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Fredric Riech is an Independent AMSOIL Dealer in Wasilla, AK. Orders go through https://www.amsoil.com/?zo=1245102.

Synthetics

Three synthetics

Choose the drain. Then the bottle.

All three are 100% synthetic, and all three meet the spec on the cap. The difference is how long AMSOIL says you can leave them in. A longer drain also means less waste oil and fewer quarts bought in a year.

  • AMSOIL Signature Series 5W-30 quart bottle

    Up to 25,000 miles or 1 year

    Signature Series

    The top tier. One oil change a year for normal gasoline service, with the wear reserve and the cold-flow the flagship is built for. Severe service, including Alaska short trips, is 15,000 miles or one year.

    Shop Signature Series
  • AMSOIL XL 5W-30 quart bottle

    Up to 20,000 miles or one year in normal service

    XL

    The middle tier. A longer drain than the owner’s manual for drivers who want a real synthetic, without paying for the 25,000-mile reserve. Severe service is shorter; see the note below.

    Shop XL
  • AMSOIL OE 5W-30 quart bottle

    The owner’s-manual interval

    OE

    100% synthetic at the factory interval. The right bottle for a lease, a warranty file you want to keep simple, or anyone who already changes oil when the manual says to.

    Shop OE

XL severe service: AMSOIL lists up to 12,000 miles or one year, whichever comes first, for commercial or fleet vehicles; excessive idling; or frequent towing, hauling, plowing or driving in dusty conditions. With non-AMSOIL oil filters, AMSOIL says not to exceed 12,000 miles or one year unless your vehicle manufacturer recommends longer. Many owner’s manuals also count frequent short trips and extreme cold as severe service, which covers a lot of Alaska driving. Follow AMSOIL’s severe-service recommendation or your manufacturer’s interval. Source: AMSOIL Extended-Life (XL) data bulletin G1404 (7/26).

Diesels use Max-Duty, not these gasoline tiers. Motorcycles use metric or V-twin oil. The diesel page and the vehicle lookup are the tie-breakers.