whats a good oil weight for a 04 1500 4.7 i have been using 5w30 synthetic blend, i just wanted another opinion from someone who has more experiance. thanks

 

You'll get a lot of varying opinions here on this one. I use 10w30 full synthetic and have been happy, but I haven't had the truck that long. 22,000 miles to be exact. Just be careful if you go to get your oil changed..... a lot of those guys think that b/c it's a truck you need some crazy oil like 10w40 or 20w-someting..... it amazes me.... I had to argue with them just to get them to put 10w30 in one time at Jiffy Lube... I just got in the cab and said I'd drive off if they didn't. Never went back.

 

The manufactures started recomending 5w30 not because it's better for the engine but becaause the goverment said they had to use and recomend
the same oil they used for the EPA milage and polution cerifictions. (by law they had to lower thier fleet mpg average and going with a lighter oil helped them do that)
I recomend 10w40 for most of the US and Mobil 20w50 for summers in Florida. (it gets d*mm hot done here) You will get a lot longer engine life.

 

I'm running 5w-30 full synthetic in my Hemi and it's great. Come summer when it's up to 100 deg, I'll probably swith to 10w-40.

 

This is ridiculous. These oil weights will NOT give you longer engine life. 5W-30 for the 4.7 and 5W-20 for the Hemi...those oils will give you great performance and better gas milage. There is no need whatsoever for a 10W-40 or 20W-50 in that engine...none. People who push that are speaking on nothing more than a myth.

 

I just do what the manufacturer recomends... with all my other trucks I've always done it my way with oils and never had a problem... but when I buy a brand new truck- I say go with the factory recomendation



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I have 40 years experiance building high performance engines and 10 years of doing consulting work for Ford, GM and Chrysler.

What are your qualifications???

 

Come on over: http://theoildrop.server101.com/forums/ubbthreads.php We get people with your "experience" all the time, and it really doesn't mean squat. Used oil analysis is the true test of an oils protection of an engine, and time and time again it is proven that these weights that you keep preaching about (10W-30 and 20W-50) are not great for engine life, and they most certainly are not better than the 5W-30's and 5W-20's in engine life protection. Gas mileage with them is awful as well. My God, those weights are something you want for big rigs and s**t. You're old school, and it's time to get with the program and lose the old school oil myths. Those weights aren't for the 4.7 or the Hemi...no matter what the temperature.

 

Mobil 1 0W-40 is factory fill for all 6.1L engines. DCX has done millions of durability miles with it, with excellent results.

 

Yeah, it's a great oil. 0W-20 is an outstanding oil weight as well.
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