Thread: 10-40 or 20-50 oil ???
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Old 06-01-2015, 03:45 PM
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Cobra Make, Engine: AK1085 (302 Street), HTM111 (427 Comp), CSX2375R (289 Comp) and COB5999 (427 S/C)
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Don't second guess. Sounds right.
I have a solid lifter 289.
Important that it's not overdone is all.
Zinc = lubricant to soften blow
Flow is 5 or 10-40 part.
20-50 builds pressure etc that may not benefit motor.
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