Which is better for a high-mileage engine?

Extended Performance High Mileage. Its seal conditioners target leaks and oil burn common in older engines, and it costs $35.97 at Amazon versus $45.99 for Advanced Clean as of November 6, 2026.

Which cleans a sludged engine better?

Advanced Clean. It is the cleaning-focused formula, and Mobil 1 cites Sequence VH rocker cover sludge results for it. Extended Performance High Mileage still reduces deposits and sludge.

Is the 25,000-mile interval realistic?

Mobil 1 rates Extended Performance High Mileage for up to 25,000 miles or 1 year, whichever comes first. Follow your owner's manual if it specifies a shorter interval, and check the oil level regularly.

Is Advanced Clean worth $10 more?

Only if cleaning is your priority. Both meet ILSAC GF-7 and both are 0W-20 full synthetic, but Extended Performance High Mileage lasts 5,000 miles longer per change and costs less.

Can I switch between them?

Yes. Both are 0W-20 full synthetic meeting ILSAC GF-7, so they mix and swap safely. Pick one based on engine age and cleaning needs.

Do both come in the same size?

Yes. Both are a single 5-quart jug of 0W-20, enough for most four-cylinder and many V6 engines.

Mobil 1 Extended Performance High Mileage 0W-20 vs Mobil 1 Advanced Clean 0W-20 Motor Oil

Buy the Mobil 1 Extended Performance High Mileage for older or high-mileage engines and for the longer 25,000-mile drain interval. Buy the Advanced Clean if you want Mobil 1's strongest sludge-cleaning formula for a newer or sludged engine. On November 6, 2026, Extended Performance High Mileage is $35.97 at Amazon, while Advanced Clean is $45.99 at Amazon — $10.02 more for the shorter interval.

Today the Mobil 1 Extended Performance High Mileage 0W-20 costs $10.02 less at its best price.

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