mixing Chev. 10/30 & 10/40...opinions, please

Messages
9,283
Location
Fayetteville, NC
Sorry if this type of questions has been asked before, but this is a little specific, so bear with me, please.(I already did a search) To compensate for the little oil leak/burning I have, and to deal with the fact that even in winter a motor reaches high temps after a while of driving, I'm thinking mixing 3 qts of Chevron 10/30 & 2 qts of 10/40 dino oil for my next oil change. ** is there any danger of clashing additive packages, incompatibilities as a result of this? ** would a 4:1 ratio be safer than the planned 3:2 ratio? ** I'll also be using the 12 oz. Auto Rx with this mix.** the motor is a 1997 4.6L Ford sohc w/88,000 miles ** assuming a lowest temp here to be around 30 F in winter Any danger-points? Thanks in advance...
 
Messages
5,069
Location
Saratoga, NY
No danger at all ... but I don't think you'll see any benefit, either. The 10W40 is not very shear stable and will be down to a 30 weight in about 2,500-3,000 miles in many applications. Maybe it's just 10W30 with a little bit of viscosity index improver added? [Confused] I don't think this will help with any leaking/burning problem you have. [Frown] If you do a search in the used oil analysis section, you might find the results (from about 2 months ago) from someone who used a Chevron "soup" in their engine. [I dont know] --- Bror Jace
 
Messages
453
Location
Galveston, TX
quote:
Originally posted by 97tbird: Sorry if this type of questions has been asked before, but this is a little specific, so bear with me, please.(I already did a search) To compensate for the little oil leak/burning I have, and to deal with the fact that even in winter a motor reaches high temps...... ......Any danger-points? Thanks in advance...
If you want to "Brew your own Chevron," why not use 50/50 mix of Chevron 10w-30 and 20w-50? With a mix of these two, you will wind up with something approximating a 40 weight. Best part of it is, the two mentioned have low Viscosity Index improver polymers, so your "special blend" will stay approximately a 40 weight for some time. Unlike the 10w-40, which cannot even stay a 40-weight for 1,000 miles. Hopeless! [Embarrassed]
 
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