def38
Platinum Member
the only time you don't want to use synthetics are during the engine break-in period. synthetics reduce wear so much that it would take a lot longer to break-in the engine.
Many new car manufacturers factory fill their new engines with synthetic engine oil. Modern engines require little if any break in these days. Tires, brakes and other wear components are more in need of a break in period than the engine. Some new car owners change the oil at early intervals in order to catch and discard engine metals that come off parts during early miles. Oil filters catch and trap these metals, grit, dirt and wear particles that are supposedly contaminating engine oil at early miles. Finally, some add special high zoot engine oil additives to improve engine performance and reduce wear at the early miles...all unnecessary. Modern engine oils do everything necessary to protect the engine from the first start. Follow the engine manufacturer's recommendations. More info available at BITOG. Look at the UOAs where particle counts are included in the analysis results.