Synthetic vs. conventional oil: which do you actually need? Here's the cost-per-mile math, a 5-question decision tree, and the honest answer for your engine.
Valvoline Advanced runs about three bucks less than Mobil 1 per 5-quart jug. Both are API SP. Where the difference actually shows up — and where it doesn't.
Both promise 15,000-mile drain intervals. The chemistry, the warranty, and the BITOG used-oil data — what actually holds up across the long haul.
How long does synthetic oil last? 7,500–10,000 miles in normal driving, up to 15,000 for extended-drain formulas — but time runs independently of mileage.
How often should you change your motor oil? The answer is in your owner's manual — not on that 3,000-mile windshield sticker.
The 3,000-mile oil change myth costs drivers money without protecting their engines. Here's what the real interval is — and why the sticker lies.