. I installed a windage tray at the same time. There was nothing in my screen at all

[dieselwagen]

thanks for the reply, i'm happy if i could push 8000 miles on the synthetic
i'm into 2000 miles on the synth oil and the dipstick still as clear
as the day i changed the oil..hopefully i'd be reaping the benefits
of the stability of synthetics on my NA, sure this is more critical
on TD engines since turbo shares the same oil.
someone on this forum says he collected hairballs on
his oil pick-up screen :shock: scary stuff right there.
i plan on dropping the oil pan for pick up screen insp. next oil change

[the caveman]

I usually use this rule. After 5000 kms i start to check the level. Once the motor starts consuming it, it's time to change it. I find this works for synthetic. Don't ask me why i do it this way, i just figure that once it's being consumed, it's not doing it's job  anymore. I use[d] this rule for my 2.2 l 1971 beetle, my now sold 98 TDI jetta and now my 91 1.7l NA Transporter.

[DonGTI]

still as clear as the day i changed the oil...

Clear oil on a diesel... has the engine been rebuilt recently??? mine's almost black after just cranking the engine following oilchange

[dieselwagen]

still as clear as the day i changed the oil...

Clear oil on a diesel... has the engine been rebuilt recently??? mine's almost black after just cranking the engine following oilchange

my car used to be like that, one time i even did 2 oil change in a row to be disappointed like the oil never got replace, so i used engine flush to clear oil passages and galleys from sludge.

engine has not been rebuilt. before i used synth, my oil will darken after one week, the engine will start sounding different after 3000 miles or so, and after 4000 miles i drop 1-2 MPG.

[jtanguay]

http://www.fs2500.com/video.html

check that out if you want clean oil  :wink: you could probably run 25'000km oil changes no prob with this (i'll be running around 50'000km when i install mine).  check out the oil analysis papers they have too... simply amazing!

i believe amsoil has a decent bypass filter as well now...

[Vincent Waldon]

still as clear as the day i changed the oil...

Yeah, all kidding aside... this is actually strikes me as strange.  Not sure how you would investigate further... but this is definitely not "normal"... whatever that means.

If the oil isn't grabbing all the soot and combustion byproducts that are a normal part of how a diesel engine functions.... and holding them harmlessly in suspension...  where are they going ?   :shock:

 Yet another VW mystery  :wink:

[burn_your_money]

i believe amsoil has a decent bypass filter as well now...

That's what I'm buying at the end of the month if I can afford it

[jtanguay]

i believe amsoil has a decent bypass filter as well now...

That's what I'm buying at the end of the month if I can afford it

bypass filtration just makes sense.  why let the oil accumulate the damaging soot particles and let the motor run like that for 1000 or more km's?  sure you get the protection you need after you change the oil, but then it just gets dirty again as always and repeats the damaging cycle.  

i'd like to see how you hook yours up when you get it!

and about the oil turning black right away, that isn't always the case.  i've run those engine cleaners for 5-10 minutes, then drained, and i must say that the oil on the dipstick was never cleaner.  stayed clean for a few days too!  then started getting black again.  i think the real reason the oil turns black so fast is just because of the residual carbon that sinks down into the pan.  some synthetics do a great job of suspending it though.  to me, it's hard to think that just running the motor for a few km's could dump enough soot to blacken the oil like that.  unless you're running wayyyy overfueled.

[dieselwagen]

synthetic oil is awesome, not going back to regular anymore.
regardless of how good any oil claims to be, eventually it will accumulate contaminant and the oil filter can only contain xx amount before showing signs of clogging / flow restriction or both, then some oil filter got by-pass to allow continued circulation, suspended metal particles which are allowed to circulate at this point that bothers me.

it has been 2200 miles and the synth oil is not exactly clear anymore, its only  holding clarity far longer than the regular 15w-40 i was used to.
i read from another forum re: used oil analysis. not sure how much they cost, maybe i'll spend $$ to replace the oil filter instead after 5K - 6K miles and try for at least 3K more before next oil change.

the FS2500 is nice, but damn i'm so poor otherwise i'd get that and a Giles super pump.

[Rat407]

In diesel's clean oil is important. Cummins did a study on oil and filters and determined that the soot is a major problem in wear. They found that by controlling the soot in the oil then you could run the oil longer. This is why running a bypass filter system on a diesel works so well over a gas engine.

I know that AMSOIL's new EaO filters are really efficient and keep the soot level down longer than any other filter.  Our little 1.6L diesels take the EaO39 oil filter.  My oil analysis on my 91 Jetta TD while running the EaO39 over the Mahle OC51 showed a reduced amount of soot in the analysis.

If anyone is interested in a filter or oil, let me know. I can give you a price quote to your door. I just need a zip code.

[fdnyguy]

I dropped Royal Purple in mine, and it has been black since the first time I checked my oil.  Only 4.5 quarts.

Used Shell Syn Rotella in my F250 (16 quarts) and was clear for over 7000 miles.

Next oil change does one recommend engine flush first?


Thanks. Stay well.

[VW_Commuter]

If you want to know how long you can run between oil changes send a sample off to Blacksone Labs and have them do the Dyson Analysis which will tell you how long you can run a given type of oil before you have depleted the additive package.  If you get one of those bypass filter kits, either AMSOIL or the one from Filter Solutions, and can keep the oil relatively clean of soot then you will dramatically reduce the wear on your engine as Rat407 said but you will also save money which with the current price of diesel I know we all are trying to do.

[jtanguay]

i've been running the EaO filter in my '92 jetta and don't see too much of a difference between the bosch filter...  twice as expensive too! but then again much of the soot is smaller than 15 microns.  that'll be for my fs-2500 filter