Mixing 20w50 with 5w30

[Greg L]

Is it ok to add a little 20w50 to existing five quarts of 5w30 in the sump?

My oil pressure was a little low in Dodge 4.7....so I added 1/2 quart of Valvoline Maxlife 20w50 (then added the other half to Gmc 5.7).

GL


P.s. pressure is slighty up now

 

[donnyj08]

all is well i'm sure.

 

[simple_gifts]

yes; i just did a 1000 mile blast to western VA and back running 20w-50 the whole way....

 

[CT8]

Fine.

 

[HTSS_TR]

Originally Posted By: Greg L
Is it ok to add a little 20w50 to existing five quarts of 5w30 in the sump?

My oil pressure was a little low in Dodge 4.7....so I added 1/2 quart of Valvoline Maxlife 20w50 (then added the other half to GMC 5.7).

GL

P.s. pressure is slightly up now

You added 1/2 quart 20W50 to raise oil pressure even the oil level was full on dipstick ? Or you added half quart because the oil level was half way between add-line and full ?

 

[CourierDriver]

Mixing and such never blew an engine in my rides, usually I add a quart over, do not panic....

 

[CATERHAM]

Yes it's okay although it's certainly not the best way to thicken up a 5W-30 due to it's very low VI.
Probably the best and most cost effective way to increase the viscosity of a 5W-30 is to blend in some M1 0W-40. This way you're maximizing the increase in viscosity at operating temp's while minimizing the viscosity increase on start-up. A 20W-50 does the exact opposite.