BMK-13, is it that bad?

[chico80x]

If it's any comfort, I felt the same way you did right before I installed a BMK-13 on my 06 F-150 5.4L. I kept reading all of these stories about oil restrictions and the oil pump going into relief that I was also very concerned about installing it. Well it's now been on there a year and 18k miles and I haven't had a single problem with it.

I even went as far as installing a real oil pressure gauge that reads after the oil has gone through the filters and Ford spec for my truck is 75 psi at 2k rpm and that's exactly what I have so no oil restrictions are taking place at least in my application.

Just be sure to run a UOA at around 5k or so just to make sure everything is ok. I installed the by-pass when the truck had 2000 miles on it and ran the first OCI to almost 8k with the engine still breaking in and wear still read below average. If you care to see it here it is:

http://theoildrop.server101.com/forums/s...npe9iwo898je1f3

So if you take a few precautions, the BMK-13 will serve you well and one more thing, if you don't want to spend $15 a piece on Amsoil filters you can use the Pureone PL30001 and it works great. After this OCI I'm be running another UOA with a particle count and this is after I would've had the same by-pass filter on there for almost 25k.

 

[Tom_Jones]

i've been running mine for ~30K miles and no problems to report. i've done a few UAOs and it seems to be working...

 

[JBJ]

I gained 15psi by removing my Amsoil dual bypass. It depends on whether the engine oil relief is before or after the filter, or if your engine always dumps over a relief.

IMHO, Only use a dual bypass on an engine that does not relieve before the filter (or relieves at a very high emergency level only). It should be OK then.

If you don't know the oil circuit in the engine, you cannot make a good decision.

 

[Gremil]

I have a lot of vehicles and By Pass filters. On the Dual Remote BMK-13 there would be some pressure drop due to the restricter valve and I have acknowledged that in other posts. However, on my vehicles the drop isn't showing on the factory electrical gauges that came with the vehicle and on the air cooled VWs I can't tell much difference. I believe the sight pressure reduction is minor and within the design of the oil pumping system. It's possible on some vehicles the oil pressure variation could be more noticeable. I probably don't own one (yet).

I do prefer the stand alone By Pass for ease of installation. It works great and by using an orifice oil flow increases with high pressure and drops off at low pressure. But, even this system can have a slight effect on oil pressure at idle in engines suffering extremely low idle oil pressure. I find that increasing engine idle 100 RPM can rectify this problem. Granted, some engines cannot easily be idled up.

One quick detail: I've seen people accidentally hook up the hoses backward on the Dual Remote systems and this can cause oil pressure problems until the hoses are connected properly. "Out" on the filter adapter goes to the "In" on the filter mount. Some people can get confused here.