5W-20 question

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233
Location
Pullman WA
I've got a 97' Mustang with the 4.6, it recommends 5W-30 but I've been tempted to try the motorcraft 5W-20. How far back has Ford okayed the use of 5W-20 in their vehicles? Thanks
 
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4,660
Location
The Garden State
If you're using a dino 5W-30 then I'd give the Motorcraft 5W-20 a shot. It seems to be a higher quality oil than the dino 5W-30's and shows really good wear numbers in the Ford modular engines. If you're using a quality true synthetic such as Mobil 1, Redline, RP, Amsoil or even the Schaeffer 7000 series blends and you're happy and don't mind paying the extra, stick with those, especially if you change your oil at 5,000 plus miles. But if you change your oil in the 3,000 mile to 5,000 mile range then the Motorcraft 5W-20 is hard to beat for protection and value. Whimsey
 
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7,788
Location
Oklahoma
But first and utmost....WHY do you want to go with a 5W-20 in the 'Stang????? A 5W-30 would be the absolute minimum I'd run in a V8.
 
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4,660
Location
The Garden State
quote:
Originally posted by Schmoe: But first and utmost....WHY do you want to go with a 5W-20 in the 'Stang????? A 5W-30 would be the absolute minimum I'd run in a V8.
"Oh ye of little faith" [Big Grin] . Dino 5W-30's shear down to 20 weight oils within 2,000-3,000 miles it seems. If it's going to shear down to a 20 weight oil why not start with a more shear stable 5W-20 oil. Plus the 5W-20's are using a Group II/II+ and or Group III as base stocks to meet Ford's spec's. They have to meet much higher standards than dino 5W-30 oils. Do yourself a favor and research the UOA's using 5W-20 oil. Especially the one's that used Motorcraft 5W-20 with the V-8 and V-10 Ford modular engines. Whimsey
 
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4,660
Location
The Garden State
quote:
Originally posted by darkdan: Exactly, so kick the dino the curb and grab a group IV 5w30. =)
OK, I guess I just don't understand the Midwestern dialect [I dont know] [Big Grin] . Whimsey
 
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4,933
Location
Lakeville, MN
Ford has back recommended 5w20 through the earliest of the 4.6l motors at this point. Shouldn't be a problem switching to it in a '97. I switched my '97 F150 with the 4.6 to 5w20 at 162,000 miles on the odometer with no ill effects... (Still running fine at last cheack - I sold it...)
 
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28
Location
New Jersey
well i just picked up 6 quarts of the 5w20 motorcraft from wallie world. Im going to give it a shot. Been using m1 full syn. 10w30 then swtitched to 5w30. Getting a little expensive at 3000mile int.
 
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450
Location
The Bay Area
I just had a friend blow a "bulletproof" 4.6L "PI" mustang engine (2002 GT). The oil that was in the engine when it blew: 5W20 weight Motorcraft. All I knew is that he had 40,000 miles on that engine, and now he will be buying a forged longblock to replace it. Mustangs are built to be abused. Whether that statment is true or not, many mustang owners abuse their engines, so that is why I balance out the equation of CARE vs ABUSE. The more you abuse your stang, the more you have to care for it. This is Why I put Red Line 5W30 in my 03 GT, which runs in the high 12s in N/A form. 20 weight may be okay for conservatively driven street vehicles, but if you are going to put any stress on that motor, go with a 30 weight.
 

Patman

Staff member
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22,017
Location
Guelph, Ontario
quote:
Originally posted by 97flairside: well i just picked up 6 quarts of the 5w20 motorcraft from wallie world. Im going to give it a shot. Been using m1 full syn. 10w30 then swtitched to 5w30. Getting a little expensive at 3000mile int.
So run it longer than 3k! Problem solved. [Smile]
 
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7,788
Location
Oklahoma
Whimsey, read m150's post, that's what I'm talking about. Most people will occasionally dog the 'Stang....why??? Because they can and it's a 'Stang. Now, do you want that watered down oil in that crankcase when you stomp the be-jesus out of it? The common UOA's will show that the engine is fine, however, I really wonder what other things would pop up if you had a detailed more expensive UOA done. 5W-20 is CAFE. That's all there is to it.
 
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1,381
Location
Southeast Kentucky
If you have run the 30 weight for the past 7 years, I would be hesitant to change this late. As much as 5w30 dino is dogged for thinning out, there have been a lot of vehicles clocking high miles using it. I think the key is changing it at reasonable intervals. For the reocord, MC 5w20 appeears to be good stuff and I am going to use it for winter oil (-49 pour) in my '02 ranger post warranty.
 
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450
Location
The Bay Area
I've had 3 4.6L SOHC engines, two with PI heads, cams, etc. The lightest oil I've ever put in them is a 5W30. The 97 Lariat has almost 209,000 miles on the engine with *NO* problems. At the 200,000 mark we decided to have a compression check done on all the cylinders. Virtually no wear served as evidence to the effectivness of a 10W30's (Mobil 1) ability to lubricate this particular modular engine. One question remains: If you can SAFELY run a 10W30 weight oil and expect virtually no wear-out after 200,000 miles of service, why did Ford/Honda decide to run a lighter weight oil in all of their cars/trucks? Food for educated thought. PS- I'm not saying that 5W20 cannot effectively lubricate the *conservatively* driven street vehicle, nor am I saying that the UOAs posted on this board are not reflective of a potential for a great energy conserving lubricant, but 5W20 is not going in any of my engines until I have seen, with my own eyes, engines that have been run and tested for hundreds of thousands of miles on 5W20. In short, there is no reason for me to switch from a 30 weight oil to a 20 weight.
 
Messages
450
Location
The Bay Area
quote:
Originally posted by 02supercrew:
quote:
Originally posted by mf150: I just had a friend blow a "bulletproof" 4.6L "PI" mustang engine (2002 GT). The oil that was in the engine when it blew: 5W20 weight Motorcraft. 20 weight may be okay for conservatively driven street vehicles, but if you are going to put any stress on that motor, go with a 30 weight.
How sure are you that it was the oil it self? Dont suppose you had a UOA done on the oil to actually determine if it really was the oil? And if it was really the oil, there would be a whole pile of cratered motors as a result from that bad batch of oil that your friends motor got. Seems to me QS had something like this happen way back in the day. Sorry, I have a hard time buying that your mustang sees more abuse that any mod motor in any Ford Truck in general. I'm currenty looking at 5 V-10 service body trucks that all have over 250K on plain ole MC 5-20, and that's not counting the other 15 various mod motor trucks we have, all have more than 70K each. Not to mention all the good UOA's of MC 5-20 on this board.

Sounds like your defense of MC 5W20 is primarily based on "good UOAs." Besides that, all your doing is falling into teh same "sin" catagory as me...expressing personal experience. my mustang has drag radials on it during the summer weekends. It also can run the drag strip at a higher/faster speed than a number of mustangs out there. I have a FRPP 4.30 ring and pinion, Moser 31 spline axles, Eaton Posi set-up for teh rear-end alone, which revs teh engine higher at all RPMs. lets not get into what I've done with the rest of the car. In short, it's set-up for naturally asperated drag racing, which in fact does put more stress on a car engine that or a normally driven/towing truck. As I mentioned before, I'm not saying that 5W20 is goign to cause problems, but after all the money I've spent on my ride, there is no way that I will put a 520 weight in the heart of it all.
 
Messages
1,181
Location
NJ, USA
quote:
Originally posted by mf150: my mustang has drag radials on it during the summer weekends. It also can run the drag strip at a higher/faster speed than a number of mustangs out there. I have a FRPP 4.30 ring and pinion, Moser 31 spline axles, Eaton Posi set-up for teh rear-end alone, which revs teh engine higher at all RPMs. lets not get into what I've done with the rest of the car. In short, it's set-up for naturally asperated drag racing, which in fact does put more stress on a car engine that or a normally driven/towing truck. As I mentioned before, I'm not saying that 5W20 is goign to cause problems, but after all the money I've spent on my ride, there is no way that I will put a 520 weight in the heart of it all.
I don't blame you one bit. Even though I run 5w-20 exclusively, I too would think long and hard before I ran it in your car.
 
Messages
4
Location
New Haven, CT
I have a close relative working at a Big Three dyno room and this relative says absolutely do not use 5W-20. The 5W-20 oil was edicted by upper management with no money to support engine improvements. This company now finds itself with oil related engine failures at durability dyno test, where they were uncommon before switching to 5W-20.
 
Messages
4,660
Location
The Garden State
quote:
Originally posted by mf150: As I mentioned before, I'm not saying that 5W20 is goign to cause problems, but after all the money I've spent on my ride, there is no way that I will put a 520 weight in the heart of it all.
I don't blame you. I would not run 520 weight either. In fact as adventuresome as our Australian friends are in using thick motor oils I dont think they've gone past 70 weight [Big Grin] . Just busting your chops guy [Smile] . Sound like one nice car and a hot set up. I don't blame you for not using 5W-20. I'd do what you are doing, use a good synthetic like the the Redline. Although with your hot set up I'd considering using the 10W-30 Redline instead of the 5W-30. It's probably more shear stable [I dont know] . For myself with my truck and it's 4.6 the 5W-20 has worked real good as a year round oil. But it's not stressed like your Mustang. There are oils out there that suit every need. It's up to you to find that oil. This site is great in allowing us to share such a diverse experience with many oils and engines [Cheers!] . Oh, and I don't think Ford built the Mustangs to be abused. Driven maybe "slightly" more aggressively, yes, abused, no. Even your real big buck exotic European cars were not built to be "abused". Just driven in an "enthusiastic" manner [Big Grin] . Whimsey
 
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