Your oil filter is the last line of defense before contaminants get into the heart of your vehicle. Those contaminants can lower your engine's performance and cause costly damage. All moving parts in an engine need clean oil to function. A premium filter maintains the quality of the oil circulating in the lubrication system, keeping your engine running efficiently for a lot longer. The Royal Purple Extended Life Oil Filter 20-51A with silicone anti-drain back valves uses 100% synthetic micro-glass filtration media supported by steel mesh backing for superior particle removal. The quality of an oil filter is stated as a percentage of particles caught at a certain size or larger. Royal Purple boasts 99% filtration efficiency at 25 microns or larger, and 80% at 10 microns. We don't believe in messing with perfection, so we only produce one type of oil filter with variations for different motor vehicles.
Royal Purple Extended Life Engine Oil Filter 20-51A:
OE replacement engine oil filter
20,000 mile protection
99% filtration
Anti-drain back valve to prevent dry starts
Equivalent of:
Mobil 1 M1C-201A
FRAM XG3980
K&N HP-2001
AC Delco PF52E
Vehicle Application:
1980 - 1996 Buick
1982 - 2000 Cadillac
1981 - 1982 Checker Cab
1980 - 2004 Chevrolet
1981 - 2005 GMC
1995 - 1996 Hummer
1999 - 2000 Isuzu Hombre
1980 - 2001 Oldsmobile
1980 - 1996 Pontiac
Not all engine oil filters have an anti-drain back valve, but all Royal Purple Extended Life Automotive Spin-On Oil Filters do. The purpose of an anti-drain back valve is to avoid dry starts that can really grind on your engine. Anti-drain back valves prevent oil drain back when you shut off the vehicle, leaving just enough behind for startup. Our valve is built to last, constructed from durable silicone that outlasts standard rubber in both extreme hot and cold temperatures. The shell of our filter is heavier for extra strength and security from road debris puncture. Heavy-duty nitrile rubber base gasket and metal end caps provide a positive seal and prevent leaks.

When To Change Your Oil Filter:

Changing your oil yourself shouldn't take very long and can save you some money. The question we get most often is: when do oil filters need to be changed? If your car is still under warranty, follow the manufacturer's recommended change interval. If not, the filter and the oil go hand in hand. When the oil goes, the filter goes. Dirty or clogged oil filters can allow contaminants to pass through or block the flow of oil to your engine. It's not recommended to change our oil filter without changing the oil. You can install your oil filter using the instructions on the filter, using a filter wrench as needed. Royal Purple is compatible with all synthetic and conventional oils.

About Royal Purple Filters:

Royal Purple Engine Oil Filters are premium filters compatible with all synthetic and conventional oils. At Royal Purple, we focus exclusively on developing state-of-the-art lubricants to out-perform other oil brands. That includes best-in-class fuel system cleaners, synthetic gear oil, oil filters, and more to help you get peak performance out of your engine. Make your car, boat, motorcycle, snowmobile, or other motorized gear more reliable, and protect their longevity with the best lubricants, engine fluids, and oil filters.