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Severe service? #5186167 08/13/19 04:13 PM
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mrjlube Online Content OP
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Hi guys,im running Motorcraft 5w20 in my grand marquis at 5,000 intervals. I am using the car for my job as a Private driver and car sits idling for 2,3 hrs. at a time 3 or 4 times a week. Based on this,what oil and interval would you suggest? Car has 23,000 miles,no consumption. 2004 Grand Marquis. Hope everyone is doing well. Thanks for any advice.

Last edited by mrjlube; 08/13/19 04:25 PM.

2017 Ford Escape ...ValvolineSynthetic 5w20

2009 kymco xciting 500...amsoil scooter oil...10w40

2001 Honda civic 5 speed 1.7.....Valvoline Maxlife 5w30
Re: Severe service? [Re: mrjlube] #5186179 08/13/19 04:21 PM
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littlehulkster Offline
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Just run whatever synthetic 5W30 you find for a good price.

Cop cars and taxis are used similarly, and I guarantee that the fleet managers for your local PD and Taxi company are using the cheapest oil they can. If you want some additional peace of mind, Rotella T6 would work just fine and isn't to expensive. Long idles are a reality for commercial vehicles, so I'd imagine the Rotella is designed to handle those sorts of things.

Last edited by littlehulkster; 08/13/19 04:23 PM.

2015 Mazda3 I 2.0
Re: Severe service? [Re: mrjlube] #5186192 08/13/19 04:43 PM
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Nitronoise Offline
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we ran QSUD 5w30 in our police fleet in CVPI's with a 4.6 when I was a trustee and fire and police commissioner ,, we had no issues , sometimes our cars caught 12 -15 hrs a day at idle ,,,,,,


07 Ford Freestyle 135K
06 Honda Acord EX 115K
04 Hyundai Sonata 290K sold
03 Hyundai Santa Fe 165K
02 Ford Tarus 98K
00 Buick Regal SC 135K
95 Goldwing 28K

Re: Severe service? [Re: mrjlube] #5186197 08/13/19 04:51 PM
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madeej11 Offline
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If you prefer staying with 5w20 I would suggest QSUD. It is probably on the thicker side and is usually a very good price.

Re: Severe service? [Re: mrjlube] #5186206 08/13/19 05:04 PM
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JLTD Offline
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Definitely 5W-30, It was the original specification for that engine.

If you are only going 5000 between changes, any synthetic should be able to handle that easily.


I use the overseas manual to choose my oil viscosity.

Using AMSOIL

Hers: 2008 Jeep Liberty 149k, SS5w30/Amsoil

His: 2015 4Runner 55k, SS 5w20/Amsoil

Re: Severe service? [Re: mrjlube] #5186296 08/13/19 06:58 PM
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blupupher Offline
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Stick with 5w-20 and 5,000 miles, why, because my opinion matters as much as everyone elses (not much at all).

Seriously, seems a lot of thin hate lately with absolutely no proof of any issues with it.
And the argument that "it was originally spec'ed for 5w-30" is not a valid argument, maybe engineers found that 5w-20 is a better oil for it (since 5w-20 was not around in abundance when the 4.6 modular was designed). And yes, CAFE played a part in it, but not all. I am still looking for the millions of 2v modular motors with engine failure due to 5w-20 being used.


2018 Santa Fe: PP 10W-30/OEM/5k
2018 Soul: Mobil Super 5W-20/OEM/5k
2012 xB: M1 EP 0W-20/CQ Blue/5k
2002 F150: Magnatec 5W-20/Bosch D+/1yr
1994 VT1100: Peak 15W-40/Bosch D+/1yr
Re: Severe service? [Re: mrjlube] #5186458 08/13/19 10:16 PM
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tiger862 Online Content
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I would put hour meter on vehicle and change every 200 hours.


Tiger862
2018 Grand Caravan
Re: Severe service? [Re: tiger862] #5186474 08/13/19 10:47 PM
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BlakeB Offline
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Originally Posted by tiger862
I would put hour meter on vehicle and change every 200 hours.

^ This.

Re: Severe service? [Re: mrjlube] #5186480 08/13/19 10:53 PM
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BlakeB Offline
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Re: Severe service? [Re: blupupher] #5186490 08/13/19 11:13 PM
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dave1251 Offline
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Originally Posted by blupupher
Stick with 5w-20 and 5,000 miles, why, because my opinion matters as much as everyone elses (not much at all).

Seriously, seems a lot of thin hate lately with absolutely no proof of any issues with it.
And the argument that "it was originally spec'ed for 5w-30" is not a valid argument, maybe engineers found that 5w-20 is a better oil for it (since 5w-20 was not around in abundance when the 4.6 modular was designed). And yes, CAFE played a part in it, but not all. I am still looking for the millions of 2v modular motors with engine failure due to 5w-20 being used.



This engine and engine family gets 5W20 on cheapo bulk in fleet use and the idle time in the desert is a lot more than the OP is stating for his vehicle. Then to top it off they are then immediately thrown into WOT after hours of idle.


make the inside of your engine oil cap white.
don't use.
Re: Severe service? [Re: mrjlube] #5186505 08/13/19 11:51 PM
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OilUzer Offline
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Severe service translation is : No xW20

Re: Severe service? [Re: mrjlube] #5186536 08/14/19 01:03 AM
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SlavaB Online Content
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Give Castrol Magnatec 5w30 a try. Makes my Kia so smooth, runs better than with any other name brand 5w20.


17 Kia Sportage EX 2.4 GDI / Mobil1 5w20, OE 26300-35505
15 MB GLA250 4Matic 2.0T / Mobil1 0w40, Hengst E818H
Re: Severe service? [Re: blupupher] #5186573 08/14/19 05:33 AM
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gfh77665 Offline
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Originally Posted by blupupher

Seriously, seems a lot of thin hate lately with absolutely no proof of any issues with it.


Its not "thin hate" to point out to readers of this forum the facts about CAFE. When an engine is spec'ed for 5-30 all around the globe except in the CAFE restricted USA, its very noteworthy. Even many owners manuals now say "adequate" protection with 5-20, instead of "optimal". "Hate" is way too strong of a word. The word that comes to my mind is "truth".

Re: Severe service? [Re: tiger862] #5186575 08/14/19 05:37 AM
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demarpaint Offline
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Originally Posted by tiger862
I would put hour meter on vehicle and change every 200 hours.

That's a very good idea. A UOA at the 200 hour drain would help in establishing just how far the oil can go, if the desire to find out is there.


God Bless Our Troops

Re: Severe service? [Re: mrjlube] #5186577 08/14/19 05:41 AM
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pbm Offline
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I'd compromise and use a 'thin' 5w30 synthetic like Pennzoil Platinum.

PS: Idling is probably tougher on an engine than regular driving so if I were idling a few hours a day I wouldn't go beyond a 5K OCI even on synthetic.


'Journalism is Dead'
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