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Oil for a 1965 F100 Inline 6 with flat tappets and hydraulic lifters.... #5412713 04/25/20 10:59 AM
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cdherman Offline OP
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Well, I've been a bad boy and haven't paid much attention to state of the art, but I do know that they continue to change the oil formulation and what is good for my 2020 RAV4 would probably cause my 65 to throw a rod in 20 miles. I've not changed the oil in the 65 for several years (it gets very few miles), but its time.

I'm sure its been discussed, but I could not find it with search. Should I:

-- run a diesel engine oil?

-- buy conventional high mileage oil and add some ZDDP additive?

-- spend piles of money on Lucas or Amsoil oils specifically marketed for really old engines?

The engine leaks a little oil from the pan gasket and a little from the rear mail I think. By little, I mean 10 drops over the winter. But I would not want to try a synthetic or probably even a semisynthetic, unless one of you can argue very persuasively.

Thanks in advance, from a long time lurker.....


1965 F100 240 I6
2005 Forester X
2011 Prius
2016 Leaf
2014 Prius
Deere 4120 Tractor
Deere 425 Lawn Mower
Re: Oil for a 1965 F100 Inline 6 with flat tappets and hydraulic lifters.... [Re: cdherman] #5412719 04/25/20 11:02 AM
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CT8 Offline
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Just run HDEO oil with the best viscosity for your starting temps.


2015 F150 2.7
2018 F350 6.2
Re: Oil for a 1965 F100 Inline 6 with flat tappets and hydraulic lifters.... [Re: cdherman] #5412731 04/25/20 11:17 AM
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skyactiv Online Content
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I'd stay far away from Lucas oil. you don't have a high output engine with stiff valve springs. I bet SuperTech 5W30 will cause less wear than anything that engine saw years before I was born.


Wife: 15' Audi A4 quattro 6 speed manual
Me: 18' Elantra Sport 6 speed manual
The rude guy that points out reality


Re: Oil for a 1965 F100 Inline 6 with flat tappets and hydraulic lifters.... [Re: CT8] #5412733 04/25/20 11:17 AM
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skyactiv Online Content
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Originally Posted by CT8
Just run HDEO oil with the best viscosity for your starting temps.


Good recommendation. Rotella 10W30 would work well and not cause you to worry.


Wife: 15' Audi A4 quattro 6 speed manual
Me: 18' Elantra Sport 6 speed manual
The rude guy that points out reality


Re: Oil for a 1965 F100 Inline 6 with flat tappets and hydraulic lifters.... [Re: cdherman] #5412737 04/25/20 11:21 AM
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FordCapriDriver Offline
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Rotella 10W-30


1975 Ford Capri II Ghia 3000 V6 - 315k, Repsol Elite Super 20W-50
1988 Ford Escort XR3i Cabrio - 110k, Valvoline Maxlife 10W-40

Re: Oil for a 1965 F100 Inline 6 with flat tappets and hydraulic lifters.... [Re: cdherman] #5412740 04/25/20 11:23 AM
Joined: Apr 2008
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OVERKILL Online Content
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Originally Posted by cdherman
Well, I've been a bad boy and haven't paid much attention to state of the art, but I do know that they continue to change the oil formulation and what is good for my 2020 RAV4 would probably cause my 65 to throw a rod in 20 miles. I've not changed the oil in the 65 for several years (it gets very few miles), but its time.

I'm sure its been discussed, but I could not find it with search. Should I:


The old Ford i6's had very light valve springs and could run on any oil under the sun. These engines are NOT hard on oil and do not have extraordinary AW requirements.

Originally Posted by cdherman
-- run a diesel engine oil?

If you can get it cheap? Sure! It's certainly not going to hurt.

Originally Posted by cdherman
-- buy conventional high mileage oil and add some ZDDP additive?

Definitely not necessary, you do NOT need added ZDDP, an HM oil would be fine by itself and might help with your leak.

Originally Posted by cdherman
-- spend piles of money on Lucas or Amsoil oils specifically marketed for really old engines?

Avoid Lucas like the plague. It's like mixing dog faeces in with your steak sauce.

While AMSOIL makes some excellent lubricants, I doubt you are going to see a benefit from them in this application.

Originally Posted by cdherman
The engine leaks a little oil from the pan gasket and a little from the rear mail I think. By little, I mean 10 drops over the winter. But I would not want to try a synthetic or probably even a semisynthetic, unless one of you can argue very persuasively.

Thanks in advance, from a long time lurker.....


Then the HM oil (by itself, not defiled with additives) would likely be your best bet.


2019 RAM 1500 Sport - Mobil 1 EP 0w-20, FRAM Ultra
2019 Audi e-tron technik (my wife hates it)
Re: Oil for a 1965 F100 Inline 6 with flat tappets and hydraulic lifters.... [Re: cdherman] #5412854 04/25/20 01:25 PM
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65f100 Offline
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I've got the same engine. I've been running name brand 10W40 in it for the past 20 years.

Re: Oil for a 1965 F100 Inline 6 with flat tappets and hydraulic lifters.... [Re: cdherman] #5412976 04/25/20 03:52 PM
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cdherman Offline OP
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OK, well back to HDEO then. I was running Rotella oil from 2002 till 2016 which is probably the last time it was changed. Planning to generally swap/replace fluids given all the time I have on y hands.

Thanks for the replies.


1965 F100 240 I6
2005 Forester X
2011 Prius
2016 Leaf
2014 Prius
Deere 4120 Tractor
Deere 425 Lawn Mower
Re: Oil for a 1965 F100 Inline 6 with flat tappets and hydraulic lifters.... [Re: cdherman] #5413234 04/25/20 09:29 PM
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ka9mnx Online Content
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SuperTech. It's what my 300cu likes (but the synthetic version). A HM oil would be my choice for your engine (because of the oil seeps).


2005 Ranger 3.0 - SuperTech Syn 0w-20/Motorcraft
2000 4Runner 3.4 - SuperTech Syn 5w-30/Toyota
1997 B2500 Van 3.9 - M1 HM 10w-30/Mopar
1993 F150 4.9 - SuperTech Syn 5w-30/Motorcraft
Re: Oil for a 1965 F100 Inline 6 with flat tappets and hydraulic lifters.... [Re: cdherman] #5413266 04/25/20 10:34 PM
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SR5 Offline
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Here is a link to pair of Rotella T5 VOAs
A 15W40 and a 10W30, both should be suitable for your application and both have over 1000 ppm ZDDP with the modern CK-4 spec (zinc ~1200 ppm for the 15W40 and ~1100 ppm for the 10W30)

https://www.bobistheoilguy.com/forums/ubbthreads.php/topics/5346513/

I’m sure both are way better than any 1960’s oil


---------------------------------------------------------------------------------
Valvoline DuraBlend 10W40 SN & A3/B4 semi-synthetic + Valvoline V06 synblend media filter
Re: Oil for a 1965 F100 Inline 6 with flat tappets and hydraulic lifters.... [Re: cdherman] #5413278 04/25/20 10:51 PM
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CrAlt Offline
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T5 is my goto oil for anything that is flat tappet and stock spring.
It's good oil, don't ruin it with any snake oil additives.

Re: Oil for a 1965 F100 Inline 6 with flat tappets and hydraulic lifters.... [Re: cdherman] #5413367 04/26/20 06:43 AM
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+1 Rotella 10w30


2012 Ram 2500 SLT 6.7L Cummins 4x4
2018 Dodge Durango GT 3.6L 4x4
Re: Oil for a 1965 F100 Inline 6 with flat tappets and hydraulic lifters.... [Re: CT8] #5413380 04/26/20 07:14 AM
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4WD Online Confused
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Originally Posted by CT8
Just run HDEO oil with the best viscosity for your starting temps.


^^This … Delo, Delvac, and so on …

Re: Oil for a 1965 F100 Inline 6 with flat tappets and hydraulic lifters.... [Re: cdherman] #5413413 04/26/20 08:12 AM
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I'd just use a quality high mileage 10W-30, I'd be more worried about seals than any "wear"...

Re: Oil for a 1965 F100 Inline 6 with flat tappets and hydraulic lifters.... [Re: cdherman] #5413552 04/26/20 10:58 AM
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mpack88 Offline
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10w30 or 15w40 diesel oil is what I use in my older stuff aswell. Rotella, mobil delvak, Chevron delo all good choices.

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