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#4757664 - 05/15/18 08:47 AM High RPMs on freeway. Toyota 4 cylinder longevity
Kurtatron Offline


Registered: 04/06/10
Posts: 174
Loc: Detroit
More and more I find myself having to speed up to keep up with modern cars. My 1991 Toyota Previa is geared way too low for my comfort. 5th gear is around 3700rpms at 70mph. Iím nearing 4000rpms at 75mph. Do you guys think my concern about this vehicleís longevity is unfounded? I just have this paranoia that the engine is going to blow up or become a big oil burner running those rpms for so long on the freeway. I put red line oil in it to appease my paranoia. Do you guys think this engine can last for a long time? The engine is a jdm engine with unknown miles, but was in spotless condition when installed. Been running it for a year now with no problems. Itís a 2.4 liter 4 cylinder. I know modern cars like the Honda Fit spin fast also, but those are smaller 1.6 and 1.8 engines. I think smaller engines would work better for those rpms


Edited by Kurtatron (05/15/18 08:52 AM)

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#4757671 - 05/15/18 08:54 AM Re: High RPMs on freeway. Toyota 4 cylinder longevity [Re: Kurtatron]
IndyIan Offline


Registered: 09/23/08
Posts: 9112
Loc: Ontario, Canada
Originally Posted By: Kurtatron
More and more I find myself having to speed up to keep up with modern cars. My 1991 Toyota Previa is geared way too low for my comfort. 5th gear is around 3700rpms at 70mph. Iím nearing 4000rpms at 75mph. Do you guys think my concern about this vehicleís longevity is unfounded? I just have this paranoia that the engine is going to blow up or become a big oil burner running those rpms for so long on the freeway. I put red line oil in it to appease my paranoia. Do you guys think this engine can last for a long time? Itís only got about 100k miles on it now. I am hoping it can last another 100k.

It would be interesting to see what the oil temperature is after running near 4k rpm for a while, but I suspect it will highish but still in the range of good, especially with redline in it.
I don't think that 4k rpm will make an engine an oil burner, but an oil burner will burn more at those rpms. What's your mileage at 75? You will get far better mileage at 65 so maybe that's incentive to slow down a bit.
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#4757677 - 05/15/18 08:57 AM Re: High RPMs on freeway. Toyota 4 cylinder longevity [Re: IndyIan]
Kurtatron Offline


Registered: 04/06/10
Posts: 174
Loc: Detroit
I canít slow down without feeling like a menace in these parts. I am already on the slow lane, getting passed by big trucks running 70.

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#4757679 - 05/15/18 08:58 AM Re: High RPMs on freeway. Toyota 4 cylinder longevity [Re: Kurtatron]
jeepman3071 Offline


Registered: 04/15/10
Posts: 4314
Loc: Storrs, Connecticut
It's a Japanese 4 cylinder engine, they are made to rev. It will be just fine at those RPMs. In fact, every Honda 4 cylinder engine I've driven ran more efficiently in the top end, they have almost no low-end torque and need to be revved.

Keep the oil full and changed regularly and you won't have any issues.
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#4757682 - 05/15/18 08:58 AM Re: High RPMs on freeway. Toyota 4 cylinder longevity [Re: Kurtatron]
Trav Offline


Registered: 11/20/06
Posts: 19304
Loc: MA, Mittelfranken.de
I don't think so I know it can with no problem whatsoever.
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#4757688 - 05/15/18 09:03 AM Re: High RPMs on freeway. Toyota 4 cylinder longevity [Re: jeepman3071]
JLTD Offline


Registered: 12/15/17
Posts: 835
Loc: US
Originally Posted By: jeepman3071
It's a Japanese 4 cylinder engine, they are made to rev. It will be just fine at those RPMs. In fact, every Honda 4 cylinder engine I've driven ran more efficiently in the top end, they have almost no low-end torque and need to be revved.

Keep the oil full and changed regularly and you won't have any issues.


+1
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#4757689 - 05/15/18 09:04 AM Re: High RPMs on freeway. Toyota 4 cylinder longevity [Re: Kurtatron]
Kurtatron Offline


Registered: 04/06/10
Posts: 174
Loc: Detroit
Do you guys think an oil analysis would be worth looking into? Would low wear numbers indicate anything? Or is it just a shot in the dark as far as determining high rpm effects.

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#4757694 - 05/15/18 09:07 AM Re: High RPMs on freeway. Toyota 4 cylinder longevity [Re: Trav]
Ducked Offline


Registered: 10/25/12
Posts: 4432
Loc: Taiwan
Originally Posted By: Trav
I don't think so I know it can with no problem whatsoever.


Don't run yourself down.

Perhaps you mean "I don't think;I KNOW it can, with no problem whatsoever."

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#4757698 - 05/15/18 09:08 AM Re: High RPMs on freeway. Toyota 4 cylinder longevity [Re: Kurtatron]
FermeLaPorte Offline


Registered: 07/25/17
Posts: 503
Loc: Texas (south)
My Nissan's engine is named HR16DE, HR means High Revolution. I think Japanese inline-4 design is for them to be high rev because they tend to be underpowered.
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#4757699 - 05/15/18 09:09 AM Re: High RPMs on freeway. Toyota 4 cylinder longevity [Re: Kurtatron]
khittner Offline


Registered: 07/13/12
Posts: 327
Loc: Michigan
It's a 26yr-old vehicle, and you're wondering whether it'll last for long around Detroit? Keep oil in it, and worry about your ball joints, bushings, and rust.

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#4757702 - 05/15/18 09:11 AM Re: High RPMs on freeway. Toyota 4 cylinder longevity [Re: Kurtatron]
Number_35 Offline


Registered: 07/07/14
Posts: 841
Loc: Winnipeg MB CA
First of all, I covet your vehicle - I always loved those Previas, especially the early ones ('91?) with the 5-speed manual. They have the reputation here as being one of the most durable minivans of all time. (The other longevity champs are mostly RWD as well.)

I didn't know the Previa was geared that low - those revs sound really high. The engine is the 2.4 l, correct? Is it automatic? If so, are you sure it's shifting into 4th (O.D.)? (I just reread your post - you mentioned 5th gear, so your van must have coveted manual, and obviously you're in high gear.)

By comparison, our '90 MPV (2.6 l w/ 5-speed manual) ran at 2500 RPM @ 100 kph (62 MPH), which extrapolates to about 2800 @ 70 MPH, and 3000 RPM @ 75 MPH.

Our '97 MPV (3.0 l w/ 4-speed auto.) runs at about 2250 RPM @ 100 kph.

Our '09 Mazda 5 (2.3 l w/ 5-speed manual) runs at about 2700 RPM @ 100 kph.

I had read somewhere that Toyota reckoned that their engines ran at maximum efficiency at about half of redline, and at one time geared their cars accordingly, such that the engine would spin at half redline @ 55 MPH.

Be aware also that analogue tachs tend to read high - the actual RPMs may be 10% or more lower than indicated. Do you have a ScanGauge you could compare to?

What oil grade does Toyota spec for the Previa? It's too old for xW-20, so I would guess they spec'd 10W-30 down to 0 F, and 5W-30 below that, correct? I think you'd be fine with a stout 10W-30. Others here, far more informed than I am, can recommend a thick 10W-30.

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#4757707 - 05/15/18 09:16 AM Re: High RPMs on freeway. Toyota 4 cylinder longevity [Re: khittner]
Bottom_Feeder Offline


Registered: 12/07/08
Posts: 3035
Loc: Occupied Virginia
Originally Posted By: khittner
It's a 26yr-old vehicle, and you're wondering whether it'll last for long around Detroit? Keep oil in it, and worry about your ball joints, bushings, and rust.

What he said.

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#4757708 - 05/15/18 09:16 AM Re: High RPMs on freeway. Toyota 4 cylinder longevity [Re: khittner]
Kurtatron Offline


Registered: 04/06/10
Posts: 174
Loc: Detroit
Itís my camping vehicle. Thankfully for that reason I donít have to worry about rust. I donít go camping in the winter. Thatís one of the reasons I wonder about the high rpms, because thatís all it sees really.

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#4757711 - 05/15/18 09:17 AM Re: High RPMs on freeway. Toyota 4 cylinder longevity [Re: Number_35]
Kurtatron Offline


Registered: 04/06/10
Posts: 174
Loc: Detroit
Originally Posted By: Number_35
First of all, I covet your vehicle - I always loved those Previas, especially the early ones ('91?) with the 5-speed manual. They have the reputation here as being one of the most durable minivans of all time. (The other longevity champs are mostly RWD as well.)

I didn't know the Previa was geared that low - those revs sound really high. The engine is the 2.4 l, correct? Is it automatic? If so, are you sure it's shifting into 4th (O.D.)? (I just reread your post - you mentioned 5th gear, so your van must have coveted manual, and obviously you're in high gear.)

By comparison, our '90 MPV (2.6 l w/ 5-speed manual) ran at 2500 RPM @ 100 kph (62 MPH), which extrapolates to about 2800 @ 70 MPH, and 3000 RPM @ 75 MPH.

Our '97 MPV (3.0 l w/ 4-speed auto.) runs at about 2250 RPM @ 100 kph.

Our '09 Mazda 5 (2.3 l w/ 5-speed manual) runs at about 2700 RPM @ 100 kph.

I had read somewhere that Toyota reckoned that their engines ran at maximum efficiency at about half of redline, and at one time geared their cars accordingly, such that the engine would spin at half redline @ 55 MPH.

Be aware also that analogue tachs tend to read high - the actual RPMs may be 10% or more lower than indicated. Do you have a ScanGauge you could compare to?

What oil grade does Toyota spec for the Previa? It's too old for xW-20, so I would guess they spec'd 10W-30 down to 0 F, and 5W-30 below that, correct? I think you'd be fine with a stout 10W-30. Others here, far more informed than I am, can recommend a thick 10W-30.


Thanks haha. I have pretty much exactly what you mentioned. Itís a 91 5 speed. Itís specced for a 10w 30. I use redline 5w 30. Would that be a problem?

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#4757716 - 05/15/18 09:20 AM Re: High RPMs on freeway. Toyota 4 cylinder longevity [Re: Kurtatron]
JLTD Offline


Registered: 12/15/17
Posts: 835
Loc: US
Originally Posted By: Kurtatron
Do you guys think an oil analysis would be worth looking into? Would low wear numbers indicate anything? Or is it just a shot in the dark as far as determining high rpm effects.


A string of UOAs can be useful for nailing down the best OCI and seeing trends in your engine.
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