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#1088780 - 02/18/08 08:28 PM Re: 5W20 VS. 5W30 VS. 10W30 [Re: Panzerman]
FZ1 Offline


Registered: 02/07/08
Posts: 4638
Loc: Texas
I think you are better off with a 0w or a 5w. It is stated that 70% of wear occurs with the cold start,so I think a lower cold viscosity might result in less wear. Just my .02.

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#1088787 - 02/18/08 08:42 PM Re: 5W20 VS. 5W30 VS. 10W30 [Re: FZ1]
Steve S Offline


Registered: 01/20/03
Posts: 18449
Loc: East of IGO
 Originally Posted By: FZ1
I think you are better off with a 0w or a 5w. It is stated that 70% of wear occurs with the cold start,so I think a lower cold viscosity might result in less wear. Just my .02.
unless the temps are so cold that the oil has trouble being pushed into the pump,thing of sucking a thick milkshake through a straw ,the wear comes from the pistons being oval ,the rings not sealing well,a richer mixture the heat activated oil additives not at their best temps etc, not the viscosity of the oil.
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#1088788 - 02/18/08 08:43 PM Re: 5W20 VS. 5W30 VS. 10W30 [Re: bamorris2]
Steve S Offline


Registered: 01/20/03
Posts: 18449
Loc: East of IGO
 Originally Posted By: bamorris2
 Originally Posted By: 02zx9r


Sorry, but I think that graph is meaningless. My truck is spec'd for 5w20 in all weather. But according to that graph, I should be running straight 40 weight..??.. (yes, my temps are petty much +50*F all year).
5w/20 is an epa mandate.
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Why do people post I want the best for my car,,, When there isn't anything that is the best on the car to begin with.

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#1088861 - 02/18/08 10:53 PM Re: 5W20 VS. 5W30 VS. 10W30 [Re: Steve S]
bamorris2 Offline


Registered: 06/21/07
Posts: 127
Loc: California
 Originally Posted By: Steve S
 Originally Posted By: bamorris2
 Originally Posted By: 02zx9r


Sorry, but I think that graph is meaningless. My truck is spec'd for 5w20 in all weather. But according to that graph, I should be running straight 40 weight..??.. (yes, my temps are petty much +50*F all year).
5w/20 is an epa mandate.


Maybe so, maybe not... But I have yet to see any solid/reliable report show that 5w20 provides less protection than any other oil (given that 5w20 is spec'd).

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#1088869 - 02/18/08 11:11 PM Re: 5W20 VS. 5W30 VS. 10W30 [Re: Steve S]
BuickGN Offline


Registered: 10/18/07
Posts: 3756
Loc: CA
 Originally Posted By: Steve S
 Originally Posted By: FZ1
I think you are better off with a 0w or a 5w. It is stated that 70% of wear occurs with the cold start,so I think a lower cold viscosity might result in less wear. Just my .02.
unless the temps are so cold that the oil has trouble being pushed into the pump,thing of sucking a thick milkshake through a straw ,the wear comes from the pistons being oval ,the rings not sealing well,a richer mixture the heat activated oil additives not at their best temps etc, not the viscosity of the oil.


Agreed.
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06 Acura TL. Lots of suspension and brake mods.

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#1088884 - 02/18/08 11:37 PM Re: 5W20 VS. 5W30 VS. 10W30 [Re: 02zx9r]
Merkava_4 Offline


Registered: 01/30/07
Posts: 17056
Loc: Clovis, CA
 Originally Posted By: 02zx9r


Wow. . . 10W-30 is good for -4F to +95F.

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#1088993 - 02/19/08 07:31 AM Re: 5W20 VS. 5W30 VS. 10W30 [Re: Merkava_4]
Titan Offline


Registered: 10/04/05
Posts: 2331
Loc: Charlotte Metro area
Xw20 weight oils only allow the Ford 4.6 Modular engine family to go a quarter of a million miles or even much more, often in taxi/limo-type service, with no oil-related problems. If the engine is designed for an Xw20, you do appropriate changes due to the conditions in which it is used, and the engine can outlast the rest of the vehicle.
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#1089011 - 02/19/08 08:08 AM Re: 5W20 VS. 5W30 VS. 10W30 [Re: Titan]
ChiTDI Offline


Registered: 12/19/03
Posts: 2193
Loc: Chicago IL
byez - those Toyota V6s fire up and run well with thin oil. I got one too. Lots of good UOAs with Mobil 1 and other "thin" oils in the Used Oil Analysis section. One guru stated that engine is tough on sheering, but you're in a climate with pretty severe low temps correct? Maybe a 5w30 synth would fit the bill.

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#1089033 - 02/19/08 08:57 AM Re: 5W20 VS. 5W30 VS. 10W30 [Re: ChiTDI]
Panzerman Offline


Registered: 12/16/06
Posts: 3998
Loc: Port Orange, Florida
The reliability of the 4.6 or alot of other engines, has far more to do with the superior designs of the motor then the oil going through it. Alot of those taxi/limos are operated on 10w30(alot cheaper in bulk) or some even fleet oils, such as 15w40(we did this for years in PA without incident).Remember, cars generally run a thicker oil in other countries without any less reliability or problems. Lubrication problems are unussual, its usually the lack of oil or neglected oil changes that lead to problems. The cooling and fuel problems are much more common. Iam starting to believe that the manufactures run the 5w20 in their most reliable engines to get the cafe advantages. The troublesome designs seem to still spec 5w30 or in some cases even 10w30.
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#1089103 - 02/19/08 10:34 AM Re: 5W20 VS. 5W30 VS. 10W30 [Re: ChiTDI]
ikeepmychevytoo Offline


Registered: 07/18/03
Posts: 661
Loc: Istanbul, Turkey
5w 30, 10w 30 and 30 are all limited at the 35C. So this possibly indicates that consideration for this temp. limit is nothing to do with the oils long term stability but the preferance for the engine.

edit: Now I saw this chart multiple times. If this chart doesn't belong to the manufacturer I wouldn't be concerned much.

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#1090719 - 02/21/08 06:58 PM Re: 5W20 VS. 5W30 VS. 10W30 [Re: Panzerman]
Fordiesel69 Offline


Registered: 09/10/05
Posts: 723
Loc: Erie, PA
 Originally Posted By: Panzerman
The reliability of the 4.6 or alot of other engines, has far more to do with the superior designs of the motor then the oil going through it. Alot of those taxi/limos are operated on 10w30(alot cheaper in bulk) or some even fleet oils, such as 15w40(we did this for years in PA without incident).Remember, cars generally run a thicker oil in other countries without any less reliability or problems. Lubrication problems are unussual, its usually the lack of oil or neglected oil changes that lead to problems. The cooling and fuel problems are much more common. Iam starting to believe that the manufactures run the 5w20 in their most reliable engines to get the cafe advantages. The troublesome designs seem to still spec 5w30 or in some cases even 10w30.


Agreed. The 4.6L is also not overpowered for its design. It burns very clean with minimal blowby, thus being very easy on the oil. Take the chrysler 3.5L for example, much harder on the oil, very powerful for its liters, and tends to shear the oil by 5k.

It really all depends on what the engine likes. With the price of fuel goin up, I truly think 10w-30 will become "old school" and with more public faith, 5w-20 will be the norm and 5w-30 will be the next best.

I myself still like 5w-30 and could go to 5w-20 but would like to see a few more success stories of it being just as good.
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