Not sure if you need a high mileage oil in your vehicle? You aren’t alone. If you searched the internet for “high mileage oil,” you would find more than 66 million results. You likely would see advertisements, price options, a few dozen brands to choose from and thousands of forum posts.
The problem is that there would be very little information on what makes oil “high mileage,” when it should be used or even what the differences are in the various brands and options. The goal of this article is to answer as many questions about high mileage oil as possible.
When to Use High Mileage Oil
High mileage oils contain additives and seal enhancers that reduce leaks (both internal and external). It’s possible that after an oil change or two, the leaking could stop. This has the potential to reduce oil spots in your driveway and on burning oil in older engines.
How do they work? High mileage oils contain seal conditioners and additives that cause o-rings, gaskets, and seals to swell. In some cases, older valve-guide seals in engines may have reduced seepage. This can result in lower oil consumption. Many high mileage motor oils include detergents and claim they are designed to remove sludge from engines.
Most high mileage oils are formulated to benefit vehicles with 75,000 miles or more. When to switch is ultimately your decision to make, but you should educate yourself to make the best determination. If you are experiencing blowby, loss of power, cylinder slap, strange noises, etc., you likely are having mechanical failures that should be addressed. These types of issues are not something a high mileage oil will fix.
On the other hand, if you have a high mileage vehicle that has been well maintained and are attempting to mitigate more engine wear with realistic expectations, a high mileage engine oil might be the right choice for you. Just don’t think that a high mileage oil will be a “silver bullet” for mechanical wear in your engine.
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