Oil question 5.7 v8

[stant1man]

Volvo recommends Sae30 oil.

Am I correct in saying a 5w30 or a 10w30 will have the the same +/- viscosity at running temp as the Volvo Sae30?

My local volvo penta dealer was going to sell me 15w50 :-S

 

[Scott Danforth]

Re: Oil question 5.7 v8

I personally run 15W40 diesel oil in my older 5.7 to get enough zinc for the cam.

Volvo buys their oil from one of the many petroleum companies just like every other engine maker. it is most likely valvoline or mobile.

technically the oil viscosity should change with the ambient temperature. in cold climates I would run 10W30, in high temp climates 15W40. 15W50 is too thick in my mind to run on the boat unless you experience high engine temps or oil temps.

I do recommend synthetic oil.

 

[Howard Sterndrive]

Re: Oil question 5.7 v8

Am I correct in saying a 5w30 or a 10w30 will have the the same +/- viscosity at running temp as the Volvo Sae30?

no, not even close

at operating temp, oils similar to SAE30 are: 20W50 and 25W40

I'm sure 15W50 is pretty close to SAE30 too, but I don't have it on my chart

 

[stant1man]

Re: Oil question 5.7 v8

no, not even close

at operating temp, oils similar to SAE30 are: 20W50 and 25W40

I'm sure 15W50 is pretty close to SAE30 too, but I don't have it on my chart

From my research it seems that 5w30 stands for 5Winter SAE30. Are monograde SAE30's different to multigrade?

 

[Scott Danforth]

Re: Oil question 5.7 v8

my chart lists

SAE 30 at 12.2 cSt @100C
SAE 40 at 14.58 cSt @100C
SAE 40 at 19.34 cSt @100C
SAE 5w30 at 10.5 cSt @100C
SAE 10w30 at 11.27 cSt @100C
SAE 15W40 at 15.6 cSt @ 100C

 

[Howard Sterndrive]

Re: Oil question 5.7 v8

As I understand it, 5W30 is made from a base oil of 5 weight, then thickeners are added to make it "act" like a 30 when hot.
I have been told that when the oil gets near the end of it's life cycle, the thickeners aren't as effective as they were when the oil was new.

Whereas, if you put SAE30 in, 300 hours later, it's still SAE30 (+ dirt, + wear materials + combustion byproducts + moisture etc., but you don't have to worry about the VI improver additives breaking down)

Scott's chart shows 15W40 very close to 40 in viscosity (slightly closer than mine does), and 10W30 only somewhat thinner than 30, but for new oil. (I would assume)

If changed frequently enough, it seems multigrades would be fine.

In the end, there's a lot of analysis going on so you can grab one jug off the shelf instead of the one next to it on the shelf.
Can always just get what is recommended..

 

[Howard Sterndrive]

Re: Oil question 5.7 v8

Volvo recommends Sae30 oil.

btw, that needs to be referenced with caution if someone is referencing this thread in a future search.
VP use to put engine oil coolers on just about every engine and with an oil cooler, they almost always recommended 10W30

 

[Scott Danforth]

Re: Oil question 5.7 v8

viscosity modifiers are in every oil regardless of single viscosity or multi viscosity, and all oil suffers thermal and viscosity breakdown, even straight weights. and if you think that brand a or b is vastly different, please tell me what separates them in the pipeline or ship. the modifiers and additives are added after the pipeline prior to distribution by companies A, B, C, etc.

if you have a doubt, run synthetic. as Bubba1235 stated, put quality oil in and call it a day.

 

[bruceb58]

Re: Oil question 5.7 v8

The Volvo factory service manual clearly states that "the use multiviscosity oils such as 10W-30 and 10W-40 is NOT recommended".

I use Mobil 1 15W/50
Stole this picture from another poster:

 

[Howard Sterndrive]

Re: Oil question 5.7 v8

The Volvo factory service manual

they have several manuals and they do not all state that, but yes some manuals do where the engines referenced do not have oil coolers

 

[bruceb58]

Re: Oil question 5.7 v8

I looked at his previous posts. He has a 2000.

My Volvo LK model 7.4L in my sig has an oil cooler and the LK service manual states no 10-40 or 10-30

 

[kilowatts]

Re: Oil question 5.7 v8

Hi Guys:

I hate to add to another oil thread but if Volvo recommends 30wt oil, why would you want to put something else in it? It's about the cheapest oil available. That's a good thing, right?

kilowatts

 

[Howard Sterndrive]

Re: Oil question 5.7 v8

why would you want to put something else in it?

My local volvo penta dealer was going to sell me 15w50 :-S

you'd have to ask that question at his dealer I suppose - probably better markup

if the question is why, the answer is usually money