Xoutpost.com - View Single Post - DIY Solution to M54-M52TU CCV problems

axgordon · #7 06-10-2015, 10:48 AM

Quote:

Originally Posted by trader4

Trader4 – All good points. I am myself firm believer in the effectiveness of stock components and always try to use genuine parts for critical systems. This situation is little different. Let me try to answer some of your questions:

If you think having to add oil between oil changes is unusual with high mileage, 10+ year old cars, then you must have some exceptional
vehicles.
Ricky’s car is not high mileage car - less than 80k miles if I remember correctly. My 528i with m52tu engine did not consume a drop of oil at 180k miles

Of course BMW put the CCV system on for emissions. My point was
that if it results in a decrease in MPG compared to the simple PCV
type design, then they would have to be pretty dumb to use the oil
separator design when they are desperate to increase MPG.
All the other manufacturers of all kinds of vehicles are meeting EPA with PCV type designs.

Yes. Original BMW CCV system works perfectly fine on m52tu motors. I did not found any reference that m52tu ever hydro locked in cold climate. The only known mode of failure – slugged CCV causing oil leaks and drivability / idling issues. The only substantial difference in design between m52tu and m54tu is low-tension rings on the latter. I spoke with the reputable performance shop owner and he confirmed that he successfully fixed high oil consumption on two m54tu by replacing piston rings. My theory here that extra blow by gases reach in H2O on m54tu causing simply overload capacity of stock CCV system. Apparently, these low-tension rings starting to fail at 60k+ miles causing excessive blow by. This is why we do not see mayo on low mileage m54tu. It is frozen mayo causing catastrophic failure of CCV and hydro lock as of result.

Perception of peppiness is almost meaningless, given the high potential
for the placebo effect.

Cannot argue here. Nevertheless, I noticed better performance myself.

BTW, you didn't answer the question as to what the reference point
for these claimed benefits is? A new, stock CCV system? Or an old 100K,
stock one that is possibly failed, known failed, etc.

I was trying to provide this information in my original post. I used my car stats with old, new and aged CCV system. I thing that 5+ years routine of adding oil every 2k miles is reasonable reference point.

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