I recently had my '03 ES300 in for it's 10,000 mile maintenance. I noticed that the dealer adds BG oil additive as a part of this regularly scheduled oil change. I didn't get it because I asked for a by the book maintenance. I don't recall seeing it listed on the 5,000 mile schedule. I'm sure there is no harm, but after reading so much about oil gel I'm wondering if this is a preventive measure. The service advisor only said it helps to "clean the engine".
Is it a good practice or just a way for the dealer to get more $$? Any thoughts?