sle2115
NRA LIFE MEMBER
While not in diesel engines, I prolly have 8 or 900,000 miles on synthetic. On a new vehicle, I like to get at least 5,000 on them or so to allow for break in.
I made my choice when working on state patrol vehicles in the machine shop, where they did 100,000 overhaul intervals. We saw engines with 3 or 400,000 miles on them with next to no wear and VERY clean internals. The overhauls were not needed, but required as was the use of synthetic oils by the department. To be honest, I have seen them that ran Mobil 1, Syntec, Amsoil, Quaker State, or a mix of them all, etc., just depended on the drivers choice as they are required to maintain their vehicle. Engines had very few deposits and as I said, no wear. We never bored an engine or turned a crank that I can remember, and I was the one who did the work on them, they were pretty much under my control from the time the entered the shop till they left. We generally could do a hone on the cylinders, polish the crank, valvejob (which was hardly ever required), clean the surfaces and bolt it back together! We did see a few diesel engines on synthetic though and they were pretty much consistant with the gassers.
I made my choice when working on state patrol vehicles in the machine shop, where they did 100,000 overhaul intervals. We saw engines with 3 or 400,000 miles on them with next to no wear and VERY clean internals. The overhauls were not needed, but required as was the use of synthetic oils by the department. To be honest, I have seen them that ran Mobil 1, Syntec, Amsoil, Quaker State, or a mix of them all, etc., just depended on the drivers choice as they are required to maintain their vehicle. Engines had very few deposits and as I said, no wear. We never bored an engine or turned a crank that I can remember, and I was the one who did the work on them, they were pretty much under my control from the time the entered the shop till they left. We generally could do a hone on the cylinders, polish the crank, valvejob (which was hardly ever required), clean the surfaces and bolt it back together! We did see a few diesel engines on synthetic though and they were pretty much consistant with the gassers.