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stu
Dodge Dakota
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10/14/2005
21:58:01

Subject: 20w50
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Why is 20w50 synthetic oil recommended for supercharged motors?



Paul
Dodge Dakota
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10/15/2005
00:06:31

RE: 20w50
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wtf, where did you here that? ask the guy with the leafblower s/c.



Ha
Dodge Dakota
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10/15/2005
01:40:52

RE: 20w50
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Might as well use differential oil!



Craig
Dodge Dakota
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10/15/2005
02:42:51

RE: 20w50
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Don't think 20W50 is recomended in any modern engine. Mostly because tolerances are a lot closer. The thicker oils can't give you the lubrication that the thinner (5w30) can. Now on my 3.7 (don't know about the 3.9), if temperatures are over 100 (maybe it's 90), Dodge recomends I use 10w30. For temperatures UP TO 90 (or 100), Dodge recommends 5w30.

Where you get that supercharged engines need a heavier weight oil I do not know. But I can't imagine it being from a credible source. I can't think of a reason that the ENGINE would need a heavier oil because of a supercharger. I don't remember, but some of the GM 3.8L pontiacs (like the GTP I think) have a seperate oil resivoir for the supercharger (I think). I don't remember what weight the SUPERCHARGER called for. Might have been 20w50.

Oh well, hope it helps...



stu
Dodge Dakota
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10/15/2005
09:29:46

RE: 20w50
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I have buddies in a performance shop and when they install superchargers using the motors oil (like vortech) they will use the synthetic 20w50 (mostly royal purple or castrol syntech)



N56629
Dodge Dakota
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10/15/2005
10:57:39

RE: 20w50
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20w50 synthetic is the recommended replacement for 10w40. 10w40 is still common in race/hipro engines.



Craig
Dodge Dakota
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10/15/2005
16:11:27

RE: 20w50
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^^ yes but not in a modern motor that sees use on the road. I guess I overlooked the possibility of a race motor though- you would run a heavier oil in one probably...



2003 4.7
Dodge Dakota
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10/19/2005
23:19:21

RE: 20w50
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Had a '95 318 stock that ran 20/50 and a pint of STP from around 6000 to 314xxx.
Traded for the '03 with the 318 still burning tires and eating 5.0 stangs.
OH and got 18 mpg!



Kevin
Dodge Dakota
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10/20/2005
11:19:15

RE: 20w50
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for a stock 99 3.9 should I use 10w30 or 5w30. I live in northern connecticut very cold winters, and very hot summers. Temps range between 0degrees F and 90 degrees f



OBIO3
Dodge Dakota
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10/20/2005
18:38:24

RE: 20w50
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over 300,000 miles running STP ?? wow > must have had so much sludge in it knocking and burning oil was impossible > Everytime we tore an engine down it was apparent the owner was running STP or MOTOR HONEY in that poor thing > curious > you still using the STP in the 03 ?



2003 4.7
Dodge Dakota
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10/25/2005
01:36:33

RE: 20w50
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Tore the intake off of that 318, and was one of the cleaner engines ive been into.
I've torn down some that ran quakerstate and they were full of jelly. The STP has no effect on sludging if the oil is changed on a regular basis.
It adds more Zinc to the oil mix, that helps mains survive crank contact. That happens every time you hit the key when oil is in the pan or the ocassinal bounce off of the rev limiter.
I run about a quater pint in the '03. I'm kind of leery about the whole cam lubing top end kind of deal so I want a little thinner mix.
BTW the 318 DID NOT knock or use any oil in those 314,xxx



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