Conventional Oil
Back in the day, conventional oil was the option most classic cars were originally designed to run on. It’s made by refining crude oil and then blending it into a usable engine lubricant, with additives mixed in to help with cleaning, anti-wear protection, and temperature stability. However, oil change intervals were relatively shorter. From a technical standpoint, conventional oil has a more irregular molecular structure than synthetic oil. That means it tends to shear down more quickly under high temperatures and heavy loads, which can reduce its ability to maintain a consistent protective film on engine parts. It also oxidizes faster, particularly in engines that aren't driven often.
Synthetic Oil
Synthetic oil is the more modern option. Instead of being directly refined from crude oil like conventional oil, it’s built at a molecular level. This means the molecules are more uniform in structure, which translates into more consistent performance inside the engine. Consequently, even under heavy loads or high RPMs, the oil film protecting engine parts tends to hold up better.
A lot of people assume synthetic oil is not good for older engines, but that myth dates back decades. Early synthetic oils in the 1970s contained chemical compounds that weren’t always compatible with the components in the era’s engines. In some cases, this led to seal shrinkage, which could cause leaks. However, that’s not the case with modern synthetic oils. Today’s formulations are extensively tested for seal compatibility and designed to work with nearly every material used in both modern and older engines. Moreover, synthetic oil performs much better in vehicles that are driven occasionally or stored for long periods, which are common scenarios for classic cars. It resists oxidation and doesn’t break down as quickly as conventional oil.
Book an Oil Change for Your Classic Car at Munro Motors
At Munro Motors, we work with classic and vintage vehicles every day, so we understand that these cars need a more thoughtful approach than just a standard oil change. Whether your engine is best suited for modern synthetic oil, traditional conventional oil, or something in between with the additives, we’ll help you sort it out! Give us a call at 1-866-868-9532, or visit us online to schedule your oil change service today.
