Mixing VR1 synth with 5w40 euro

[addyguy]

A synthetic 15W-40 would be my choice; they are very stout, and cold weather is not an issue.
Would love to see pics of this beast!!

 

[SOUNDMAN5000]

OP, You sound like my old neighbor... He would mix 2 quarts of this oil and 2 quarts that oil to hit that exact oil spec he had in his head that he thought his car needed. I thought he was crazy but that was 15+ years ago and he had close to 400K Miles on his old early 90's Pontiac Sunbird THEN! I passed him about a year ago still driving that same OLD car so who am I to say don't do it?
I know all motor oils can be mixed but I wouldn't do it.

 

[RDY4WAR]

A synthetic 15W-40 would be my choice; they are very stout, and cold weather is not an issue.
Would love to see pics of this beast!!

It depends on the brand. Most common major brands, their 15W-40 synthetic is no better than their 5W-40 and sometimes worse. The narrow multi-grade means they can meet the spec with cheaper, lower quality base oils and VII. Since they're all in a race to the bottom, they happily exploit the lower production cost. (with no corresponding drop in retail cost, of course)

 

[tired]

A 10W-30 is 900-1,000 cSt @ 20°F. By comparison, a 5W-30 is 600-700 cSt @ 20°F.

While a 10W-30 is technically pumpable down to -14°F, you don't want to make the oil pump (and starter) struggle harder than they need to. I also don't like the idea of pushing tree sap through a cellulose filter. I like to give a buffer, keeping the maximum viscosity <1,000 cSt on cold starts.

Hmm maybe I'm going to re-think my plan to run 10W-30 for the better Noack and better/fewer VIIs since I'll see 20F starts... Or even lower.

 

[RDY4WAR]

Hmm maybe I'm going to re-think my plan to run 10W-30 for the better Noack and better/fewer VIIs since I'll see 20F starts... Or even lower.

When it comes to API oils, a 5W-30 is usually the better option (even for Noack) due to how dirt cheap a 10W-30 can be made.

 

[tired]

When it comes to API oils, a 5W-30 is usually the better option (even for Noack) due to how dirt cheap a 10W-30 can be made.

I'm looking at a boutique. Amsoil or HPL.

 

[kschachn]

A synthetic 15W-40 would be my choice; they are very stout, and cold weather is not an issue.
Would love to see pics of this beast!!

The winter rating is the winter rating, regardless of base stock composition.

 

[PanteraMan74]

Not seeing what is the coldest ambient you’d run this car?

50°f

 

[4wd]

50°f

Ok, VR1 as is …

 

[PanteraMan74]

Ok, VR1 as is …

It’s a spring/summer car, and the coldest it would be when taking it to work is 45-50°f.