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-   -   05' 4.7 WK oil (http://www.jeepgarage.org/f5/05-4-7-wk-oil-30026.html)

05quadratrac 10-23-2011 04:06 PM

05' 4.7 WK oil
 
OK i'm sure its been asked a million times but when I checked out Wkjeeps.com they said 5w20 oil so I go and buy it, as I open my hood the cap says 5w30. is the 20 good? I used it anyway, can't afford to be buying more Mobile 1 right now haha.

Scottina06 10-23-2011 04:10 PM

Re: 05' 4.7 WK oil
 
I would think it would be fine until you can change it.

2005JGC 10-23-2011 04:12 PM

Re: 05' 4.7 WK oil
 
nope, 5w30 is suggested for the early 4.7 design (used till approx 2008) the later design (with 16 spark plugs) uses 5w20

Scottina06 10-23-2011 04:22 PM

Re: 05' 4.7 WK oil
 
yep...Ive used 5w30 ext perform M1 from day 1

05quadratrac 10-23-2011 11:15 PM

Re: 05' 4.7 WK oil
 
Thanks for the replies. I rechecked WKJeeps.com and they have 05-10 with 5w20 listed for all those years which got me. I should have just checked under the hood but I've always assumed that site was pretty accurate. Oh well I don't think it should make much difference, I guess i'll find out haha.

bradley4kc 10-24-2011 01:13 PM

Re: 05' 4.7 WK oil
 
I always put 5W-30 in our '06 4.7 WK - never had any problems. Our '07 4.7 WK says 5W-20 on the filler cap. I did some research and found out that the 20 weight was used by the manufacturer to get better fuel economy when they ran their tests for fuel economy amongst there entire fleet of vehicles. I read that the average driver will not see a noticeable difference in fuel econ but when the manufacturer is looking at fuel econ regs for the entirety of there production line any small improvement helps their bottom line. In the end, either should be fine without doing any damage - but I would go with whatever it says under the hood.

robpp 10-24-2011 01:45 PM

Re: 05' 4.7 WK oil
 
Quote:

Originally Posted by 2005JGC (Post 502816)
nope, 5w30 is suggested for the early 4.7 design (used till approx 2008) the later design (with 16 spark plugs) uses 5w20

my 2007 4.7 has the 5-20 right on the oil cap.......and i have ONLY 8 plugs (early motor)


it was changed on the 4.7 for CAFE FUEL STANDARDS....nothing changed......the hemi for the MDS.

2005JGC 10-24-2011 06:00 PM

Re: 05' 4.7 WK oil
 
Good to know, thanks Rob!

05quadratrac 10-25-2011 02:00 AM

Re: 05' 4.7 WK oil
 
Thanks guys, I appreciate the replies, if the 07's have it on the cap it should run just fine in my 05 4.7. I really didnt feel like draining it and buying another 6 quarts, that mobile 1 gets kind of pricey on my budget. :D


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