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Oil for 1985 Nissan Pickup. Is high ZDDP required? #5135099 06/15/19 04:08 PM
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Hal9000 Offline OP
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Getting read to change oil on a 1985 Nissan Pickup (2.4, automatic) with 99K miles. I have some conventional Pennzoil High Mileage 10w-30 that has been sitting in the garage for around 3 years or so. I was going to use that and a Fram Tough Guard (what Walmart had).

Googling around the internet I see some people saying that an older flat tappet engine like this should have an oil higher in ZDDP. And, there's no better place on the internet than here to ask an oil-related questions. smile

Is the Pennzoil High Mileage 10w-30 fine? I definitely want to keep the truck for many years, so if it's not I'd certainly be willing to go buy something else.

And, out of curiosity, oil sitting for 3 years in a bottle should still be good, right?

Thanks.

Last edited by Hal9000; 06/15/19 04:11 PM.
Re: Oil for 1985 Nissan Pickup. Is high ZDDP required? [Re: Hal9000] #5135102 06/15/19 04:11 PM
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JohnnyJohnson Offline
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LOL its an 85 any oil you run will be better than it had in 1985.


2004 Corolla 137003
Out: Havoline Pro DS 10w-30 Purolator PureOne 10-29-19 136457
In: Pennzoil Platinum HM 5W-20 ST 4386
2006 Duramax 76703
Out: T6 5W-40 XG9100 73705
In: Rotella Dino PH9100 11-3-19
Re: Oil for 1985 Nissan Pickup. Is high ZDDP required? [Re: Hal9000] #5135105 06/15/19 04:15 PM
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talest Offline
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KA24E.

Use that three year old oil on that 34 year old Datsun/Nissan and enjoy it.

Back To The Future truck was a Toyota 4x4. Similar but different look than yours.

Re: Oil for 1985 Nissan Pickup. Is high ZDDP required? [Re: Hal9000] #5135106 06/15/19 04:17 PM
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Cujet Offline
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I'm sure that oil is fine. I think that engine is a SOHC and therefore not really a flat tappet design. I owned one back then and going by memory about the SOHC thing.

By the way, mine lasted a very long time and the subsequent owner had a couple hundred thousand miles on it.

But like all engines with a timing chain, it's good to use a quality oil and change it frequently.

Last edited by Cujet; 06/15/19 04:19 PM.

People who count on their fingers should maintain a discreet silence.
Re: Oil for 1985 Nissan Pickup. Is high ZDDP required? [Re: Hal9000] #5135111 06/15/19 04:29 PM
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dave1251 Offline
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Pennzoil HM is a good fit for your truck enjoy!


make the inside of your engine oil cap white.
don't use.
Re: Oil for 1985 Nissan Pickup. Is high ZDDP required? [Re: Hal9000] #5135175 06/15/19 06:12 PM
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Nissan pickup engines were all OHC, so no flat tappet concerns with these engines.


96 Grand Prix SE (project car)
04 Odyssey EX 200k Philips Shield Choice 10w-30
96 Maxima GLE 275k Shell Rotella T5 10w-30
07 Chrysler Pacifica Limited 4.0L 145k Mobil1 EP 0w-20
Re: Oil for 1985 Nissan Pickup. Is high ZDDP required? [Re: 92saturnsl2] #5135233 06/15/19 07:30 PM
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expat Offline
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Originally Posted by 92saturnsl2
Nissan pickup engines were all OHC, so no flat tappet concerns with these engines.



So maybe not flat tappet, but if a flat rocker acts on a cam, is that not the same thing?

Re: Oil for 1985 Nissan Pickup. Is high ZDDP required? [Re: Hal9000] #5135246 06/15/19 07:41 PM
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Gokhan Offline
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Originally Posted by Hal9000
Getting read to change oil on a 1985 Nissan Pickup (2.4, automatic) with 99K miles. I have some conventional Pennzoil High Mileage 10w-30 that has been sitting in the garage for around 3 years or so. I was going to use that and a Fram Tough Guard (what Walmart had).

Googling around the internet I see some people saying that an older flat tappet engine like this should have an oil higher in ZDDP. And, there's no better place on the internet than here to ask an oil-related questions. smile

Is the Pennzoil High Mileage 10w-30 fine? I definitely want to keep the truck for many years, so if it's not I'd certainly be willing to go buy something else.

And, out of curiosity, oil sitting for 3 years in a bottle should still be good, right?

Thanks.

No, you do not need higher ZDDP for flat tappets with today's modern oils.

However, you do need a thicker base oil for flat tappets. The viscosity your valvetrain experiences is the base-oil viscosity at the given oil temperature because of the ultrahigh shear rates in the valvetrain, not the kinematic or HTHS viscosities. A 15W-40 HDEO is by far the best choice, especially in your climate. The base oil will not get much thicker than that.

10W-30, especially a high-mileage one or an HDEO 10W-30 is OK if your climate does not allow a 15W-40. There is no HTHS viscosity data on Pennzoil HM 10W-30 but it's probably around 3.4 cP and the base oil should be moderately thick as well, although not nearly as thick as that of a 15W-40.

Avoid 5W-30, as the base oil will be too thin for flat tappets. Valvoline Advanced Synthetic 5W-30 could be an exception.

Oils have at least five or more years of shelf life. Shake the bottle before use.

If anyone asks the flat-tappet question again, the answer is any modern 15W-40 HDEO and the ZDDP level does not matter.

There is also Amsoil ACD 10W-30/SAE 30, which is perfect for flat tappets, as it has a very thick base oil because it is a monograde, but it's expensive.


2020 Toyota Prius Prime XLE plug-in hybrid, 2ZR-FXE engine, ~ 0,000 mi
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Re: Oil for 1985 Nissan Pickup. Is high ZDDP required? [Re: dave1251] #5135293 06/15/19 08:19 PM
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bbhero Offline
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Originally Posted by dave1251
Pennzoil HM is a good fit for your truck enjoy!



I agree with dave1251... Pennzoil HM.


Nissan Altima 3.5 Coupe
Cam2 Dexos1 Gen 2 5w30 Wix 57356 Oil filter
"Treat your family like your friends and treat your friends like your family."
Re: Oil for 1985 Nissan Pickup. Is high ZDDP required? [Re: Hal9000] #5135399 06/16/19 12:33 AM
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FordCapriDriver Online Content
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SOHC doesn't mean it's not flat tappet.... i haveppen to have a SOHC flat tappet engine in my Escort.

The camshaft is in the head, and the hydraulic flat tappet lifters ride on the cam, which push up directly on the rocker.

Last edited by FordCapriDriver; 06/16/19 12:34 AM.

1975 Ford Capri II Ghia 3000 V6 - Repsol Elite Super 20W-50
1988 Ford Escort XR3i Cabrio - Shell Rimula R4X 15W-40 HDEO

Re: Oil for 1985 Nissan Pickup. Is high ZDDP required? [Re: Cujet] #5135402 06/16/19 12:35 AM
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Originally Posted by Cujet
I'm sure that oil is fine. I think that engine is a SOHC and therefore not really a flat tappet design. I owned one back then and going by memory about the SOHC thing.

By the way, mine lasted a very long time and the subsequent owner had a couple hundred thousand miles on it.

But like all engines with a timing chain, it's good to use a quality oil and change it frequently.


There are various designs of SOHC valvetrains, some do actually have lifters like the ones you would find in a pushrod engine.


1975 Ford Capri II Ghia 3000 V6 - Repsol Elite Super 20W-50
1988 Ford Escort XR3i Cabrio - Shell Rimula R4X 15W-40 HDEO

Re: Oil for 1985 Nissan Pickup. Is high ZDDP required? [Re: Hal9000] #5135453 06/16/19 05:18 AM
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Linctex Offline
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Originally Posted by Hal9000

And, out of curiosity, oil sitting for 3 years in a bottle should still be good, right?


Yes, I still have oil in the bottle left over from the 1990's - it's perfectly fine and never goes bad if stored properly.


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: Oil for 1985 Nissan Pickup. Is high ZDDP required? [Re: Hal9000] #5135506 06/16/19 07:07 AM
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KA24E - that's the head and cam used for seq. IVA valvetrain wear tests.

It's like a Honda Civic SOHC design without the VTEC.

Remember too High ZDDP = Cam and follower wear.


2019 VW Jetta S 6MT OCI#1 5885mi-Castrol Edge Prof? VW508+VW Service Filter; '17 Subaru Crosstrek CVT OC#7 52665mi-Castrol GTX Magnatec 5W20 + SOA Filter
Re: Oil for 1985 Nissan Pickup. Is high ZDDP required? [Re: Hal9000] #5135639 06/16/19 10:08 AM
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Hal9000 Offline OP
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Thank you for all the responses thus far. Here are a few pics of the vehicle.

She's an ideal runabout/Home Depot vehicle. These older trucks that are low to the ground are so easy to load/unload. It's also extremely easy to park, and has power steering even. Now, obviously it's not going to pull a huge trailer or boat, and with the three speed automatic it isn't going to win the Cannonball Run. It's the 'Sport Truck' trim level, which I presume got you bucket seats in blue plaid and a snazzy ST decal. However, it apparently didn't include AC.

[Linked Image]

[Linked Image]


Last edited by Hal9000; 06/16/19 10:12 AM.
Re: Oil for 1985 Nissan Pickup. Is high ZDDP required? [Re: Hal9000] #5135643 06/16/19 10:12 AM
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Does this truck have the engine with two spark plugs per cylinder?

I almost bought a Datsun 4x4 with that motor. Really nice truck. I wish I had.


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Havoline Pro DS 0w20
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