Understanding the Fundamental Differences Conventional motor oil is refined from crude oil, resulting in a product that contains a complex mixture of hydrocarbons, impurities, and varying molecular sizes. In these rare cases, using a conventional oil to fill a synthetic system is generally safer than running the engine low on lubricant.
Manufacturer Specifications on Mixing Different Oil Types
Mixing oils with different viscosity ratings, such as a 5W-30 synthetic with a 10W-40 conventional, can create an unpredictable final product. Many warranties require the use of specific oil types and viscosities; using a different blend than recommended could be grounds for denying a claim related to engine failure.
Understanding the implications helps you make informed decisions that protect your engine and warranty. This means you will lose the extended drain intervals that are a primary reason for using synthetic oil in the first place.
Manufacturer Guidelines on Mixing Different Oil Types and Viscosities
This base stock is then enhanced with detergent and dispersant additives to help control heat and deposits. Using the correct oil weight is more important than the brand or marketing claims.
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