It's up to you of course, but if you want the best protection currently available then fully synthetic is the way to go. There is stacks of information on this subject, do a search of 'Oilmans' postings.merc230ce said:i have a merc 230ce 96k mileage, due for service, which oil should i use, mineral, zetec or semi synthetic??
merc230ce said:i have a merc 230ce 96k mileage, due for service, which oil should i use, mineral, zetec or semi synthetic??