I went to buy oil today to change in my truck and most of the diesel rated oils I found were 5w-40. I found Valvoline fully synthetic 5w-30 for $14 per gallon and I bought it. I won't put it in until I confirm it will work. What do you guys think?

 

I use RotellaT 5w-40 in mine.

 

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Same here 5w-40 Syn

 

Another here with R.T. 5w-40 syn. plan on using it year round.

 

thanks guys I think I will throw it in. The climate here in oregon is around 32 in the morning and up to 45 in the afternoon is this similar where you guys are from? Mike

 

here since my last oil change a few weeks ago its been everything from 5* to in the high 50's, no problems what so ever, as I mentioned I'm planning on running it year round.
Keep in mind the only diff between a 5w40 and a 15w-40 is the oil weight when its cold, both have a 40 weight when they are at operating temps, there is nothing wrong with running 5w-40 year round instead of a 10 or 15w-40, you will probably notice easier(quicker) starts when its cold as well as a little quicker warm up times as I have, but as I mentioned, at op temps, its all the same.
Hope this helps man.

 

30 weight is not recommended for summer temps depending on where you live.

 

I highly doubt the 5W-30 is diesel rated. You can't put gasser oil in a diesel, but you can put diesel rated oil in a gasser. I'm thinking about putting 5W-40 in the wife's truck just so I only have to buy one type of oil. 5 gallon jug of Schaeffer 9000 will do one OC in both our trucks...

 

just now realized he had said 5w-30, I guess I got carried away with the first sentence. Although I'm not sure if he meant 40 instead of 30

 

Oops I meany 5W-40, it is Valvoline Premium blue extreme full synthetic heavy duty diesel- Mike B

 

You are good to go then. I know alot of others that use that oil, some year around, some not, but none have had any negative feedback from their PSD.

 

where you from in Oregon?

 

I use the Rotella 5w-40. I noticed it fires quicker with this weight over the 15w. I was hoping the engine would turn over faster as I've heard, but I haven't experienced that.

 

Albany, 20 minutes south of Salem. Mike

 

Same here on firing quicker, the only thing that is making the engine turnover faster was the addition of the DB high torque starter