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Lowest Price GuaranteeSpark Plug1946-1961 Ford Prefect; 1951-1965 Mercedes-Benz 220Sb/220b; 1951-1966 Mercedes-Benz 220; 1951-1960 Mercedes-Benz 219; 1953-1957 Austin Healey 100 Sold Individually
ACDelco R42XLS Spark Plug is designed as an application-specific service replacement that supports proper fit, function, and system integration. Delivers the ignition spark required to initiate combustion in the engine cylinder. Verify vehicle fitment and system configuration before installation.
ACDelco R42XLS Features:
- Application-specific heat range, reach, and terminal configuration should be matched to the specified vehicle application
- Application-specific replacement spark plug for compatible engines
ACDelco R42XLS Fitment:
- 1946-1961 Ford Prefect
- 1951-1965 Mercedes-Benz 220Sb/220b
- 1951-1966 Mercedes-Benz 220
- 1951-1960 Mercedes-Benz 219
- 1953-1957 Austin Healey 100
- 1954-1958 Alfa Romeo Giulietta
- 1954-1966 Mercedes-Benz 220S
- 1954-1957 Mercedes-Benz 220a
- 1954-1963 Mercedes-Benz 300SL
- 1954 MG TF
- 1956-1961 Ford Escort
- 1956-1957 Mercedes-Benz 300SC
- 1957-1961 Maserati 3500GT
- 1957-1968 Lancia Flaminia
- 1958-1970 Austin Healey Sprite
- 1958-1966 Mercedes-Benz 220SE
- 1958-1959 Mercedes-Benz 300D
- 1960 Austin Mini/Mini 850
- 1960-1964 Mercedes-Benz 190C
- 1961-1969 Austin Mini Cooper & Nissan Patrol
- 1961-1968 Amphicar 770
- 1961-1962 Mercedes-Benz 300/300D
- 1961-1966 Mercedes-Benz 300SE
- 1962 Alfa Romeo Giulia Sprint
- 1962-1968 Alfa Romeo 2600 & Simca 1000
- 1962-1963 Alfa Romeo Giulia/Giulietta
- 1962-1964 Ford Capri & Maserati 3500GTI
- 1962-1981 MG MGB
- 1962-1965 Nissan 1500
- 1962-1966 Maserati Sebring
- 1962-1975 Lotus Elan/Seven
- 1962-1969 Lancia Flavia
- 1963-1973 Mercedes-Benz 300SEL & Rover 2000
- 1963-1974 Lancia Fulvia & Morgan Plus Four & Morris Minor
- 1963 Mercedes-Benz 190SL & Renault Caravelle
- 1963-1970 Maserati Mistral/Quattroporte & Peugeot 404
- 1963-1967 Austin Mini 850 & Mercedes-Benz 230SL
- 1963-1968 Lotus Super Seven & Simca 1000S
- 1963-1966 Austin Mini & Glas 1204/1304/1700 GT/2600
- 1964 Alfa Romeo GTC/GTZ
- 1964-1967 Lamborghini 350GT & NSU Prinz
- 1964-1966 Austin Mini Moke & Elva Courier & Glas 1300 GT/1700
- 1964-1972 Mercedes-Benz 600
- 1965 Alfa Romeo GTV & BMW 2000c
- 1965-1966 BMW 2000cs
- 1965-1967 Fiat 600D & Humber Imperial/Super Snipe & Sunbeam Imp
- 1965-1970 Ford Cortina & Sunbeam Rapier
- 1965-1969 Sunbeam Alpine
- 1966 Alfa Romeo Duetto 1600/Giulia/Giulia Sprint
- 1966-1968 Lamborghini 400GT & Mercedes-Benz 200/250S/250SE/250SEC/250SL
- 1966-1973 Lamborghini Miura & Maserati Mexico
- 1966-1967 Alvis TF21
- 1966-1969 Abarth Simca & Fiat 124 & Mercedes-Benz 230/230S
- 1967-1968 Glas 1600 GT/3000 GT & Morgan 4/4 Series V
- 1967 Nissan 411 & Triumph 2000/GT6
- 1967-1969 Abarth 1000/1300/2000 & Ferrari Dino 206 GT & Matra 530 LX/530 SX & Triumph TR250
- 1967-1974 MG Midget & Reliant Scimitar
- 1967-1973 Fiat 850 & Maserati Ghibli
- 1967-1970 Mazda 1500 & Sunbeam Arrow
- 1967-1975 Lotus Europa
- 1968-1974 BMW 2800 & Morgan 46116/Plus 8
- 1968-1976 Triumph TR6
- 1968-1971 BMW 2500/2800CS & Jaguar XJ & Mercedes-Benz 280S/280SL
- 1968 Opel Kadett/Rallye
- 1968-1970 Lamborghini Islero & Siata Spring
- 1968-1978 Lamborghini Espada
- 1968-1972 Austin America & NSU 1000/110/1200C/Sport Bertone/TT
- 1968-1973 Mercedes-Benz 220/250/280SE/280SEL
- 1968-1969 MG 1300/MGC
- 1969-1974 Alfa Romeo Berlina/GT Veloce/Spider & Lancia 2000 & Maserati Indy
- 1969-1978 Peugeot 504
- 1969-1971 Simca 1118/1204
- 1969-1972 Audi Super 90 & Honda 600
- 1969-1973 Ferrari Dino 246 GT & Mercedes-Benz 250C
- 1969-1970 Saab 96
- 1969 Saab Sonett
- 1969-1977 Audi 100 Series
- 1970-1972 Marcos GT & Mazda 1200/616 & Mercury Capri & Subaru Star
- 1970-1974 Porsche 914
- 1970-1976 Lamborghini Jarama
- 1970-1973 Nissan 240Z
- 1970-1971 Mazda 1800
- 1971-1975 Alfa Romeo Montreal
- 1971-1972 Ford Pinto & Peugeot 304 & Saab 99
- 1971 BMW 2.8 Bavaria/3.0CSL/3.0Si
- 1971-1974 BMW 3.0CS/3.0CSi/3.0S
- 1971-1992 Dodge Colt
- 1971-1973 Plymouth Cricket
- 1971-1979 Fiat 128
- 1971-1983 Maserati Bora
- 1972-1973 Ferrari Dino 246 GTS & Mazda 618 & Mercedes-Benz 350SL & Subaru Deluxe & Volkswagen 411
- 1972-1975 Subaru GL
- 1972-1974 BMW Bavaria
- 1972-1982 Maserati Merak
- 1972-1977 Mazda 808
- 1972-1976 Jensen Healey & Mazda B1600
- 1973-1974 Mercedes-Benz 280/280C/450SE/450SEL/450SL/450SLC & Subaru 1400 & Volkswagen 412
- 1973-1989 Subaru DL
- 1973-1975 Austin Marina
- 1973 Honda Civic
- 1973-1979 Audi Fox & Ferrari Dino 308 GT4
- 1974-1976 Renault R15
- 1974 Lancia Stratos & Mercedes-Benz 230
- 1974-1975 Nissan 260Z
- 1974-1978 Fiat 124
- 1974-1983 Fiat X-1/9
- 1974-1980 Volkswagen Dasher
- 1974-1979 Maserati Khamsin
- 1975-1979 Honda Civic & Nissan 620 & Subaru GF
- 1975-1977 Nissan 710 & Renault R12
- 1975 Nissan 610 & Renault R17
- 1975-1978 Fiat 131
- 1975-1984 Volkswagen Rabbit
- 1975-1983 Volkswagen Scirocco
- 1975-1980 Ferrari 308 GTB
- 1976-1996 Morgan Plus 8
- 1976-1987 Subaru Standard
- 1976-1992 Plymouth Colt
- 1976-1980 Plymouth Arrow
- 1976-1977 Mazda Mizer
- 1976 Lancia Scorpion
- 1976-1979 Lancia Beta & Lotus Eclat
- 1977-1982 Porsche 924
- 1977-1983 Nissan 200SX
- 1977-1980 Ferrari 308 GTS
- 1977-1985 Ferrari 512 BB
- 1977-1978 Mazda B1800/GLC
- 1978-1987 Subaru Brat
- 1978-1979 Dodge Challenger & Plymouth Sapporo & Renault R17
- 1978 Fiat Brava & Saab 99
- 1978-1981 Nissan 510
- 1978-1988 Audi 5000
- 1979 Lancia Zagato & Subaru FE
- 1979-1989 Subaru GL
- 1979-1982 Dodge D50 & Fiat Strada & Plymouth Arrow Pickup/Champ
- 1979-1984 Saab 900
- 1979-1986 Maserati Quattroporte
- 1980 Rover 3500
- 1980-1981 Morgan 46116 & Nissan 810
- 1980-1982 Subaru GLF
- 1980-1988 Porsche 911
- 1980-1986 Audi 4000 & Nissan 720
- 1980-1983 Nissan 280ZX & Volkswagen Rabbit Convertible/Rabbit Pickup
- 1980-1995 Lotus Esprit & Volkswagen Jetta
- 1980-1985 Ferrari Mondial 8
- 1981-1989 Isuzu I-Mark
- 1981-1992 Isuzu Pickup
- 1981-1982 Chevy LUV & Ferrari 308 GTBi/308 GTSi & Lancia Zagato
- 1981-1984 Nissan Maxima
- 1981-1987 Audi Coupe
- 1981 Lancia Beta
- 1982-1983 Nissan Stanza & Renault Fuego
- 1982-1985 Chevy S10 & Ferrari 308 GTB/308 GTS & GMC S15
- 1982-1988 Volkswagen Quantum
- 1983 Dodge Power Ram 50 & Plymouth Horizon/Turismo & Renault R18i
- 1983-1989 Dodge Ram 50 & Isuzu Impulse & Mitsubishi Starion
- 1983-1984 Chevy S10 Blazer & GMC S15 Jimmy & Nissan Pulsar NX
- 1983-1988 Mitsubishi Cordia/Tredia
- 1983-1996 Mitsubishi Mighty Max
- 1983-1986 Audi Quattro
- 1983-1985 Ferrari Mondial
- 1983-1987 Maserati Biturbo
- 1984-1988 Porsche 928
- 1984-1987 Audi 4000 Quattro & Buick Skyhawk & Ferrari GTO & Honda Prelude & Isuzu Trooper
- 1984-1986 Dodge Conquest & Plymouth Conquest
- 1984-1985 Pontiac J2000 Sunbird
- 1985-1988 Suzuki Forsa
- 1985 Pontiac Firefly & Suzuki SA310
- 1985-1989 Subaru GL-10/RX & Volkswagen Scirocco
- 1985-1991 Peugeot 505 & Porsche 944 & Subaru XT
- 1985-1987 Honda Civic & Renault Alliance
- 1985-1986 Honda Accord & Renault Encore & Volkswagen Cabriolet
- 1985-1992 Mitsubishi Mirage
- 1985-1995 Volkswagen Golf
- 1986-1994 Hyundai Excel
- 1986-1990 Pontiac Sunbird
- 1986-1988 Audi 5000 Quattro & Saab 900
- 1986-1989 Mitsubishi Montero & Nissan D21
- 1986-1987 Maserati 425/Spyder & Mazda 626
- 1987-1995 Subaru Justy
- 1987-1988 Chevy Spectrum & Nissan Pathfinder/Sentra & Yugo GVX
- 1987-1989 Chrysler Conquest & Pontiac Grand Am
- 1987-1992 Chevy Sprint
- 1987-1991 Pontiac Firefly
- 1987-1994 Mitsubishi Precis
- 1987-1990 Mitsubishi Van
- 1987-1993 Volkswagen Fox
- 1988 Audi 90 Quattro & Porsche 924 & Yugo GV/GVL/GVS
- 1988-1989 Dodge Raider & Honda Accord
- 1988-1991 Audi 80/80 Quattro/90 & Eagle Vista
- 1988-1993 Volkswagen Cabriolet
- 1989-1997 Geo Metro & Suzuki Swift
- 1989 Audi 100 Quattro & Chevy Tracker & Daihatsu Charade & GMC Tracker & Geo Spectrum/Tracker & Isuzu Amigo & Volvo 740
- 1989-1998 Hyundai Sonata
- 1989-1990 Dodge 2000 GTX & Maserati 228i
- 1989-1991 Audi 100/200/200 Quattro & Eagle Summit
- 1989-1992 Mitsubishi Galant
- 1990-1994 Plymouth Laser & Subaru Loyale
- 1990-1998 Eagle Talon
- 1990-1993 Geo Storm
- 1990-1999 Mitsubishi Eclipse
- 1990-1992 Volkswagen Corrado
- 1990 Maserati 430i/Spyder
- 1991 Audi 100 Quattro & Volvo 940
- 1991-1992 Hyundai Scoupe
- 1991-1993 Eagle 2000 GTX & Isuzu Stylus & Volkswagen Passat
- 1992-1993 Lada Niva/Samara/Signet & Porsche 968
- 1992-1995 Hyundai Elantra
- 1992 Chevy Metro & Mitsubishi Expo
- 1992-1996 Mitsubishi Diamante
- 1993-1995 Porsche 928
- 1993 Asuna Sunfire & Chrysler Daytona & Dodge Daytona
- 1994-2000 Pontiac Firefly
- 1995 Porsche 968
- 1998-2000 Chevy Metro
- 2002-2003 Morgan Plus 8
ACDelco R42XLS Notes:
- Verify vehicle application, position, and system configuration before installation.
Part TypeSpark Plug
BrandACDELCO
Package Height1.05
Package Width1.1
Package Length3.5
Weight0.085 PG
Hex TypeHex
Gap Size (Mm)0.89
Ground ConfigurationStandard
Center Electrode Core MaterialCopper
Reach (Mm)19.05
Center Electrode Insulator Tip Projection0.13
Ground Electrode Tip MaterialNickel
Product DescriptionACDelco Gold (Professional) Conventional Spark Plugs are a high quality alternative to Original Equipment (OE) parts. These conventional spark plugs are designed for reliability and efficient performance. They offer high-quality copper cores and outstanding suppression characteristics. They are also available for Marine applications. These premium aftermarket replacement spark plugs are manufactured to meet your expectations for GM fit, form, and function. ACDelco Gold (Professional) parts are manufactured to meet your expectations for fit, form, and function, making them a smart choice for General Motors vehicles, as well as most makes and models, including special applications. These high-quality parts are backed by General Motors. Some ACDelco Gold parts may have formerly appeared as ACDelco Professional. ⚠<b> WARNING:</b> Cancer and Reproductive Harm - www.P65Warnings.ca.gov
Approximate Resistor Value2-20k ohms
Center Electrode DesignStandard
Thread SizeM14 - 1.25
SkirtYes
Insulator MaterialCeramic
Core Nose Length0.54
Gap Size0.035 in (0.889 mm)
Part CategoryReplacement Parts
Resistor PlugYes
Pre-Gap Size0.89
Programming RequiredNo
Ground Electrode Quantity1
Washer TypeCrush
Signs Of Wear &#38; Troubleshooting - Section 1 - Bullet 1Your engine having trouble starting, hesitating, or cutting out
Faq - Answer 8Yes, ACDelco has marine spark plugs for many applications.
Signs Of Wear &#38; Troubleshooting - Section 1 - HeaderSigns of wear for spark plugs include but are not limited to:
Faq - Answer 7No, cleaning your old spark plugs is not recommended. Dirty, fouled spark plugs may also have broken or chipped insulator tips, worn electrodes, or worn or missing side wires. These conditions severely affect spark plug performance. Replace your dirty, fouled spark plugs with new ACDelco spark plugs.
Faq - Answer 6Yes, pre-ignition can cause serious damage to your engine. Pre-ignition is the ignition of fuel before the actual spark occurs, which causes a rapid temperature rise in the combustion chamber that can damage engine components and melt spark plug electrodes. Causes of pre-ignition include but are not limited to a buildup of deposits that can become incandescent in the combustion chamber, improper installation torque being applied to spark plugs, and having spark plugs with a heat range that is too hot for the engine's operating condition.
Faq - Answer 5Not always, but you should inspect your spark plug wires for wear when replacing your spark plugs. Refer to your vehicle owner's manual or contact the manufacturer for more information.
Faq - Answer 4Yes. When ACDelco spark plugs are manufactured, they are pre-gapped to the correct gap specification.
Faq - Answer 3A No, diesel engines do not use spark plugs.
Faq - Answer 2Yes, if it is the scheduled time for spark plug replacement. It is okay to replace one spark plug if it is fouled or damaged prior to scheduled maintenance, provided the source of the damage is found and corrected.
Faq - Answer 1Yes, this interval depends on what type of spark plug your vehicle requires. Refer to your owner's manual or contact your vehicle's manufacturer for more information.
Features &#38; Benefits - Bullet 6Manufactured to meet specifications for fit, form, and function for General Motors vehicles as well as most makes and models
Washer(S) IncludedYes
Seat TypeFlat
Insulator Height2.22
Center Electrode Tip MaterialNickel
Ground Electrode Core MaterialNickel
Features &#38; Benefits - Bullet 2Copper core provides great heat transfer and helps optimize plug durability
Features &#38; Benefits - Bullet 3Available for use in Marine applications
Resistor TypeYes
Features &#38; Benefits - Bullet 4Some ACDelco Gold parts may have formerly appeared as ACDelco Professional
Features &#38; Benefits - Bullet 5Premium aftermarket replacement part
Manufacturer Heat Range2
Features &#38; Benefits - Bullet 1Black Onyx coating helps reduce corrosion
Reach0.75
Ground Electrode Tip DesignStandard
Electrical Terminal TypeNon-Removable Nut
Faq - Question 8Does ACDelco have marine spark plugs?
Faq - Question 7Can I just clean my spark plugs instead of replacing them?
Height (In)1.12
Faq - Question 6What is pre-ignition and can it damage my engine?
Faq - Question 5When I replace my spark plugs, should I also replace my spark plug wires?
Signs Of Wear &#38; Troubleshooting - Section 1 - Bullet 2Lack of acceleration or loss of speed when driving uphill under load
Signs Of Wear &#38; Troubleshooting - Section 1 - Bullet 3Cracks in the upper or lower portion of the spark plug insulator
Signs Of Wear &#38; Troubleshooting - Section 1 - Bullet 4Chipped or broken insulator tips
Part FitmentDirect Fit
Faq - Question 4Are ACDelco spark plugs pre-gapped?
Faq - Question 3Do diesel engines use spark plugs?
Grade TypePremium
Faq - Question 2Should I change all of my vehicle's spark plugs at the same time?
Hex Size13/16 in
Faq - Question 1Is there a recommended interval for changing my vehicle's spark plugs?
Vendor Part NumberR42XLS
Package Qty1
Package TypeEA
No Questions
No Reviews
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