Mixing Viscosities

[XTrooper]

Hi, Bob. I, like many others, have been plagued by oil consumption problems due to the oil getting into the intake via the PCV valve/system. I know that some of the Mobil 1 racing teams mix viscosities in their racing engines so with this last oil change I gave this practice a try myself. I am now running in my 'Vette a mixture consisting of 4 quarts of Mobil 1 10W30 and 2.5 quarts of Mobil 1 15W50 and, so far, it seems to have cured the problem.
Now I drive my car pretty hard, it's kept in a heated garage, and it's rarely driven in the winter and then only after being thoroughly "warmed up." With these facts in mind (and other than the few horses I understand I'm probably losing due to its higher overall viscosity), do you see any detriment to my using this mixture?

Thanks for your time! :cool:

[Robert Pache]

Other than a slight loss in fuel efficiency or power, there is no problem in mixing the 10W-30 with 15W-50. You probably end up with an oil around 10W-40. However, since GM does not reccomend the use of 15W-50, it could cause some warranty concerns.

Bob

[XTrooper]

Thanks, Bob! I was looking for a green light on this and you've given it to me! :cheers:

As far as the warranty is concerned, my views on that can be summed up by the question, "You mean these cars come with a warranty?!" :LOL:

If you take a look at my mod list, you'll see that I left my warranty behind long ago. :cool:

Thanks again!

Steve