Oxidation means inflamation?
Oxidation does not mean inflammation. But oxidation can be a cause of inflammation.

Oxidation processes are part of normal cell metabolism (mostly in mithocondria). They lead to reactive oxygen species ($O_2^-$, $H_2O_2$ and $OH-$) which can trigger inflammation via activation of some transcription factors:


  NF-κB, AP-1, p53, HIF-1α, PPAR-γ, β-catenin/Wnt, and Nrf2 [1]


The metabolic processes also produce some  antioxidants to inactivate those reactive oxygen species. But the excess of oxidants leads to oxidative stress which seem to be linked with inflammation and even to cancer [1].


  rapeseed oil is less saturated and therefore more likely to oxidize


Being "less saturated" I guess it would be better, as studies have found that saturated fatty acid promote inflammation [2], while unsaturated fats decrease the production of inflammatory cytokines and reactive oxygen species [3].


  So my question is this: is it really possible to safely say: "oxidation = inflammation"?


NO. By definition, oxidation is a chemical reaction in which a molecule, atom or ion loses electrons [4]. On the other hand, inflammation is a very complex process, a biological response to harmful stimuli and requires cellular interaction [5].



References:


Reuter S, Gupta SC, Chaturvedi MM, Aggarwal BB. Oxidative stress, inflammation, and cancer: how are they linked? Free Radic. Biol. Med. 2010 Dec 1;49(11):1603-16. doi: 10.1016/j.freeradbiomed.2010.09.006. PubMed PMID: 20840865. 
Saturated Fatty Acids and Inflammation: Who Pays the Toll?
Alan Chait and Francis Kim
Arterioscler Thromb Vasc Biol. 2010;30:692-693, doi:10.1161/ATVBAHA.110.203984
Supplement: n–3 Fatty Acids: Recommendations for Therapeutics and Prevention:
Philip C Calder
n−3 Polyunsaturated fatty acids, inflammation, and inflammatory diseases
Am J Clin Nutr June 2006 83: 6 S1505-1519S
Wikipedia contributors, "Redox," Wikipedia, The Free Encyclopedia, http://en.wikipedia.org/w/index.php?title=Redox&amp;oldid=621442954 (accessed September 13, 2014).
Wikipedia contributors, "Inflammation," Wikipedia, The Free Encyclopedia, http://en.wikipedia.org/w/index.php?title=Inflammation&amp;oldid=625272396 (accessed September 13, 2014).