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Message: <blockquote data-quote="Tazza" data-source="post: 12701" data-attributes="member: 82">After this, i can see the whole "can of worms" starting <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" />Will be interesting to see if we can actually get the *rite* answer for all this.When you say engine oil is only made to withstand 200 psi or so, what difference is there between that and hydraulic oil? I just can't see any difference as they are both liquid so they can be compressed essentially indefinitely. I just don't understand how it all reacts at a molecular level. I guess it could cause it to start breaking down earlier. I have no signs of degradation of my RX super 15W40 that i run in my 743 after 2 years, i haven't put a lot of hours on it, but it has a few plus time and its as good as the day i filled it up. When the oil is still in the ground in the form of crude oil, its under a lot more than 5,000 PSI.I do like the idea of fire-resistant additives though.</blockquote>