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Topic Review (Newest First)
Today 12:19 PM
rebelx So, we're still good with the synthetic blend over full synthetic, right?
Today 09:55 AM
sailor I only considered them as "reports" with substantiating information, repeated similar results/usage patterns that add up/that sort of thing.

I've also seen reports of not triggering until well after 10k, if at all before a change is done. Factory rules suggest change anyways at 10k/1 year, even if the monitor doesn't suggest it yet. CYA for a reset in error or even a system failure. 1 yr. by time is a common recommendation, I can remember BMW Cycles that were on a 5k/6 mo. maximum requirement (and that was exceptionally high mileage as a result of their design at the time).

Failure to reset only results in a shorter change warning, don't see the issue there if followed. If it's silly short you can always revert to a time/mileage recommendation.

I'm not a fanatic for long OCI, often did my own at spring/fall just to make sure it got done regularly.

On the other hand, I learned a lot more about extended intervals from commercial driving with trucks. At the extreme, when using a bypass filtration system in addition to the stock system along with regular oil sampling, you can go indefinitely without a full oil change - just do the filters and make up oil at the regular change intervals and send out the samples for recommendations. That catches more developing issues before they become serious than doing a full change at the regular intervals, and will let you know before required if a full change is warranted. Those typically go a million miles or more before their first full change once broken in and converted to that system.

Most fleets go to a quarterly service interval for the oil/filter service at 25-30k miles, instead of the 15k often recommended. I used that for my own along with some oil analysis to back it up, the change from that was going to monthly (7.5k+) lube jobs & inspections (a good hint I picked up to eliminate many possible repairs).

You can't transfer the mileage recommendations from trucks to cars, but the proportions work similarly. That's evidenced by the longer factory recommendations seen now. 5k becoming up to10k for regular use without "severe duty" situations thrown in. Not that extreme considering 7.5k was often recommended on straight Dino oil for many cars a long while ago now.

I wonder how long a car could go on an Amsoil dual bypass filter setup with regular filter changes/oil analysis at 7.5k intervals. I'd bet on virtually unlimited miles there without a "full" change.

P.S. - I'd prob. do a 7.5k change on a MkIII, just to schedule easier, unless a warning popped up.
Today 08:40 AM
Originally Posted by sailor View Post
I've actually seen reports here of IOLM recommendations as short or shorter than the max. severe duty interval by that general set of recommendations. 5k or less for City use/short trips.
Reports or anecdotes? I have also seen anecdotes of the IOLM never triggering at all. Did you consider the possibility that the IOLM in your example was never reset on the previous oil change and the owner only thought it had fired at an actual 5k miles?

In fairness, you posted a quote that would appear to be from me but is not mine. You must have copied and pasted that from Ford's page. I did not say anything about extensive idling or short trips. I am fully aware of those parameters of the IOLM algorithm.

I am not willing to trust a "dumb" algorithm based IOLM with my engine. And argue all you want, if it isn't actually sampling the oil it is "guesstimating" at best. And let's not forget the owner or tech who fails to reset the IOLM after an oil change rendering it inaccurate. Ever seen reports of that happening?

For the life of me, I do not understand why you or other long OCI guys are determined to eek every little bit of TBN out of a crankcase of oil when even synthetic is cheap insurance for the life of the engine. Environmental concerns? Recycle.

Today 01:27 AM
Towing or carrying heavy loads
Idling extensively or driving at low speeds for long distances
Driving in dusty conditions
Driving off-road frequently
Just for fun, I'll throw a few comments on IOLM vs. the severe duty reduced interval conditions quoted from that link for when to drop to a 5k interval (2008+).

1. Covered to a large extent by the IOLM comparison of miles driven vs. fuel consumed. Focus isn't recommended here for towing, but putting a similar load in it and running up & down large hills covers similar driving. IOLM will reduce miles to recommended change.

2. Definitely covered, IOLM does this one better beyond the recommendation by reducing distance to change based on short trips/not fully warmed up as well.

3. Got me here, though it only matters if it's so dusty that you're changing filters as often as oil. (rough rule of thumb)

4.Seldom applicable to a Focus, see #3.

I've actually seen reports here of IOLM recommendations as short or shorter than the max. severe duty interval by that general set of recommendations. 5k or less for City use/short trips.

If you've got good reason to think a shorter interval is needed, I certainly won't argue it. However, the IOLM is a pretty decent algorithm now as it takes a LOT into account - not a simple system at all. If it was only considering mileage and start cycles, it would be a lot less useful as a guide to oil change frequency.
Today 12:42 AM
Originally Posted by sailor View Post
Geez, that's just a general recommendation for ANYTHING made after that year (2008) vs. prev. to that year.

Continue reading and they give info. on the IOLM, but forget to include the 1 yr/10k max. in the Focus manual for MkIII types with that system.
If you read, it also states the IOLM is algorithm based and thus samples neither the oil nor the environmental conditions the vehicle is operating in.

The IOLM would not have a clue if you were:

Towing or carrying heavy loads
Driving in dusty conditions
Driving off-road frequently

The "general recommendation" takes these less typical driving conditions under consideration.
Yesterday 11:24 PM
sailor Geez, that's just a general recommendation for ANYTHING made after that year (2008) vs. prev. to that year.

Continue reading and they give info. on the IOLM, but forget to include the 1 yr/10k max. in the Focus manual for MkIII types with that system.

You could also grump that it isn't accurate for some cars older than 2007, go back far enough and the 5k recommendation is excessive miles between changes. (Model T or A anyone? How about the flathead V8?)
Yesterday 04:24 PM
Fabio0716 You go with what is in writing. If you pull out your owners manual and it says 10K max then that would be your max oil interval. What holds up in court or any actual factory warranty case is your printed owners manual

Sent from my SM-G900P using FF Mobile
Yesterday 03:31 PM
Originally Posted by wavsine View Post
Actually, Ford issues conflicting information about oil change intervals. The owner's manual says when the IOLM alerts or 10k/1 year max. But Ford's general recommendation for cars built after 2008 is 7500 miles/6 months if driven under typical conditions or 5,000 miles/6 months under less typical conditions:
Looks like they need to conclusively put something together, then. I recall the handbook saying up to 10k/1yr and the site you linked says 7500/6mo.
Yesterday 02:34 PM
felixthecat Basically seems like ppl w/foci's are going to change out their oil/filter when ever & use what ever oil & filter. So to sum it up, ppl that know & care about vehicle maintenance know better & some don't.
Yesterday 12:01 PM
leavingmarks At a little over 7k since last change. Will probably change the oil out right before our road trip to Maine in July.

Sent from my iPhone using FF Mobile
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