I have seen several marine engine failures even with roller lifters! Took apart a 28K mile 1 ton van motor (5.7 SBC) with two scuffed roller lifters! Internal engine parts had no signs of sludge. The removal of zinc additives from conventional motor oils (by request of the EPA & done by all lube oil producers) IS THE MAJOR CAUSE OF CAMSHAFT & LIFTER FAILURE. Go to Speed Talk and read in their pages about the tremendous number of camshaft & lifter failures in the past 7 years or so. I am very an*l when it comes to maintenance on my boat (and truck) and want my investment to last a long time. Will running straight 30W have any effects on the engine for those days I just want to go for a long ride and the engine is at 3000rpm for an hour or so? Sorry for all the questions, but I just want to do this right. I try to use my kicker as much as possible, but there are some days the main engine has to do all the work for 6-8 hours at a time. After thinking about it, extending the OCI on the engine is probably not a good idea in a trolling application as you mentioned. So, yeah, I'm probably out of that warranty claim liability now.

I bought the boat with 10 hours on the new drivetrain 4 years ago.

The previous owner of the boat had to replace the engine and outdrive after failing to winterize the boat. I am fairly sure my warranty has expired. Take good care of your equipment and it will perform properly.īorderline, lots of great info there. after you send the engine back and they have time to inspect it.Days turn into weeks & more while you sit on the dock. This was done several years ago and we HAVE BEEN seeing roller lifter failures since Submitted.Jet Boat Bill.Jasper Engines honors their warranties. The EPA requested the removal of all zinc additives to protect cat. Like Comp Cams Break-in additive and others that are based on the zinc compounds. That's where you need it! The biggest positive change would be to use a specific additive at change time. 20W50 will work fine in most trolling boats, but Straight 30W will have slightly higher oil pressure (hot) at Idle! Approx 3 to 5# more. Change the oil often is better than all the paper warranties. No engine oil cooler on the majority of the I/O boats causes more problems with heavily loaded trolling boats. Internal Condensation & long periods of sitting unused are your problems. Extending the change interval will be a detriment.

Did you ask Mercruiser people how long the warranty period is for pleasure boat operation.or commercial operation? 30 Days on the people using their boats for Charter Operation.The local Rep can make a warranty decision and you will be stuck with it.As to using synthetics in marine/trolling applications, I do not see a benefit.

Mercruiser inboard oil