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Ford 400m oil suggestions #5416797 04/29/20 07:52 PM
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mpack88 Offline OP
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So my 75 LTD is coming up for a oil change, and was wondering what yall would suggest. Completely stock engine with 40k original miles. I know the inherent problems of these engines and from what I read they favor thicker oil. Right now I have hdeo 10w30 duragard ck4. Around 1200 zink 1100 phosphorous according to there spec sheet. I plan on installing a oil and temp guage. All dummy lights now which did come on at a drive through once but temp and oil combined to just one engine light. I believe it was temp related cause I had a Windsor thermostat in a Cleveland block. There is a difference. So what yall got?

Last edited by mpack88; 04/29/20 08:03 PM.
Re: Ford 400m oil suggestions [Re: mpack88] #5416817 04/29/20 08:14 PM
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nwjones18 Offline
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Our 77 F-150 with the 400 gets 10w-30 usually normal green Quaker state.


2016 Ram 1500 5.7 Hemi 30k QSUD 5w-20 Mopar filter
2008 Honda CRV 125K QSUD 5w-20 Fram ultra
2007 Mazda 3 2.3 130k 5w-30 syn-blend Denso filter
1988 F-150. 4.9 I6 251k. 10w-40 QSHM Motorcraft FL1A

Re: Ford 400m oil suggestions [Re: mpack88] #5416822 04/29/20 08:17 PM
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Chris142 Online Content
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That smog dog does not have much spring pressure at all. Any 10w-30,10w-40,15w-40 will be fine.


02 Wrangler Napa high milage 10w40
87 F250 Valvoline 15w40
07 fjcruiser Car lube plus 10w30
Z400 castrol T 10w40
Can am Maveric edge 5w40
57 case tractor Chevron sae30
Re: Ford 400m oil suggestions [Re: Chris142] #5416856 04/29/20 09:02 PM
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mpack88 Offline OP
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After I had the cats removed and smog pump deleted, I added true dual 2.25 exhaust with thrush mufflers, it feels like a whole new car.

Re: Ford 400m oil suggestions [Re: mpack88] #5417145 04/30/20 09:44 AM
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mpack88 Offline OP
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Any more suggestions? Surely we can have a debate with this topic?

Re: Ford 400m oil suggestions [Re: mpack88] #5417204 04/30/20 10:45 AM
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zrxkawboy Online Content
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Try a HM oil.


"Think of all the Ford owners who will someday want an automobile." John Dodge

Re: Ford 400m oil suggestions [Re: zrxkawboy] #5417207 04/30/20 10:46 AM
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mpack88 Offline OP
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Any brand?

Re: Ford 400m oil suggestions [Re: mpack88] #5417223 04/30/20 11:06 AM
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Duffyjr Online Content
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Rotella T5, VR 1 or just stick with the Duragard if those zinc and phos numbers are correct.


89 GMC Sierra Advanced 5w30/TG
08 Lucerne CX Advanced 5w30/TG
18 Toro Super Recycler T5 10w30
Re: Ford 400m oil suggestions [Re: mpack88] #5417226 04/30/20 11:06 AM
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ka9mnx Offline
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Ok. Synthetic or conventional, your choice. The engine came off the assembly line with 10w-30. ANY brand of 10w-30 now is light years better than what was available in 1975. Hard to find a bad oil today. Personally? I would use SuperTech Synthetic 10w-30. Why? Cheap, available and adequate. High Zn is not required, even back then. 600ppm is all that is required for stock engines and most oils are far above that. If the main seals are SEEPING (not blowing oil), try a HM oil. For engine cleaning I recommend Mobil1 HM 10w-30. Others say Pennzoil is also good but I have no experience with it.


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: Ford 400m oil suggestions [Re: mpack88] #5417753 04/30/20 08:44 PM
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Kruse Offline
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You say it's stock, so change the timing chain to an aftermarket set that doesn't retard the timing. It's not that big of a job. You'll want the plastic camshaft gear out of there anyways.
Those plastic camshaft gears usually fail way before 100K miles.

Re: Ford 400m oil suggestions [Re: Kruse] #5417781 04/30/20 09:26 PM
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mpack88 Offline OP
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I plan on doing that aswell. The engine has 40k original miles but still has 45 years of age. I might install a new RV cam aswell. Another one of my cars is getting a new chain cause I hear it slapping. A 1984 chrysler fifth avenue with a LA 318.

Re: Ford 400m oil suggestions [Re: mpack88] #5417850 04/30/20 11:29 PM
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Skitter302 Offline
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10w30 Full synth, with a Zinc add in from a brand of your choice. Did this in a few engines and put them to work in the upper RPM range. No issues what so ever.


"Skill is when luck becomes the usual."
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