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I noticed that mountune recommends the FL400s and people on here are saying you can put in an entire 6quarts of oil when using that filter instead of the normal 5.7quarts. Is this safe? Should I just stick with the FL910s?
 

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Yup, you'll be just fine to throw in 6 quarts with the FL-400S. I run the Mobil1 equivalent and everything is fine. I even ran an experiment over the course of a couple days with the Mobil1 (which is a little bigger than the 400s) and 6.125 quarts brings me to the top of the hash marks perfectly. And how I'm not single, I will never know...
 

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Six quarts with the 400S is a hair too much in my experience.

I like with the engine cold to be at the top of the hash marks, not above that. Six quarts will get you past the top of the hash mark to the top hole, which is the max. Since there is no real windage tray on our cars (unless you do the counterbalance removal and put in a tray), no benefit to top filling. Indeed, foaming the oil with a higher level just makes more work for the oil separator and more gunk on the intake valves.

Also, the bypass valve on the 400S is a little higher pressure than the 910S, so in colder climates it may take a hair longer on cold startup to get oil up to the top of the engine.

Neither are big deals for almost all users I would expect, just something to think about!

All the best,
Mark
 

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Mark is definitely an expert and as he points out for exactly the reasons he listed, if 6 quarts puts you over the hash marks on a cold engine, take some out. You can do the 5.7 fill and add more the next day if you want.

As for the higher rated bypass valve, I always figured it was all sixes since the larger surface area of the filter would allow more oil to pass through it, making the difference between bypass valve ratings more a moot point?

I've always just ran the M1 equivalent. Since its larger and has a lower bypass rating than the 400S, it always fit the bill for me pretty well.
 

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I'm sure there can be some variation between engines also as 6 quarts with a 400 equivalent filter puts my cold oil level just a tiny tad below the top of the hashmarks. While I completely agree with Marks comments, the oil quantity between the top of the hashmarks and a tiny bit over is insignificant at best. The foaming mentioned is typically caused by the crank splashing around in the oil when the pan quantity is too high (not a good thing). 3/10's of a quart is NOT going to put this engine in that condition. And in reality, we're talking about less than 3/10's because the larger filter is holding some of that 3/10's inside the filter and not in the pan. All in all, 6 quarts even with the 400 filter is zero threat.
 

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I'm sure there can be some variation between engines also as 6 quarts with a 400 equivalent filter puts my cold oil level just a tiny tad below the top of the hashmarks. While I completely agree with Marks comments, the oil quantity between the top of the hashmarks and a tiny bit over is insignificant at best. The foaming mentioned is typically caused by the crank splashing around in the oil when the pan quantity is too high (not a good thing). 3/10's of a quart is NOT going to put this engine in that condition. And in reality, we're talking about less than 3/10's because the larger filter is holding some of that 3/10's inside the filter and not in the pan. All in all, 6 quarts even with the 400 filter is zero threat.
I agree; the added oil level height from an extra 3/10 qt is not a deal breaker.

The only thing I would say to clarify your comment for others is that oil foaming does not require the crank to actually contact the oil; the crank being close enough to the top of the oil for the wind generated by the crank to whip the oil up is enough - more so at higher rpms of course. Which is why they are called "windage trays" after all! :)

All the best,
Mark
 
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I've been running M1 0/40 Euro and the 400S for about 80k miles now. 6 qts in my car puts it right at the top hole. I've never witnessed any foaming at that level. I haven't done a teardown to inspect the internals but all in all the cars performance is very consistent, so I can assume it's happy.

Sent from my Pixel using Tapatalk
 

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good thread actually. I am running the 400 with 6 qt mobil 1 5-30 full synthetic, I was just at the top hole after the oil change and pressure test.
 

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Mark is definitely an expert and as he points out for exactly the reasons he listed, if 6 quarts puts you over the hash marks on a cold engine, take some out. You can do the 5.7 fill and add more the next day if you want.

As for the higher rated bypass valve, I always figured it was all sixes since the larger surface area of the filter would allow more oil to pass through it, making the difference between bypass valve ratings more a moot point?

I've always just ran the M1 equivalent. Since its larger and has a lower bypass rating than the 400S, it always fit the bill for me pretty well.
What is the mobile one equivalent???
 

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You can also use the Fram PH3600 or TG3600 or other 3600’s in their line. This is still longer than the Fl400s and thus holds more oil. I went this route only because Walmart didn’t have the Motorcrafts in stock once.
 

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Never use Fram. They have been know to come pre rusted.

Sent from another garage.
Lol, not this again.

Their base model filter is trash. ONLY THE BASE MODEL.

Their extra guard, or full syn filters are TOP TIER, like top 3 in their class.

Fram really ****ed up with their Orange cans of death, and can't shake that stigma from their excellent high end filters. Lol
 
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An interesting post from a Fram filter about why he’s no longer a skeptic....
 
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