Heating and Cooling› Thermostats, Housings and Fillers

PRESTONE

LIQUID COOLANT ADDITIVE C

$38.12

SKU: P03I HD300-16

Special Order
Special Order
Ships in 4–6 weeks
Free Shipping
Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Beginner — under 30 min

Description

The Prestone HD300-16 is an extended liquid coolant additive designed for heavy-duty cooling systems. It utilizes Extended Service Interval Technology to stop rust and scale buildup, while also protecting all engine and cooling system metals.

Fitment

Fitment Guaranteed

Don’t gamble
on fit.

Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

BrandPRESTONE
Part NumberP03I HD300-16

Buy with Confidence

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

View Full Return Policy