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Discussion Starter · #1 ·
I've had my 2017 Q60 Premium for 3 years/36,000 miles. I've had Fast Intentions CBE and full catted Downpipes, HKS BOVs, AMS intakes and heat exchanger, and an ECUtek tune from Z1 Motorsports (19psi if I remember correctly). The tune has been on the car for just under a year (at approx 26k miles). I change the oil every 5k miles and don't beat the h3ll out of my car. It's my daily so I want to make it last. I've only REALLY pushed it maybe 4 or 5 times to race someone, but I never track it.

About 2 months ago, a couple days after I just changed the oil, I was leaving my neighborhood. As I was accelerating normally I felt something slip, almost like the transmission missed a beat. Then the car immediately went into limp mode. I pull over and do the normal Microsoft repair procedure; turn on and off. That's when the car started squealing. At first I thought it was a belt, since that's a known issue, but it kept getting worse.

https://drive.google.com/open?id=12WSuwR15PPdhL2ZJWNH8ITFVQBEEFKW3

I limped home, and every time I started the car after that it kept getting worse and worse; louder and louder. I made the mistake of asking the Facebook groups what they thought it was and then proceeded to have severe anxiety because everyone gave me the worst case scenario (for a change, they were right). I talked to some knowledgeable car friends and my shop and they all agreed that it was rod knock.

Second engine start: https://drive.google.com/open?id=11v6dGUku6ZnKtwUPFunnL8kn6mXAe8Rt

Fourth start: https://drive.google.com/open?id=125NvX1QfUB9k8x_KClENkaLGY1I4cvoB

So, off the modes went, and I flashed the ECM back to stock. I left the intakes, hx, air suspsension, brakes, and all of my aesthetic mods on when I brought it into Infiniti of Mobile. Side note: if you didn't know, if your car is still under warranty Infiniti will tow it to the dealer for free. My service advisor asked what the issue was and how it came about. I told her exactly what I said in the second paragraph. She really didn't deep dive into the problem at all. I warned her about the air suspension, so she saw the car was obviously modded, from the exterior at least, before I left with a QX80 loaner vehicle. I was living with total anxiety for next two weeks until I got a phone call from the SA. She said that they had sent pictures of the exhaust into Infiniti as well as ECM data, and Infiniti was asking for documentation of what work I had done to the exhaust. I was shocked at first because I had no clue how they possibly could've known. However, when I had a shop replace my OEM parts, I forgot that I did not bring them the OEM bolts so they had to use aftermarket ones. The rep at corporate saw that in the pictures and knew that something had been done. Naturally, I was freaked out, even though I knew there was no way that a CBE could cause rod knock. I wanted to get a read on the service advisor since I couldn't really pull one from her on our initial meeting, so I drove all the way to the dealer (it's 70mi) from my house. Of course, it was her day off, but the master tech who was working on my car was there. We spoke for about 45 minutes, and I only got a neutral vibe from him. He essentially said that he wasn't going to lie to Infiniti to help me out. I don't blame him since he didn't know me from Adam. He obviously knew that there was much more done to my car, especially since he looked where the exhaust met the cats (I trashed my heat shields doing installation of my DPs). I didn't think he told Infiniti anything more than what they asked for though. However, he said that this specific dealer had been highlighted for having a high number of warranty claims done, so they were trying to limit future claims. That didn't make sense to me, but also made me nervous because a fellow forum member also had his car in for service for a turbo warranty claim. He also brought his car in with all of the same mods I had, AND the tune still on. The tech said that they've never done an engine replacement before, and since Infiniti's motors are built so well, he would be surprised if they covered it especially since it's a $20k warranty ticket versus a $4k ticket for turbos, which are a known issue anyway. He still said it might be a 50/50 chance though. He said that the main bearings in cylinder 4 and 5 were completely destroyed.

Went home, sent in the invoice from Fast Intentions, and waited in turmoil. Three days later, the SA called the tell me that Infiniti had agreed to cover the replacement under warranty! Holy Sh1t, right? I'm one lucky S.O.B. In around two more weeks, they should have it finished.

Just wanted to share to keep everyone updated with how these cars are holding up. I'm still trying to determine what exactly caused this. I'm leaning heavily towards the tune, and how it was tuned. That's a whole other story in itself. I think my lesson "learned" from this is you get what you pay for, so I'll be using AMS next time. I say "learned" because going the cheaper route has burned me before and for some reason I continue to do it lol.
 

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Sometimes the cheap comes out expensive
 

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Discussion Starter · #5 ·
So now after speaking with a pretty knowledgable individual, I've started to consider another possible cause of the knock.

I live in Florida, change my oil every 4-5k miles, and use Mobil 1 synthetic 0W-20. I was told that when modifying these cars, especially since they have turbos, the viscosity of the oil we're using will decrease a significant amount because of the added heat, thus making the life of the oil drop faster. Therefore, it's much wiser to use a heavier weight oil like 5W-30 to prevent the issues I had, especially since I live in a much hotter climate.

That's probably not rocket science to our local experts, but I don't pretend to know dick about cars and engines so this is all new to me.

What do you guys think? Is that more probable than the tune causing the problem?
 

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Discussion Starter · #6 ·
That being said, here's the most recent analysis of my oil by Blackstone. They say different.
 

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That being said, here's the most recent analysis of my oil by Blackstone. They say different.
Wow - 126 ppm of Iron in the oil @ 6800 miles? And then 26 ppm at 35k miles?

For reference, I changed my oil & filter @ 1k miles, and then 4-5k miles from then on. I followed the Infiniti break-in procedure until 1200 miles.

The highest iron was 34 ppm @ 5k miles, and now its been reduced to 16 ppm & 15 ppm for the last two OCIs since a change @ 9.5k. My engine now has 22k miles.

I have been using Valvoline Modern Engine 5W30 & the oversized Nissan oil filter for the last two OCIs.

Direct injection (DI) will typically shear down the oil one viscosity grade in 5k miles, which is why I limit the OCIs to 5k miles and use 5W30 oil exclusively.
 
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Discussion Starter · #8 ·
Wow - 126 ppm of Iron in the oil @ 6800 miles? And then 26 ppm at 35k miles?

For reference, I changed my oil & filter @ 1k miles, and then 4-5k miles from then on. I followed the Infiniti break-in procedure until 1200 miles.

The highest iron was 34 ppm @ 5k miles, and now its been reduced to 16 ppm & 15 ppm for the last two OCIs since a change @ 9.5k. My engine now has 22k miles.

I have been using Valvoline Modern Engine 5W30 & the oversized Nissan oil filter for the last two OCIs.

Direct injection (DI) will typically shear down the oil one viscosity grade in 5k miles, which is why I limit the OCIs to 5k miles and use 5W30 oil exclusively.
It'll be interesting to compare my old engine and my new engine. I didn't follow the break-in procedure for my first, but I'm going to gnat's ass it on this new one. Definitely switching to 5W-30 and will be doing the changes at a max of 4k miles.
 

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So now after speaking with a pretty knowledgable individual, I've started to consider another possible cause of the knock.

I live in Florida, change my oil every 4-5k miles, and use Mobil 1 synthetic 0W-20. I was told that when modifying these cars, especially since they have turbos, the viscosity of the oil we're using will decrease a significant amount because of the added heat, thus making the life of the oil drop faster. Therefore, it's much wiser to use a heavier weight oil like 5W-30 to prevent the issues I had, especially since I live in a much hotter climate.

That's probably not rocket science to our local experts, but I don't pretend to know dick about cars and engines so this is all new to me.

What do you guys think? Is that more probable than the tune causing the problem?
As a California guy myself who lives in similar hot weather like you, 5W-30 on these cars is without a doubt the wiser choice. Glad they honored your warranty btw.
 

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more then likely it was probably a over aggressive tune...but its hard to blame the tuner unless you have logs. It also couldn't been just a mechanical defect...nothing is 100% even japanese engines. You should always data log once you start modding your car.



if you dont want to datalog and monitor your engines health...i would just keep it stock.
 
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Discussion Starter · #12 ·
more then likely it was probably a over aggressive tune...but its hard to blame the tuner unless you have logs. It also couldn't been just a mechanical defect...nothing is 100% even japanese engines. You should always data log once you start modding your car.



if you dont want to datalog and monitor your engines health...i would just keep it stock.
I did a few logs in the beginning for myself, mainly because I didn't know anything about the program. I thought maybe my tuner would ask for them at some point, but he never did. I have zero issue running the logs, but my tuner never explained to me anything about this process. Like I said above, my experience with him left a lot to be desired. I called AMS today to discuss my options with them and I'll more than likely be going with them for my next attempt.
 

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FYI at least one month or more every Infiniti dealer goes under probationary period in warranty claims... even ours with our top reputation. Infiniti sends in corporate guys that review all our records processes etc and tries to crack down if they can.

Just letting you know they weren’t lying to you it’s a pain in the ass but at the same time I get it Infiniti try’s to run a tight ship.
 

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I did a few logs in the beginning for myself, mainly because I didn't know anything about the program. I thought maybe my tuner would ask for them at some point, but he never did. I have zero issue running the logs, but my tuner never explained to me anything about this process. Like I said above, my experience with him left a lot to be desired. I called AMS today to discuss my options with them and I'll more than likely be going with them for my next attempt.
yeah the logs can show you problems before you actually feel it in the engine. when you feel it in the engine, its usually too late, especially on FI cars.



when i was tuned on my n54..i would log every so often...always use the same gas stations and preferably the same pump, avoid chances of getting bad gas or gas thats under oct.
 
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Discussion Starter · #18 ·
Wow I didn't realize Z1 was so aggressive on their tunes.
I didn't even think it was that aggressive. I told him it was my daily, so nothing too crazy. 19psi isn't even that bad. When I called AMS, they told me they tune Q60s anywhere from 20-24psi. That's crazy to me!
 

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