4.0V-6 longevity issues?

There has been comment that the 4.0 V6 is not as durable as the 3rd gen motor? That it is iffy after 300K...Also mention that it can not be re-built because of having such thin cylender walls..Can anyone here please verify or deny?...THANKS

 

Lol

 

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If there ever was a thread for the sake of having a thread.

 

Per the expert both 5th gen 4R 4L V6 and 3rd gen 3.4 V6 are in best engines list. In fact they were rated above Land Cruiser 200/ Tundra 5.7 V8 / Lexus GX460 4.6 V8 engine.
But he did say about age of 3rd gen 3.4 V6 when its 20 years old and 300K miles could give you issues but you fix it and miles keep rolling. Since 5th gen 4L is new I bet it would be better since you will have more time until it needs some extra love.

 

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We have BIG (really big!!!) striped bass here in Lake Texoma.

OP, if you wanna fish - you'll catch bigger ones right here.

Also, just curious - what is a "cylender" wall?

 

The 4.0 has been running a lot longer than the turd gen V6.

For some reason I was thinking 3.5 out of the Tacoma. The 3.4 V6 is a great engine. Both the 3.4 and 4.0 are great engines.

 

Hmm, let's compare scientifically: how old is the longest running 3.4 vs. the longest running 4.0? I'm betting the 3.4 beats it by around 9 years.

Checkmate, 4th and 5th gen owners.

OP, totally agree, that's why I plan to sell mine to a sucker around 295k miles so I don't have to deal with the cylender issues.

 

It's Friday for sure.

 

I haven't seen a good Friday post in a while.

 

I think what folks should ask is “Where is this comment? Can you share?”, and then ask, “what is the statistically reference they have for this comment?” and share that as well so we can review it for ourselves.

A lot of today’s turmoil is based on “someone’s comment”, with no references and no data / evidence provided to review. And people don’t understand importance of statistical correlation / causation implication, as it relates to sample size (usually too small to be meaningful or to narrow variables). This is line Pfizer saying the jab is safe for pregnant women, as we tested it on 6 mice.

 

I'd bet the comment was made by someone who believes oil changes were a scam invented by Hallmark.

 

Maybe this would go over in the 4th Gen section. They would have the oldest 4.0L used in a 4R.

 

I'm not sure there is a more durable engine than the 4.0 V6. I drove a 4WD Tacoma double cab with the single VVT version of the 4.0 V6 for ~13 years before I bought my 4Runner. I'm, by no means, hard on vehicles - but I couldn't break it. In 13 years there was never any repair/service on the engine/transmission - other than the normal maintenance schedule stuff - which I followed religiously. It never failed to start, never broke down, never stopped running - heck it never even idled funny. The 4.0 V6 ran as good the day I gave the truck to my son as it did the day I drove it off the dealer's lot. My personal experience with the 4.0 V6 is why I bought a 2023 4Runner - I wanted one before they went away from the 4.0 V6/A750 combo - and I like the dual VVT version in the 4Runner even better. I've told this story in another thread before - about 5 months after I gave the truck to my son he, and his wife, were in the truck and hit a large deer. He immediately called me and said the truck was still running but he could tell there was a lot of damage to the front end. I asked if he was off to the side of the road - he said as far as possible, there was no shoulder but there was a gravel road to the right about 50 ft ahead. I told him to drive it far enough to turn off on the gravel road and shut it down because the radiator was likely destroyed. The 4.0 V6 never stopped running until he shut it down. The truck was totaled - and the insurance company gave him $19,000 for a 13 year old truck that I paid less than $26K for. Unknown to us at the time, my daughter-in-law was less than 1 month pregnant with our first grandchild at the time of the accident - its a boy and due to be born in about 5 weeks. No injuries at all to either of them - the air bags didn't even deploy. Yeah, that 4.0 V6 is some piece of shit.

 

Do you have a link to the comment you are referring to in your post for peer review?

 

Imagine the thought process of starting this thread after 20 years of this engine being in production, lol.

Let's debate the merit of LS series V8's. I think those are a passing fad, and just can't keep up with the stresses of truck use as well as a big block.

 

They work just fine when they don't have fuel saving BS on them. Also they are vortec in the pickups, not LS.

 

I’ve said that in the past, but the circumstances are very narrow.

A taken care of 1GR will last as long as a 5VZ, all things equal. But if I had to pick between an abused 1GR and an abused 5vz I’d take the 5VZ in a heartbeat.

The 1GR uses thin cast iron sleeves for the cylinders which can’t be rebored or resleeved (though some people say you can). The 5VZ uses an iron block, it doesn’t have that limitation. So if the cylinders get scored it’s a new block.

Further more, most 1GR have vvt or vvti, which means any resurfacing of the head is tricky because the small change in height can throw the angles off. You can use a thicker head gasket, but thats not a thing with the 5vz.

Granted these characteristics only come into play when the engine is very worn or very abused. The 1GR engine can take a lot of abuse. In normal life the 1GR is less of a pain in the ass thanks to the use of timing chain.

I’m not a huge fan of drive by wire used on the 1GR, but I’ve never seen anyone have it malfunction. And that is less of a gripe with the engine itself. I think DBW is unnecessary on a truck which isn’t intended to have sports car throttle response.

 

Thanks for the clarification.

You must know I'm being sarcastic, and I'm including the old 350 as well in the "fad" claim.

 

Fine by me. Even if true 300k is pretty damn good. Based on how many miles per year I drive the 4Runner, I'll hit 300k in about 35 years. I'll be long gone before then.

 

Uhhh…the 3.4 WAS in production for 9 yrs.
The 4.0 GR-FE family has been in production since 2005 to present = 20 model yrs.
The 3.4 is +80 HP down to the 4.0 which will aid in longevity just like my 22RE does.

 

Use good quality oil and filter every 3k-5k miles and forget about motor issues. Also change the oil and filer after a dusty adventure, and the air filter.

 

Lol

 

I'll concede that you state the circumstances are very narrow - but who is going to bore out the engine block and replace the pistons, etc... on either a 15-20 year old 1GR or 5VZ with 300K miles on it? No one in their right mind would even consider doing this. It would be damn near the same type of lunacy to consider replacing the engine with a decent one from a salvage yard in this same situation. 15-20 years, 300K miles, scored cylinders? You got your money's worth - time to move on - no?