John, stay with what you have right now. Deciding what oil to use should be right in the beginning. Oil seals change density and size after using one kind of oil for a long period of time and than switching to another. If it does change there can now be an oil leak where you had none before. The percentage of change can be over 3 per cent. What happens is when the actual change finally completes, the seal can break and never re-seal. ..........................bob
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