Capt. Chaos wrote:
Just finished my first weekend of boating. Woo hoo. Lots of fun.
Maneuvering around the marina is a lot harder than it looks though. I
don't think the brakes on my boat work.

I need to change the oil in both the motor and outdrive. The previous
owner said he used synthetic. I've always run conventional oil in all my
machines, mostly cars and motorcycles with the practice of changing the
oil frequently. This practice has never failed. With the cost of
synthetic, I'd rather stick with conventional.
The motor is a 350. I was planning on using 10-40. Any problems with
this? Any other recommendations?
OMC Cobra outdrive. I have no idea what oil to use in this or how much?
Any problems either with the motor or outdrive going from synthetic back
to conventional?
The only problem I've experienced with the boat is that shifting between
foward, neutral, and reverse is a little bit harsh. I'm not sure if that
is normal since I've never driven any other boat before and have nothing
to compare it too. It goes into gear okay, but you have to use a fair
amount of force to do so. Boat is an '89 Dynasty runabout.
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I have a '88 OMC Cobra with the 305 Chevy engine and it would be the
same block that you have, except that yours would be bored out to 350
CID. Keep in mind that OMC also used the 351 Ford engine for the 5.7
outdrives. My manual calls for HD 30 weight motor oil. I've always
used Pennzoil HD 30 and had no problems.
That vinatage Cobra had an inborn problem with the shifting cable. OMC
authorized a free replacement cable to original owners. I had the
dealer install the new cable and I still had occasional shifting
problems. Then, I took it to an independant mech. for other work and
while he was at it, he re-adjusted all the linkage and its been smooth
as glass ever since.