Hughes Oil Company, Inc. Was in the petroleum industry from 1961 until 2004. We carried every brand and type of petroleum to even non-petroleum food industry lubricants. We still have a hand in the petroleum industry although we retired the company due to children and grand children too damned lazy to work for a living. lol
Point being, there is no engine created by man that requires a full synthetic lubricant. It is a good joke originally played on the British and US public that has made so much money it has carried around the entire globe.
Without going into chapter after chapter of stating and then showing why, I'll give you a one word reply just like some others.
"No".
There is nothing your engine requires to live a long comfortable life than a non ash oil such as the Shell Rotella T 15-40 which engines over 12,000 horsepower operate on daily in locomotives, huge earth moving equipment, etc. Fuel cooled engines do not place the strains on engine oils the aforementioned can and does. Only thing you'll need to be concerned with is unspent fuel contaminating your engine lubricants since fuel as well as air cools your engine.
Sorry fellas, synthetics are made to sell to ***** and you can make up your own jokes on those 5 asterics. lol
Max