A Sandwich adapter permits the installation of an engine oil cooler without relocating the oil filter. It installs between the oil filter and the filter land on the engine block, providing a pressurized source of oil for the engine oil cooler. Flex-a-lite’s new proprietary design in light weight, matte finish with machined mating surfaces. Covers all major applications.

NOTE: A Sandwich adapter increases the distance the oil filter sticks out from the block. Check beforehand for adequate clearances. Shorter filters are made to fit most applications.

Part# Threads Thk O-Ring Application 3961 3/4”-16 1.5” 2-1/2” Most Audi, Ford & Ford Truck, Lincoln, Mercury, Dodge, BMW, Jeep, Lexus, non-metric Mazda, non-metric Nissan, Saab, all Saturn, all Range Rover, all Suzuki, Toyota, all Volkswagen, all Volvo. 3962 18mm x 1.5 1.5” 2-1/2” Most Buick L4 & V6, most Oldsmobile, some Pontiac, metric Cadillac, Chevy: all V6 and most 4cyl., some Isuzu, Jeep V6, metric AMC, Saab V6 3963 13/16”-16 2” 3-1/8” Chevy V8s with recessed spin on filter. (Not offered with pressure relief valve; these engines have built-in pressure relief valves.) 3964 13/16”-16 1.5” 3-1/8” Many early 4 & 6cyl. Chevy, some 4, 6 & 8cyl. Buick, Pontiac & Oldsmobile. 3965 20mm x 1.5 1.5” 2-1/2” Most Acura, some metric Chevy, some metric Ford, metric versions of Chrysler, Dodge, Mazda, Nissan, Plymouth & Pontiac, Porsche, Subaru, most Honda, most Isuzu, some Jeep, some Mercury, Mitsubishi. 3966 13/16”-16 1.5” 2-1/2” Non-metric versions of the following: AMC, Cadillac, 2.4 L Chevy, Jeep L6 & V8 1965 thru 1986, Buick, Oldsmobile, Pontiac. 3967 22mm x 1.5 1.5” 2-1/2” Some Acura, some metric Chevy, some Ford V6, V8 & V10, Honda Civic & CRX, some metric Lincoln/Mercury V6 & V8.