CSS Validation importance in search engine ranking

Has there been any change in the way CSS Validation is valued by the major
search engines? If so, is there any particular one that regards the
validation as relatively important yet? I have been very carful with my
websites: www.rustdepot.com <http://www.rustdepot.com/>
www.rustwarehouse.com <http://www.rustwarehouse.com/>
www.rustremoverproducts.com <http://www.rustremoverproducts.com/>  and now
www.rustremoverstore.com <http://www.rustremoverstore.com/>  to ensure that
they all pass validation, however; I see many competitors' websites
absolutely filled with errors and warnings, yet they typically rank very
high. I know there are many other factors, I am still wondering how
validation factors in to rank. For me the tool is extremely important even
for my own peace of mind knowing that at least it is optimized in the code
structure. Keep up the good work! Thank you in advance, Lee