Conventional oil, while cheaper than synthetic, is less refined and can lead to more engine sludge and gunk build-up down the road. Synthetic oil , on the other hand, is slightly more expensive but contains fewer impurities and can, therefore, keep your engine cleaner and lubricated for longer.
Pennzoil synthetic oil is actually even purer, as it is not made from crude oil. It is the first motor oil made from natural gas. Learn more about Pennzoil ingredients in this video. Keep in mind that mixing synthetic and conventional oil dilutes the beneficial effects of higher quality synthetic oil. Not only does this devalue your synthetic oil investment, but it may also lead to you needing an oil change earlier than expected.
Also, consider that even though motor oils contain the same essential ingredients, they each have different additives, chemical properties, and detergents. Mixing different types can destabilize your motor oil, reducing its efficiency and affecting your engine's performance. The smartest choice is to stick with the oil type and oil change intervals recommended by your car's manufacturer and visit your local car care experts for affordable services.
It's important to keep oil at safe and clean levels to avoid engine trouble. Many people do this by topping off their motor oil in-between oil changes. This is often how motor oil types get mixed. While the occasional oil top-off is usually okay, getting an oil change is always the best way to keep your engine running smoothly.
If you must top-off your oil, try to use the same type that's already in your vehicle to avoid losing any of its benefits.
There's a lot of nonsense floating around about when to change your synthetic oil. If your vehicle runs synthetics—and most do these days—the best place to find the correct oil-change interval is the owner's manual. Manufacturers' recommended synthetic-oil change intervals vary greatly.
For the vehicles in Car and Driver' s long-term test fleet , those intervals range from to 16, miles and almost always include oil-filter changes.
Most modern vehicles have change intervals in the to,mile range—generally a good schedule to use if you absolutely cannot find any information on the oil-change interval for your vehicle. Manufacturers also have a special set of recommended synthetic oil-change intervals for vehicles driven in severe conditions like Mojave Desert heat or Alaskan cold—or for vehicles that spend most of their time on dusty roads.
Many newer vehicles have oil-quality monitoring systems that keep track of driving conditions—the length of your trips, engine temperatures, and other engine parameters. The algorithms in those systems calculate when your oil should be changed and alert you when it's time. If your vehicle is older, you might want to consider one of the synthetics billed as "high mileage" oil. These oils do have a different combination of additives that might be a little better suited to engines with a lot of wear, tear, and miles on them.
There's no hard-and-fast rule that you should put them into your car's crankcase, however. Most important is to use a synthetic with the same SAE viscosity named for the engineering organization SAE International that the factory filled your car with in the first place, and to follow the correct oil-change interval.
Doing that will help your car run properly and your engine last longer. New Cars. How to Lubricate Doors. How to Lubricate a Driveshaft. Experienced Mechanic? Recent Oil Change reviews. Excellent Rating. Rating Summary. James 25 years of experience. Request James.
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