Hey just wanted to see if anyone else is having this problem. I have been running around with a Bassani catback and MREV + for quite a while with zero issues. Just recently I have installed the Strup test pipes and now the car is burning oil.

My question is does the 05 6MT engine require a certain amount of backpressure to avoid having oil blown into the engine? This is the only thing I can think of as to why now I am all of the sudden burning oil. It must be due to lack of back pressure or something.

I have removed the MREV + and the test pipes and the car doesn't blow blue smoke out anymore when I rev it or flat foot it. I am going to be monitoring the oil level and see if it is still going through it. I was going through nearly a full quart in 250kms. Car is going into the dealership next week to see what they find wrong with it.

If the test pipes are the problem I am going to be really pissed as nothing was ever mentioned when I bought them. Strup will be hearing from me and they can have the fuggers back. Total bull**** if they are causing the motor to burn oil, they should have tested them better before I wasted $160 on them.

Also, does ayone know if high flow cats will keep enough backpressure to avoid having this motor burn oil. I really want to scrap the stock cats for flow and sound, but will only go to high flow cats if there is zero chance of this **** happening again. What brand do you recommend?

Hope you guys can give some input and help me figure out what is the problem.

TIA.

 

I suggest putting the stock cats back on and taking it
to your dealership. Your car requires backpressure,
by removing it you'll find all kinds of strange things
happening. After your trip to the dealership put the
MREV back on and find a good set of high-flow cats
like Crawfords. With this setup you'll have all the
backpressure you need to keep your G running good
without burning oil. This is kinda like a balancing
act, sometimes you go to far.....LOL

 

Exhaust velocity, not back pressure is what makes an engine run at peak performance. Back pressure is neither a good thing nor something that reduces oil consumption. I doubt the test pipes are causing a consumption problem. Honestly, I don't see how they could cause oil consumption. My guess is there is something significantly wrong with the engine that just popped up recently. I'd take the test pipes off and see if there's any change plus a dealership won't be happy to see them.

 

I highly doubt it's the test pipes. I think it's coincedental. However, even if it were the test pipes, why would you be pissed at Strup?

Do you expect a manufacturer to test every conceivable combination of modifications for a car? Is it the manufacturer's responsibility to obtain your specific exhaust, plus the mrev, plus your model year vehicle, and conduct x number of thousands and miles of testing to check for abnormal oil consumption?

Get real. That takes capital and resources. It doesn't make business sense. Measured against the volume of sales for something like test pipes, it makes even less sense.

 

Well we will see by the end of the week. I will post up what the oil consumption is. The cats went back on yesterday before I made this post as well as the stock intake manifold. I can tell you this much, when standing still and reving the motor to 5K not a friggin puff of blue smoke. Also went for a drive last night and not any oil smell or any blue puff and my dad followed behind me. Before it would blow blue smoke out the exhaust like a mother and stink of oil.

In all honesty why should I not be pissed? If I hadn't of checked my oil when I seen the blue puff it would have been ****ed, I was losing over a quart in 250kms. If it turns out to be the test pipes that are at fault, then I guess this is your test data.

 

Alright so it quit burning oil with the stock cats back in place. Now for the guys that are running test pipes and no issues, what engine oil are you running? I am running a 5W-30 full synthetic engine oil. I just got off the phone with crawford and I was asking about their cats. Anyways, he mentioned people were having bad luck with synthetic oil and this engine, plus he said to run a 10W-30 as the 5W-30 was to thin. To me if the thicker oil gets rid of oil consumption it is a band-aid to a bigger problem, but maybe it is the synthetic that is the problem. however, I have ran synthetic for over 20,000kms and not one issue. Maybe this info will spark some new debate.

 

On second thought the synthetic oil idea I am tossing out the window. I was burning oil on acceleration, therefore the problem was an oil control ring. If it was burning oil when letting off or all the time it would be a valve seal. So does anyone know if this motor requires backpressure to prevent oil control rings from collapsing? Maybe my motor was setup too lose from Infiniti and the test pipes decreased the backpressure enough to illustrate the flaw? Just really funny how with the cats back in nothing is happening.

Also, does anyone know a good technical advisor at infiniti or even an engineer? I want to call someone and ask about this, but don't want to talk to the people at my dealership, all they should be able to void is my exhaust warranty, but I am not risking it for now.

 

Just got back from the dealership. Car was checked through and the PCV system is fine, EGR is fine, compression test for compression rings was 100-104%, and spark plugs were good.

So that leaves one thing, oil compression ring in my mind. After 800kms of driving car was down 0.5L. So it is burning less oil now with the cats back in, but still consuming oil. Guess I need to just do the oil consumption test and find out what the infiniti engineers are going to say. I am very fuggin curious because if this motor needs backpressure that is weird.

 

I was down 2 Qts after ~2800 miles, I'm doing the oil consumption test Thursday. I probably could switch to 10w30 and solve the problem. I want to get to the bottom of this before the warranty goes.

 

That is bad, but I have been doing the consumption test for about 3-4 weeks and my car went through 2 litres in 1200 km. If 10W30 slows it you are just band-aiding the problem and Nissan/Infiniti should fix it.

 

I am getting a new motor. Not sure if it is a long block or complete engine with intake and exhaust manifolds, but it is on back order. Told me it might take from 3 weeks to 3 months. Anyways, just letting you guys know.

 

Wow infiniti is giving u a new motor... I was burning about a quart every 1,000 mile... I had kinetix cats and plenum, and injen intake... Never found out wat the problem was though...

 

I got all bolt-ons modification (including crawford hi-flow minus TS reflash/Eu) and synthetic oil... haven't experienced any problem...yet (for almost 12k miles)

 

Well I was dropping 2 quarts in 1200kms. This was with stock cats put back on, no MREV, and just my bassani catback. I never had the headers until three weeks ago. So they checked the PCV system like 4 times, oil consumption like 6 times and finally said it must be the motor. I am thinking bad oil control ring. Either infiniti has a bad honing job, bad rings, bad block, or something. I don't car what they say going over 4K isn't going to make a motor use oil. If it does you have a crappy built motor in my mind.