CITGO Petroleum CorporationHydrocarbon Solvents

CITGO Lemont Refinery

135th

Street and New AvenueLemont, IL 60439

April 17, 2018

Dear Customer:

CITGO Petroleum Corporation is increasing off-list prices on Aliphatic Solvent products.

Effective April 28, 2018 the price of the following products will increase three cents per pound:

Rubber Solvent Lactol Spirits 2300

Camping Fuel Mineral Spirits 75

Textile Spirits Mineral Spirits 66/3

Hexane 142 Solvent 66/3

Heptane CITGO Solvent 500

Special Lactolite Mineral Spirits 150 66/3

Special Naphtholite 66/3 (VM&P) Nonexempt Mineral SpiritsNaphthol Spirits 66/3 All blends containing these productsMineral Seal Oil

This price change is in response to current market conditions and higher energy values.

Fulfillment of orders prior to this increase will be dependent upon product and transportation

equipment availability.

Please contact your CITGO Account Manager if any questions.

Sincerely,

Nicole Rohrabaugh

Manager, Hydrocarbon Solvents