There is a considerable amount of information in this thread: http://www.stromtrooper.com/maintenance-tech-farkles/30068-big-oil-thread.htmlOld post but thought it would be good for other noobs like me to see.
I have to dump the winter oil, but I have a long trip planned and know I won't put enough miles on this oil before I have to dump it again for the trip. So I want to use cheaper oil this time around.
But Shell sells their Rotella T5 synthetic blend oil, Quaker State Enhanced Durability blend oil, and Pennzoil Gold syn blend.....My brother in law is a lubricant specialist at Shell Canada. His recommendation is not to mix synthetic and conventional.