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oil and lucas Oil Stabilizer
i have a 89 sierra with a 350 , i was using castrol 20w-50 with lucas oil stabilizer . do you think that is to thick to use or should i go down to 10w-40 and lucas oil. its been running fine , if not better with the 20w-50 .it will smoke on start up and on take off if i use any thing less than 10w-40. thanks
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