4.7 Owners: 5w-20 oil???
#21
An SAE viscosity grade is used to specify the viscosity
of engine oil. Use only engine oils with multiple viscosities
such as 5W-30 or 10W-30. These are specified
with a dual SAE viscosity grade which indicates the
cold-to-hot temperature viscosity range. Select an
engine oil that is best suited to your particular temperature
range and variation. For 3.7L/4.7L engines SAE
5W-30 engine oil is recommended for all operating
temperatures. For 5.7L engines SAE 5W-20 engine
oil is recommended for all operating temperatures-
.These engine oils improve low temperature starting
and vehicle fuel economy. Refer to your engine
oil filler cap for the recommended engine oil viscosity
for your vehicle.
#22
Join Date: Jul 2007
Location: South Georgia/East Florida
Posts: 24,686
Likes: 0
Received 20 Likes
on
19 Posts
and hence MY reason for this post! My owners manual AND cap say 10w-30, I've always used 10w-30 either Mobil 1 or RP. I take advantage of a dealer coupon because of the free rotation I was due for and they stick in 5w-20 (not even one grade thinner 5w-30) and tell me Chrysler "changed" the specs.
I still ain't crazy about it...
I still ain't crazy about it...
#25
#26
My 4.7 HO oil cap says 5w-20. I can't imagine there would be any adverse effects to using it, especially if it's full syn. Unless your engine already has a sludge issue, and the thinner oil breaks it up and carries to, and clogs up oil passages. You may also want to keep an eye on the oil level, as the thinner oil can get by the rings a little easier....but this is usually very minimal. Also, if you have a seal leak, it will intensify that problem.
I really wouldn't worry about any blow by. The benzes and bimmers that use 0w eat a rediculous amout of oil. Just keep an eye on that level until you know what to expect from it.
I really wouldn't worry about any blow by. The benzes and bimmers that use 0w eat a rediculous amout of oil. Just keep an eye on that level until you know what to expect from it.