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Every year, prior to winter hibernation:
987S Every 5-7,000 miles. First 4 years used Red Line 5W40. Now running Mobil 5W50 (hard to find oil). Blackstone UOA's are excellent.
993TT Every 5,000 miles. Running Mobil 1 V-Twin 20W50 (yes, a motorcycle oil). UOA's are also excellent.
*Chevron Techron Fuel System Cleaner prior to oil change.
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