PLEASE NOTE - Some products are not immediately available. If your order will be delayed, we will e-mail you or call you and let you know.
E-MAIL US HERE about availability and we will respond quickly! We ship same day if your order was placed by 1:00 PM EST during normal business hours BASED ON AVAILABILITY.
NEXT DAY SHIPPING NOTE - Please see our Shipping Policy SATURDAY OR SUNDAY DELIVERY IS NOT AN OPTION.

WE ARE CLOSED ON MONDAY, MAY 27th IN OBSERVANCE OF MEMORIAL DAY AND WILL RESUME NORMAL BUSINESS HOURS ON TUESDAY, MAY 28th
ALL ORDERS PLACED THIS WEEKEND AND ON MONDAY WILL BE PROCESSED ON TUESDAY, MAY 28th
THANK YOU TO ALL OUR ACTIVE AND RETIRED SERVICE MEN AND WOMEN FOR YOUR CONTINUED SACRIFICE TO KEEP THIS COUNTRY SAFE AND FREE. MAY GOD BLESS YOU ALL!
PLEASE HAVE A SAFE MEMORIAL DAY WEEKEND FROM ALL OF US AT MY INBOARD MARINE!

Oil - Engine - Catalyst Marine Engine Oil 25W-40 Five Quart Jug 18-9400CAT-4

$52.87 $57.69

Sierra's Premium Blend 25W-40 catalyst engine oil is specially formulated to meet the needs of 4-stroke marine engines with catalyst emission systems. Sierra premium blend catalyst compatible inboard engine oil...

Sierra's Premium Blend 25W-40 catalyst engine oil is specially formulated to meet the needs of 4-stroke marine engines with catalyst emission systems.

  • Sierra premium blend catalyst compatible inboard engine oil
  • SAE 25W-40
  • 5 quart jug
  • Recommended for use with inboard and I/O marine engines with catalyst exhaust systems
  • Meets the requirements of modern 4-stroke recreational engines with or without emission catalyst systems
  • Developed specifically for the marine environment and the high running stresses marine engines encounter
  • Protects internal engine components from rust, corrosion, and from sticking piston rings
  • Premium blend features high detergency, anti-oxidants, and antiwear proprties
  • ZDDP anti-wear additive prevents phosphorus depletion and extends the emission catalyst life
  • Exceeds all 4-stroke requirements including FC-W and FC-W Cat compatible
  • NMMA FC-W certified
  • Replaces Bel-Ray 99730-BT4