High-Mileage Q45's -- Check In Here If You're Over 200,000 Miles...

[azskygod]

Do these engines ever quit? I drive a LOT of highway miles and this is the only vehicle I've ever owned to go over 120k on the original engine without a rebuild. I'm looking at 245k right now and the only complaint I have is some light exhaust smoke right before an oil change is required.

(BTW: Any suggestions on how to eliminate/minimize this?)

Sound off with your current mileage if you're over 200k. I'm curious to see if 300k or even 400k is possible on the original engine...

AZSKYGOD(Burgundy 1991 Q45a with 245,000 miles)

[DrewQ45]

I'm close, 190K! Do I still get a prize?

[elwesso]

What weight of oil are you running?

[PalmerWMD]

T3's house--Q was in the hi 400's last time I checked but that was with new heads.

[redmanfx]

262k and still going strong. I stopped racing other vehicles at 259K. There are at least two other Q's that have more mileage than mine here at NICO that I'm aware of and I'm sure many, many more. The transmission and other things usually go before the Vh45 does. If you take care of it, it will take care of you.

red

[90Q45blue]

Hopefully Dennis will chime in here. I think he has us all beat.

Nick

[nchopp]

193,000 - gettin' there. :-)

[Jesda]

203k.transmission has 150k, replaced by dealer under warranty in 1995.Just picked up an AC compressor this morning.

Mobil 1 ATF every 15-30k.Mobil 1 or Supertech synthetic motor oil and Mobil 1 or Supertech filter every 3k.

[DrewQ45]

Mobil 1 10W-30 for as long as I can remember. Oil filter = K&N HP-2008 (has a 1" nut on the end for easy pulling)

[greg_atlanta]

About 214K for my '92 (new valves on one side from fixing chain guides at 130K).

[Jeff Williams]

Layla has about 228K, and I will race just about anything, if it is safe (and I know I can beat it ).

I have been using Castrol 10W-30. She burns no oil, but I change it at 2,500 mile intervals. I may go to Amsoil, because that is what I run in Lola, and I have a couple cases of it.

I have no doubts 300K is easily attained.

Last I checked, Dennis was at 280K, and his Q is a monster!

[azskygod]

Wow, those are some impressive numbers... My brother and I have speculated that the highway-driven Q's experience fewer mechanical problems, even though they log much higher miles. Seems like I have had fewer problems with clogged injectors, worn brakes or mechanical issues with bolt-on accessories than his Q -- which has fewer miles but frequently makes short trips around town.

The Q feels like it was built for cruising the highway. I love the fact that I can do 80 mph at 2500 rpm. A tip of the throttle, and I'm back in the power band for a quick run to well over 100 mph. Nice!

I've also noticed the light smoke problem when the temperature gets really hot outside. I'm in Arizona where it approaches 115-degrees regularly during the summer. It was 122 in Bullhead City yesterday!

10W30 all year 'round. Should I try a thicker oil?

AZSKYGOD

[AZhitman]

About 214K for my '92 (new valves on one side from fixing chain guides at 130K).

Where the HELL have you been?

Good to see you man!

[Jesda]

I'll second that.

LTNG! (Long time, no Greg_Atlanta)

[Q45tech]

290,655 miles even though odometer reads 190,655...........orginal injectors and harness.........only KS and harness and chain guides replaced. Third set of plenum hoses recently..........CAS and MAF replaced year agoHowever a few cylinders are marginal at cold and hot idle compression..[that durn K&N cone I used from [50-150k]....but things get ok by 2,000 rpm.......shakey idle from chain stretch........however it still performs better [or equal] than a stock new engine [JWT ecu]. Power balance test is still within +-12 rpms.

transmission number 3 has 75k now, 2nd drive shaft 170k, 2nd diff 130k, Motor mounts 170k.

Time to buy a few $500 parts cars to get ready for the next rebuild.

At this rate the 300k goal should by there before Thanksgiving.

[elwesso]

290,655 miles even though odometer reads 190,655...........

And how many of those miles would you speculate were above 5000 RPM

Have you taken it up to the redline recently?

[Jeff Williams]

And how many of those miles would you speculate were above 5000 RPM

Have you taken it up to the redline recently?

I took his Q to the redline, in April .

[EQwhipD]

Just chiming in with mileage- 232,----EQwhipD

P.S.- Is Saturday still happening at Fil's house in Durham, NC?

[deltamoon]

I'm at about 231,000...

[greg_atlanta]

Where the HELL have you been?

Good to see you man!

Very busy at work, so not as much time to fart around on the internet. Car is doing well, but time for rotors/pads all around, new front shocks, and maybe check out odd fuel pressure problem.... so my Q is still a Q.

I got a bunch of parts from Joe and will drop it off at T-3 next week, I think.

I get a slight dead spot during initial acceleration and sometimes get a surge in 2nd gear between 3-4K RPM (like climbing a hill). Also get a fuel smell when engine is cold, so I think an injector might be leaking? I can't see it leaking, but worth checking out. Fuel hoses and fuel pump were replaced in the last 18 months.

Did ethanol get added to Atlanta gas? I haven't seen anything different at the pumps.

[Q45tech]

Still in litigation-Ethanol..........did you notice the funky [low octane fuel we got in middle May - June.......what junk - octanewise. Took a can of 44k every tankful to function.....problem went away around July 1st.

They were giving us the bottom of the barrels so to speak.......every non OBD2 Q rattled when hot.

[greg_atlanta]

I'm dropping off my car at T-3 on Monday afternoon. Is Doug still there? Didn't recognize the guy answering the phone today.

My fuel problem isn't bad but I doubt it's just crappy fuel. I have done about 4 bottles of isoheet and 1 big bottle of techron, still getting flat spots accelerating.

[Q45tech]

No, Doug is on extended medical leave and may never return.

Don is the new service writer and he has some previous experiences with old Infiniti....[he also was/is a technican with a big tool box]..........but as always rely on what Byron reports back to him. As his last few years were dealing with domestics.

[greg_atlanta]

My car's at T-3 with a trunkful of parts. Sluggishness may be bad gas, or heat, or both... but with fuel leaking there's something going on. MAF may be dirty (dealer did quick fix on MAF about 4 years ago).

Driving a Mitsubishi Lancer from Enterprise, pretty perky for an econobox. Not a bad car with some better tires.

[greg_atlanta]

Well, it's fuel pump and fuel hoses again per Byron at T-3, not MAF or FPCU. Fuel pump was replaced 11 1/2 months ago and hoses replaced 18 months ago.

At least the car is predictable!

[hondasmasher123]

I am new here, so i am learing the ropes of sorts and hoping to learn as much as i can about the q45..

I have a 91 Q45, with out the fancy suspension or anything else. My dad bought him in 94 with 55K miles and blew the engine the next day..The engine was replaced with a 93 model engine (have recipt w/vin from prior car) with 5K miles..Dad had a trans cooler put on, as he planned on a **** load of high way miles.. The car was passed on to me 6 years ago (99') needing a new trannie @ 175K.. I have driven him another 175K miles and so far everything is still going strong. I have put 2 sets of struts, 3 sets of brakes and tires, changed the oil every 2500 miles with mobil one synthetic, he gets a full tune up every 30K and is babied. I think this thing will keep going for another 100K miles... It blows no smoke, hasn't leaked oil scine i replaced the valve gaskets and has needed very few repairs.. I do keep my car maintained by nissan (not infiniti, but nissan)..This is now my weekend cruiser and not my daily driver (i have a 01 Altima with 76K and a 98 Exploder with 100K, both of which run like champs as well).. The check engine light came on for the first time in 9 years...It seems to also need a fuel pump. Wonder if i should replace the alternator or water pump next time i change the belts??? Cm

[Q451990]

My dad bought him in 94 with 55K miles and blew the engine the next day..The engine was replaced with a 93 model engine (have recipt w/vin from prior car) with 5K miles..

Interesting... do you know what happened to the engine? Chain guides? That would be one of the earliest documented failures. Also, why was a used engine installed? The car should have been well within factory warranty at that point.

Sounds like you take good care of your Q... M1 every 2500 miles is amazing...

Welcome to NICO!

Heath

[Romeo5k]

Just made 205k Yesterday.. Mostly highway miles.. not too much street miles.. driving 300 miles one way.. But here i was getting scared.. maybe a new engine or transmission.. But this thing can go.. I see higher numbers at 295k or so.. i guess ill be iight then..

[maxnix]

Fresh fluids and filters and preventative maintenance can lead to a long and satisfying life for your G50.

[qship96]

Fresh fluids and filters and preventative maintenance can lead to a long and satisfying life for your G50.

Especially for those who bought brand new or low mile cars- kind of tough to purchase a 8-9-15 year old Q that has been thru 3-4-5-7 owners with high miles and expect sudden use of premium fluids and agressive maintenance to undo years of wear from less than stellar previous owners.Why so many new owners of old Q become frustrated and throw in the towel as all systems begin to fail before their time.