I do mine twice yearly, regardless of mileage. For winter, I set both the exhaust and intake valves an additional 5: intake from 10 to 15; exhaust from 30 to 35. Return to book for summer Helps compensate for the gradual wear on my engine with 170k miles. Be sure your timing chain and tensioner are in good condition. How may miles on your engine since they were last replaced? Doug.
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Douglas
1959 M-B 220S cabriolet
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