Anyone else on Mobil1 having to add oil between oil changes? My oil change interval is 4000M (6000KM) and I typically have to add betwen a half to a full quart at the 2000M mark. I couldn't find any results searching, maybe I'm using the wrong lingo. I've only got 20000 miles on the car.

i use Mobil1 and change my oil around 3500. i never have to add anything to it. i would say its because your changing at 6000 but that wouldnt make sense if your adding more around 2000. and a full quart at that!?? something doesnt sound right, sorry i couldnt be of more help. it'll be interesting to see what others say.

Last week I added a full quart and I'm about 2000 miles from the last oil change. I'm in Canada so I've converted the distances for your commenting pleasure. And no its not leaking on the garage floor.

I finally found the right search combination. It appears that Mobil 1 has a tendency to disappear, be consumed, etc.

I'd guess it has more to do with the break-in and individual traits of a particular engine than the type of oil used. I've used only Mobil 1 since ~10K miles (I'm at 50K now) and it has never used any perceptible amount of oil, and I pull the oil dipstick at every fill up. My change intervals are 4 mos or 4K miles, whichever comes first...usually mileage.

I'm running 5w30 all year round. I'm going to switch to a heavier weight for the summer.

I use Mobil 1 5w30 year round, change at ~7,500mi intervals, no untoward consumption between changes.

I change my oil with M1 every 4k miles - I buy the 5 qt jugs from Walmart and after I drain my oil I place my used oil back into the empty 5 qt jug - almost without fail ~4.1 qts out for every 5 qts in.

Note: I've been running M1 ever since first oil change at ~1200 miles.

Mine eats a little...not enough to alarm me. Just keep an eye on it and top up as necessary. I switched to synth at 9,000.

Even though I have a 2.5l, you might find it interesting that I had the same problem, with around the same amount disappearing. I don't like that, and so switched to a blend: zero consumption now.

As I drive pretty hard every day, I would like to use synthetic. I posted on www.bobistheoilguy.com my experience and asked for recommendations. It seems that Mobil1 5/30 is a very thin 30w, hence the burned oil. Some suggested trying Mobil1 10/30, saying that it will not burn nearly as much. Some suggested staying with dino (regular) oil because from all the evidence of the Used Oil Analyses posted by Subaru owners the Subys are amazingly easy on oil and show very little wear regardless of the oil used (given regular oil change intervals-Castrol GTX, Pennsoil, and Chevron supreme were the dinos with the best results). A couple others have had great results with Redline, one guy using a redline 5/40 with 8000k oil change interval, great lab results, and a suggestion from the oil analyst to go to 10,000!

From the testimonies about Redline, I am tempted to try it and send in a lab sample at 6000 or even 7500.

If anyone cares, I have heard Subaru didn't endorse the use of synthetic for a long time, but finally changed that, whether from consumer pressure or a change in the formulation of synthetics. SubySpecialties in soCal doesn't recommend synthetics at all, for what it is worth...

Mine was burning a quart of Mobile1 about every 4K miles. I switched to 5W-30 Redline and now burn about ½ a quart but I’ve also been able to increase my change intervals to 6k+ without the oil being any noticeably dirtier or having any other problems. IMO, the Redline’s worth the cost.

Anyone else on Mobil1 having to add oil between oil changes? My oil change interval is 4000M (6000KM) and I typically have to add betwen a half to a full quart at the 2000M mark. I couldn't find any results searching, maybe I'm using the wrong lingo. I've only got 20000 miles on the car.

Yup. Same thing - about 2K. It's happenned since 10K and it happens now at 52K. Reminds me - I need to change my oil!

I change every 4k at the moment with M1 5w30. That'll be rising to every 5k or perhaps more when I start commuting longer distances to work.

I burn about a 1/2 quart every 2000 miles. Nothing alarming. The S2000 uses about the same amount running M1 10w30.

My car consumed Mobil 1 5-30 like water... since I switched to 10-30 for the summer months, no problems yet... although I did just get back from Boston so I'll have to check the oil tomorrow at work in the level parking lot.

-Jason

I switched my WRX at 640 miles, using the 5W30 Mobil 1. Between then and the first 15K, it used 1/4 qt. every 2500 miles. At 15K, switched to Redline 5W30 and now it uses hardly a dribble between changes. Also noticed better oil pressure and a little more induction howl :devil: with the Redline. Don't ask me why but it is there. More expensive but a truly great oil for the Rex. Mobil 1 is still a fine choice though, and more economical--I agree 10W30 is best for the summer months.

Oil consumption will vary slightly from motor to motor but, I feel that the run it like you stole it folks during breakin are the most hurting. My 72,000 mile Forester used 4 oz between 5,000 mile changes (mobil 1 5w30). My other two friends Subys used maybe 8 oz per 6,000 oil changes. From my experience if you don't race and don't constantly use engine breaking that any oil consumption over about 1 quart in 4- 5,000 miles has a problem.

Try Castrol GTX 10W-30. I used to be an avid Mobil 1 user until I discovered oil analysis. Castrol GTX will make your car run smoother, quieter, rev faster. Your oil consumption is likely to decrease. Most significantly, your engine wear will go right down to almost zero.

Castrol GTX 10W-30 now carries ACEA A1/A5 rating in Canada and ACEA A1 rating in the US. As far as I know, it is the only non-synthetic oil in N.A. market that has this advanced rating.

Hey, vvk, youre on BITOG, right?

What does that ACEA rating mean exactly?

I may try the GTX, or Redline. I can't decide which way to go. What is your OCI with the GTX, vvk? Which air and oil filters do you use?

> Hey, vvk, youre on BITOG, right?

That's me :alien:

>What does that ACEA rating mean exactly?

Did you want details? :devil:

ACEA -- Consumer Information (http://www.acea.be/ACEA/20020618PublicationsOilSequences.pdf)

ACEA specs (PDF) (http://www.infineum.com/information/gaseng2002.pdf)

> I may try the GTX, or Redline. I can't decide which way to go.

Redline is more or less boutique oil. They use some unusual additives and their oils can produce some unusual oil analysis results. I know some people swear by it but I remain skeptical :rolleyes:

> What is your OCI with the GTX, vvk?

3 months, which works out to 4k-5k miles for me.

> Which air and oil filters do you use?

Subaru OEM. They are the best. Especially the air filters. They use oiled paper filtering media and are of much superior construction compared to aftermarket air filters.

:lol: BITOG is a mind-f**k:lol:

Um, yeah, details...Uh, thanks :lol:

Yeah, I saw some good uoa's with Subys on Redline. $7.50q is a lot.

I think I will be ditching my K&N for an Air filter from the dealer. Don't think I'll give up my amsoil oil filters though...

My '02 WRX has always consumed synthetic oil, anywhere from 1 to 2 quarts per 6,000 miles. I switched at 8,000 miles after 3 oil changes with regular dino oil. I was very gentle with it during breakin, and now typically drive 50 miles a day, highway speeds (50-80) to work, and average about 25K miles/year. Each engine will consume oil differently. Ideally they should not consume any oil, but I will say that go to WOT several times each day. So basically I look at it as the more aggresive that I drive the car, that the rings, and valve seals and guides are allowing oil in to the combustion chamber when I go to WOT. One of the interesting things to notice (especially if you have an oil pressure gauge), is that the oil pressure baseline goes up, almost 10PSI, between dino oil, and the synthetics I have run, Mobil 1, and Motul 6100, and 8100.

For those who have consumption with Mobil 1 5w-30, you may give Mobil 1 10w-30 a try. Their 10w-30 is a bit more shear stable than their 5w-30 and should help a bit. With a synthetic 10w-30, there is no problem with cold start unless you see < 0F.

Originally posted by vvk:
Try Castrol GTX 10W-30. I used to be an avid Mobil 1 user until I discovered oil analysis. Castrol GTX will make your car run smoother, quieter, rev faster. Your oil consumption is likely to decrease. Most significantly, your engine wear will go right down to almost zero

Castrol GTX is the one I would use too if I was using conventional oil, but I don't think many folks would agree it's just as good as Mobil 1.

The used oil analyses you see on forums like Bobistheoilguy.com only tell part of the story. They tell you about the wear metals and contaminants that come OUT of your engine when you change the oil. What they don't tell you is what got left INSIDE the engine when you drained the oil. Synthetics don't leave behind any waxy residue like dino oils and are also better at cleaning your engine. Plus they have greater resistance to thermal breakdown at the high operating temps that a turbo engine sees.

What you guys are talking about is an oils Volatility. Volatility is a measurement of the amount of oil which is lost during engine operation because of burn off. Some concerns about volatility are 1) engine oil is lost and must be replaced between oil changes 2) the viscosity of the remaining oil increases when the oil is burnt off 3) oil loss could change the effectiveness of the oil as a lubricant. The chemical properties and additive package ratio of the oil may also change as the volatile components are burnt off. There is evidence that volatized oil may damage the exhaust catalyst as it passes through them. I use Mobile 1 and my Subaru looses oil too. I have not used any other brand of oil so I can not compair the volativity. Like the TV commercial says, ‘Mobile 1 does not break down like regular mineral based oils….’ Is correct. It does not break down like regular mineral based oils…It breaks down synthetically!

:lol:

I'm not sure going to 10W30 in the summer in Edmonton is a good idea, even with synthetic. It's still pretty cool there in the summer (sister's family lives there)

I'm pretty happy with Castrol GTX, although since I got free case of Valvoline SynPower I am going to try it and see if I notice any difference.