MTD 737-0209 Oil 5W-30 Bottle 2 Troy-Bilt 521 2100

What It Is

This is a 20-ounce bottle of MTD 737-0209 5W-30 engine oil, designed specifically for small engines in Troy-Bilt, MTD, and Craftsman lawn mowers. It’s a pre-measured, ready-to-use oil for routine changes or top-offs on 4-cycle mowers.

Fitment & Compatibility

• OEM part number: 737-0209 (MTD/Troy-Bilt). This is genuine OEM oil, not a universal aftermarket bottle.
• Brands: Direct fit for Troy-Bilt models (e.g., 521, 2100 series) and most MTD/Craftsman small engines with 4-cycle engines.
• Check before buying: Verify your mower’s engine requires 5W-30 viscosity (check owner’s manual or oil cap). This oil is not for 2-cycle engines or SAE 30-only engines. Also confirm your mower uses a standard 20-oz fill—some larger engines may need more than one bottle.
• Deck size irrelevant: This is engine oil, not blade or deck part. No deck measurement needed.

Key Things to Know

• Quality: Genuine OEM formulation, rated 5.0/5 by one reviewer. Meets small-engine specifications for gas mowers.
• Installation difficulty: Trivial—pour into oil fill tube. No special tools. Takes 2 minutes.
• Common gotchas: Only one review, so reliability data is thin. Price ($21.95) is higher than generic 5W-30 at auto stores (often $5–$10), but you’re paying for OEM confidence and convenience. Check bottle seal before use—leaks during shipping have been reported occasionally.
• Storage: Keep sealed in a cool, dry place. Shelf life is 2–3 years unopened.

Should You Buy It

Buy this if you want a guaranteed correct oil for your Troy-Bilt or MTD mower and value OEM peace of mind over saving a few bucks. It’s ideal for a quick, no-brainer oil change without measuring or guessing viscosity. If you’re on a tight budget or have multiple engines, a generic 5W-30 from an auto store works just as well for less.