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Hello all,

I am curious to know how many of you're using the recently recommended Motorcraft(or other brand) 5/20 weight oil in the 1994-1997 4.6L T-birds/Cougars.

If yes, how do you like the results, and why did you switch to the 5w/20?

If not, what's your reason not to use this oil?

Thanks.
 

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I don't use it, but here are my thoughts. Conventional 5-20w has better lubricating qualities than 5-30w, but I think synthetic is better than either. I wouldn't use that wieght, because it doesn't provide you the protection at higher temperatures, it might be okay if you live in an area that has colder weather.
 

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I wouldn't recommend it..I tried it one time and i lived to regret it!!
It mainly depends on the mileage on your car. Although my Cat runs like a top, it does have just over 100k on the odometer. When cars get up there in mileage the tolerances "loosen up" a bit and a thicker oil is needed for maximum protection...I use 10W30 in my Cougar. I wouldn't even use 5w20 during even the coldest Wisconsin winter...the stuff is like water!!
Now....one time i brought my car to get the oil changed the place said the computer recommends 5w20 weight oil. I figured.."o.k. whatever"...not too long after i started noticing my oil guage was acting funny and i was blowing a little smoke out the tail pipes every now and then...:ztoohot:
Then i discovered the TCCoA forums and learned that 5w20 is a bad idea. So i brought my cat back where i went before to ask about this 5w20. They told me it was a mistake and that 5w20 is recommended for NEW Ford cars. So i got my oil rechanged with 10w30 and my guage problem went away and no more puffs of smoke...at all......
So...in other words...if you have a brand new focus or something..sure use it. If you're talking about a MN-12 that's getting up there in miles....not a good idea....at least that's my experiance and opinion.
Erik
 

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Just for the record, the 5w20 motorcraft is semi synthetic and is a specially formulated version of "conoco hydroclear". It is a good oil. But for a 4.6 with alot of miles on it, just stick with the 5w30.
 

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i have a few miles on my bird, and ask my tech about what oil to use and he told me if it was his, he would use 5w30, so i do, he said 5w30 or 10w30 is fine, but never use anything thicker than 10w30 cause it takes longer for the oil to get up to the lifters and stuff. he also told me not to use synth oil cause it will cause leaks in cars with over 50,000 or so.
 

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Palmguy said:
I use it on my 6k mi engine, it is the recommended oil for my motor and it seems to be great.
:zwthstpd:

Im putting it in my new 10k PI engine also
 

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I have used nothing but Motorcraft 5w20 from the day that I bought my '93 Ranger 2.3L when it had 8K miles on it. It now has over 220K miles and is still going strong. That Ranger was the best investment I have ever made. Even if it blows up today, I can't complain.
 

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People say synthetic causes leaks, but I have never had any problems with it. My brother had a Nissan Maxima and ran it with synthetic for 250,000 miles before he sold it and it never leaked. My car has over 130,000 miles and it doesn't burn oil or have any noticable leaks. Synthetic is so much better and I do not know why anyone would want to use anything else.
 

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i also worry about the thicker oil b/c of the added stress on the oil pump, i run 5w30 MC stuff, gotta love walmart :D
 

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Discussion Starter #12
Jer2g said:
People say synthetic causes leaks, but I have never had any problems with it. My brother had a Nissan Maxima and ran it with synthetic for 250,000 miles before he sold it and it never leaked. My car has over 130,000 miles and it doesn't burn oil or have any noticable leaks. Synthetic is so much better and I do not know why anyone would want to use anything else.
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I also think that the idea of synthetics "causing" leaks is wrong.

However I do believe(and have experienced) that in SOME cars that has been using dino oil from the beginning, if you suddenly switch to synthetic, it can "find" existing tiny leaks(mostly because syn.oil cleans away crud/sludge on the seals caused by dino), and start leaking.
This happened to me when I switched to syn.oil at 82k miles, and I lost about a qt of syn.oil per 3k miles compared to zero loss before; However, as soon as I switched to dino oil the consumption went down again, and all was back to normal.

If used from the beginning, syn.oil cannot and should not "cause" leaks. Switching from dino to syn however, is another story and results will depend on weight of oil, condition of seals, how clean the engine is at time of the switch...and a bunch of another stuff.
 
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