Site Traffic Information and Cookies

We use cookies (and equivalent technologies) to collect and analyse information on our site's performance and to enable the site to function. Cookies also allow us and third parties to tailor the ads you see when you visit our site and other third party websites in the same online network, including social networks. By clicking 'Agree', you agree to these uses of cookies. If you do not agree or if you would like more information, you can manage your cookie preferences by clicking the link provided.

Manage cookie preferences

Skip to main content
  1. Home
  2. Products
  3. Automotive
  4. Car engine oil formulation
  5. Monograde oil

Monograde oil

While multigrade engine oils always make sense in colder climates, several US states are so warm that your vehicle may be better with one of our monograde oils.

Monograde engine oils

Why might you need a monograde motor oil? Generally when you live in a warm climate. Multigrades are designed to flow easily when cold, but become more viscous when they're warm.

 

But if you live somewhere with high ambient temperatures, your car or light truck needs a monograde motor oil that is liquid engineered to protect from the moment the engine starts, resist thermal breakdown and keep delivering protection in even the hottest operating conditions.

The benefits of Castrol® HD 30 AND HD 40:

  • Exceed API SM, SL and SJ performance for passenger cars and light trucks
  • Provide maximum wear protection in warm climates
  • Use HD 30 where ambient temperature is above 40 degrees F
  • Use HD 40 when ambient temperature is above 60 degrees F
Product Data Sheet
Material Safety Data Sheet