During summer months I usually use a straight 30wt in my 1993 186K 4.0 G.Cherokee Laredo. The other night I topped off after 2000 miles with almost a quart of 10w30. Something occured to me: I just added a quart of oil with VIIs to 5qts of straight 30wt. Question: Will the VIIs disperse into the 30wt and effectively convert it to a 40wt or higher at operating temperature? or are the VIIs permanently bonded to the 10w30 oil?