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View Full Version : Oil Viscosity/Weight question...80s PCM 351s...


03geetee
09-23-2011, 12:23 PM
No no no not one of those oil threads trust me.

Found out later in the season that my marina uses 30W in thier normal routine winterizations. This was not music to my ears since I noticed my idle oil PSI was a little low for my liking. I am going to winterize the boat this weekend so I wanted to see what you guys thought....

I was thinking a Rotella 15/40 but I know my manual says 10/30. What weight have you guys ran with success? I use the boat from Memorial day to Labor Day sometimes a little later so its never really that cold.

Thanks for any information.

JTR

j.mccreight@hotmail.com
09-23-2011, 12:37 PM
10w30 mobil 1 (900 zddp) in my 89 indmar 351w mostly because I get a discount at my shop, no problems, my manual says 30w.

Patrick Hardy
09-23-2011, 12:59 PM
In fifteen years of owning my 190, I have only used 15w40 - numerous brands. I ski / use boat almost year round. Never had any type of problem

east tx skier
09-23-2011, 02:37 PM
You want something with the correct amount of zddp for your flat tappet Ford. I have a PCM Ford and run 20W50 in it with no problems in this climate. 15W40 would be fine, but get something that still has enough Zinc. Rotella does not.

03geetee
09-24-2011, 02:02 PM
Got a bottle of Zinc additive and some rotella 15w40 boat is winterized.

I haz a sad.

At least I can play on the seadoo today and with this cool weather I should be able to hit 66-67mph before I pull that out for good tonight.

JTR

tommcat
09-24-2011, 02:12 PM
i like valvoline VR1 or royal purple for brand name, they both have a sufficient amount if zinc for your cam, as do most oils labeled "racing". 10/30 or 15/40 would both be good choices for weight and it would really be personal preference.
straight 30 weight does not belong in there, no idea why the marina would have put that in.

east tx skier
09-24-2011, 02:48 PM
i like valvoline VR1 or royal purple for brand name, they both have a sufficient amount if zinc for your cam, as do most oils labeled "racing". 10/30 or 15/40 would both be good choices for weight and it would really be personal preference.
straight 30 weight does not belong in there, no idea why the marina would have put that in.

In the VR, 20W50 is the best you'll do on the multiweight IIRC. That's what I have in my PCM Ford. I believe SAE 30 was originally recommended for the engine (I know it was for my 93), but I feel more comfortable with a multiweight for startup.