Am I pushing Mobil1 5w30 over it's limits @ 6000miles?

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626LX2.0LATX1998

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I have Mobil 1 5w30 Supersyn in my engine with 6000 miles, 4 months. Car has 76kmiles.
Manual says OCI of 5000 miles/6 months severe, 7500miles/12months normal service. Did 5000 mile OCI last time with same oil.

Car has no oil consumption. Engine is quiet. Oil has seen the early winter weeks of March. Oil is dark brown. Darker than last oil change. Filter is Fram Tough Guard (grey can).

Can I push the oil to the 8000 miles? or am I risking engine damage? If so, I'll just go switch back and do 5000 mile OCI using OEM mazda oil 5W30 and OEM filter. UOA is not an option for me.
 
If your car is being driven in reasonable conditions, then you should be able to run it a lot longer than 6K. Think about this...the Mobil 7500 is a synthetic blend and is guaranteed for 7500 miles. The regular Mobil 1 (full synthetic) should be good for at least that many miles if not more. I am running mine out to 10K.
 
Heavens no!I run 15,000 in way different applications and never a problem in 694,000 miles. The closest application to your is a 2004 Honda Civic VP. I just ran the oem fill (conventional oil ) 10,000 miles as per owners manual and shop data. I switched over to Mobil One 0w20 and after the break in and meager warranty will have no concerns about 15,000-20,000 mile OCI's. Again if you have any do a few oil analysis to see how your engine trend lines are going and secondarily how the oil is holding up.
 
My answer is the best.... lol ...8K with a Motorcraft/AC Delco would be a better choice. Put a new Fram on it now & add one-third qt. top-off.... run it another 2K. If you switch to Mobil-1 EP next time, take it to 10K with a filter change in-between.
 
Since UOA is not an option. I would limit it to 7,500 mi.

To me, UOA is more to evaluate engine health than to determine oil quality.

Without uoa, we make the assumption that you have perfect engine health and that your air filtration is working very effectively, etc.

Going far beyond 8K is possible with excellent results and little risk, but without at least one UOA, I wouldn't.

You can probably get 15K out of Mobil 1 EP, but I would want the comfort of knowing my engine had no issues.

I probably wouldn't run the tough guard beyond 6 months. So 6 months or 8K seems reasonable on this combination without UOA to support.
 
The current Mobil oil ad campaign here is: 5k with Mobil dino, 7.5k with syn blend, and 15k with Mobil 1 full syn- gaurenteed. I do concurr with the above. Remove the Fram and replace with a better Motorcraft or AC Delco filter. Fill new filter 1/3 with oil and then top off the crank case after the change over. IOW, I wouldn't trust the Fram's cardboard end caps to last for these extended OCI lengths. They could collapse.
 
I think, given your climate, that you'll end up with a 6 month OCI ..or perhaps a bi-annual OCI weighted shorter during the winter. There will be no "pushing" involved.
 
So I should feel comfortable taking it to 7500mile OCI as long as I don't pass 6 months (FRAM filter limit).

So do I just ignore the color of Mobil 1 5w30 supersyn oil and just merely check if the oil level is good until I reach the 7500 mile mark? Does the color indicate anything?
 
Pay the extra money to get something other than a Fram. Wix should be available somewhere nearby. Don't worry about oil color. Additives routinely, in most oils, turn dark with mere appliaction of heat.

I would naturally recommend UOA. I would think with your driving routine (apparently 18k a year =6k/4m X 3) that you have to be doing a whole lot of highway driving. This doesn't stress oil much at all. You just have to index the months one way or the other to balance (or not) out the fatigue that the winter puts on it. So, and assuming that you determine this through UOA, you may be doing "early spring/late fall" OCI. 5m/7m type thing. I do, however, think that 6 months for a synth would be just fine under just about any situation.
 
Just get a Supertech filter. Better than fram, and for less $$$!
smile.gif
 
If your car has hydraulic valve lash adjusters, it needs clean oil to prevent them from getting sticky and causing valvetrain noise at startup. Cheap oil changed often is one way to do this.
 
I've made it simple in all my vehicles changing every 6 months or 7500 miles unless it's run under special conditions. I've had UOA's of Schaeffer's PAO Blends run out to 7K miles and they were fine. Mobil 1 should hold up somewhat better too.
 
quote:
Originally posted by haley10:
Since UOA is not an option. I would limit it to 7,500 mi.

To me, UOA is more to evaluate engine health than to determine oil quality.

Without uoa, we make the assumption that you have perfect engine health and that your air filtration is working very effectively, etc.

Going far beyond 8K is possible with excellent results and little risk, but without at least one UOA, I wouldn't.

You can probably get 15K out of Mobil 1 EP, but I would want the comfort of knowing my engine had no issues.

I probably wouldn't run the tough guard beyond 6 months. So 6 months or 8K seems reasonable on this combination without UOA to support.
Click to expand...
Couldn't agree more. Why is a UOA not an option?? You can do a Butler UOA for less than 10 bucks. Cheap and it lets you know if your engine has any issues.
 
Without UAO,
dunno.gif


From all I've gathered from this board and a few others...I'd personally buy a different make of filter.

Are we talking about M1 EP or the non-EP version of 5w-30? I believe the commercial refers to the M1 EP as the 15k/1 year OCI oil. I could certainly be wrong.

ruking77 - It may be true that an oil doesn't wear out, but it's additives do/become depleted, as well as there being fine particulate build up that may be said to pose a sand blasting effect. Are you using a by-pass filtration unit or just having to replace enough as you go to keep all within reason? Sorry if I missed this.
 
"Manual says OCI of 5000 miles/6 months severe, 7500miles/12months normal service."

The writer of your manual is not assuming you will be using Supersyn. They must assume many owners will be using the cheapest dino oil they can buy. Yet, they have determined such can safely use the OCIs indicated.

Now, here you are, using a very high quality synthetic product that can handle extremes that cheap dinos would be "hard pushed" by. Even though I like UOAs you should experience absolutely no problem with the intervals indicated, unless you have something like a coolant leak into the oil (this is where UOAs saved me from a destroyed engine before it was too late).

I would at least go with a Super Tech oil filter.
 
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