View Full Version : switching from penzoil to mobil1 syn

canada air
09-13-2004, 10:38 AM
my 95 maristar 350tbi presently has 15w40 penzoil in it. it has 400hrs on it and was wondering if switching to mobil 1 15w50 syn will prolong engine life(changed every 50 hours)

am i asking for new problems(oil consumption or oil leaks). i have no idea what previous owner ran

09-13-2004, 11:13 AM
I don't know how much it would prolong the motor life, it's not averaging 50 hours per year now. I have been told that the viscosity modifier shouldn't be more than 30. However if the oil meets the requirements for marine application, it should be OK. Do a search for oil topics here and on the old site- it was discussed previously, along with oil filters.

The best thing to do, other than regular maintenance, is use oil that meets the requirements, keep the oil and filter clean, don't overheat it and use good, clean gas.

MC and Indmar recommend and use Pennzoil 15W40 in their motors.

09-13-2004, 12:06 PM
at 600 hrs - my 95 190 needed to be torn down due to an "unfortunate incident"... pls don't ask.

Anyway - my motor (except for the limited damaged parts) looked new. I saw it first hand... New - not lightly used - but new. I run Penzoil & change every 100 hrs. I probably should be changing every 50 - but don't quite get to it till 100.

just my .02.... Nothing wrong with the Penzoil.

canada air
09-13-2004, 12:19 PM
thanks i think i will just stick with the penzoil

Farmer Ted
09-13-2004, 12:29 PM
What's the scoop? Boat damage or engine?

09-13-2004, 03:01 PM
jimmer- you brought it up, but,.....

Nobody likes to tell when they do something worng, but if it helps someone else avoid the same thing, you'll be doing a favor.

09-14-2004, 06:12 AM
There were a string of boats & equipment (loaders, backhoes) that in a single weekend lost all their oil. Amazing.

The moral of the story is... even though your boat doesn't use any oil - check it each & every time you go out.:mad:

09-14-2004, 09:09 AM
So, assuming it was vandalism, did you claim it on your insurance and report it to the po-lice?

09-14-2004, 09:22 AM
nope - since we couldn't prove anything. Lesson learned on my part.

09-14-2004, 05:08 PM
As Jimn stated any apporoved motor oil will protect an engine well for a very, very long time when changed at the proper intervals.

My first car (story time here) was an '83 Trans Am. I used "Cumberland Farms XP Lube" ($.89.qt) oil in it, but changed it every 3k religiously. I beat on that car, drag raced it, TOWED MY BOAT with it, drove it across country and back three times, over heated it mercilessly, and repeadedly, and finally sold it with 200,000 miles having never cracked it open. It still ran perfectly (15.3 in the 1/4 mile, 24 MPG on the highway, and didn't burn any oil at all). The friend I sold it to, sold it, (still running flawlessly) w/230k and last I heard it had 245k was still runnign great, but had finally blown a head gasket(not oil related). Point is, interval is WAY more important than oil brand (as long as the oil meets the requirements)

Dispite that, I run Mobil 1 synthetic, 5W30 in my '92 PS 190. I still change it every 50 hours, even though I don't have to. Why? It IS better oil. The addative package will hold up better, it can take heat better, and it does reduce friction some(better economy and power though MINIMAL). And w/a boat 50 hours is what, once a year? Well I do it twice, once in the spring and once in the fall, to reduce the chance of condensation, but the price difference per year, is about $15.00. I can afford $15.00 a year for the benefits of synthetic oil. Plus when (if) I ever sell the boat, I think that is a value improving point. Internally, my motor will literally be LIKE NEW, when it has 1000 hours on it.

To the original poster, if you have no leaks now, and no oil consumption, that will not change with a switch to synthetic.