I'm okay with that. Per Wikipedia:Redirect#What needs to be done on pages that are targets of redirects, it should be mentioned in the lead and bolded. There is also the Wikipedia:Article titles#Treatment of alternative names policy for synonyms (although not all synonyms are mentioned in the lead, either because they are one of several or many and should rather be covered lower in the article or because they are offensive and/or unencyclopedic; while there is Wikipedia:NOTCENSORED and it is a policy, it can be trumped by the Wikipedia:Offensive material guideline, seeing as even Wikipedia:NOTCENSORED mentions that offensive material shouldn't be included just for the sake of including it). Anyway, yep, there is no problem with your proposal for the engine coolant text. 134.255.247.88