Subaru XT 1988 Service Manual page 772

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SERVICE DATA
CONVENTIONAL SUSPENSION
Front strut
Piston rod deflection
AIR (PNEUMATIC) SUSPENSION
Recommended grease
Recommended O-ring
SUSPENSION
15
Limit 0.8 mm (0.031 in)/20 N (2 kg, 4 Ib)
NOK 5EALUB 5-4
NOK material; A980
4-1