Size to the largest sump before you empty
Buying guides often show product photos without mapping your sump quarts and planned drains to tank liters with freeboard. OilExtract starts from manual capacity, then applies drains and freeboard.
Why this ladder is only 6.5 and 15 L
Verified VEVOR US vacuum extractor listings checked 2026-09-10 sit at 6.5 L (1.74 gal) manual and 15 L (4 gal) pneumatic/manual. Other mid sizes exist but are outside this site’s verified ladder. This is separate from under-car drain pans.
What SERP guides miss
Most pages compare brands or explain dipstick extraction without an interactive map from quarts × drains ÷ freeboard to a purchase class with an explicit NO_MATCH path.
Safety rules this screen never relaxes
Dispose waste oil legally. Confirm tube fit and fluid temperature limits on the listing. Do not extract gasoline or other highly flammable solvents with this consumer vacuum class. Ratings are manufacturer claims — verify the listing. Affiliate tracking is pending.
Class ladder on this site
Required tank L ≈ (quarts × 0.946353 × drains) ÷ fill. Fill 0.85 for 15% freeboard or 0.75 for 25%. 6.5 L class if required ≤ 6.5; 15 L if required ≤ 15; else NO_MATCH. Specs checked 2026-09-10 on the linked product pages.