Just wondering what the preferred brand was for you fellas running the larger Merc V-6s. I see that Quicksilver makes quite a few brands. I was talking with a buddy of mine that has a Tracker 90 horse and he absolutely won't buy any of the Quicksilver brands due to the price. I thought that paying for the quality would be worth more than a rebuild or having to burn a tax refund on a motor off the rack! Anybody ever use the QS Synthetic oil? I have an old '88 135 in great shape and plan on running the QS brand, just curious as to some of your feedback. thanks for your time.