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


03geetee
09-23-2011, 01:23 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

Spork
09-23-2011, 01:37 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, 01:59 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, 03:37 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, 03:02 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, 03:12 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, 03:48 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.

my86craft
09-15-2017, 01:02 PM
Dumb question but are you guys talking marine specific oils or regular auto oil?

I found this - http://www.amsoil.com/shop/by-product/motor-oil/diesel/sae-15w-40-heavy-duty-diesel-and-marine-motor-oil/?zo=513524&page=%2fstorefront%2fame.aspx

mikeg205
09-15-2017, 02:27 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

Mobil 1 15w50 has the goods and a bit cheaper that VR1 Synthetic and good ZDDP - I too use the same additive - mine will be running today and tomorrow.

sorry yours is put away - time for the Hawks Jon!

bret
09-15-2017, 11:22 PM
The older ski show boats all ran 20W50. I run VR1 Racing, personal preference after tearing down Porsche turbo motors. Oil is very subject to your own opinion.

EGRAY
09-18-2017, 06:24 PM
15 40 all day!! no problem

06SUPERDUTY
09-18-2017, 06:33 PM
I run Mobil 1 15w-50 also but am concerned about the amount of zinc in the oil and will probably add some in the future, not sure what brand to use but any will be better than nothing, ran the same oil in my Sanger flat bottom for 12 hard seasons and was still running great when I sold it.
Any suggestions on what brand and where to purchase on the zinc, used to see it advertised a lot but not anymore?

kevinb2088
09-26-2017, 04:50 PM
My boat guy, 40+ yrs with ski boat mech exp has me using straight 40 in my '79 351W. Now two weekends ago I lost the head gasket but it was running perfect. I was and will still be using Rotella straight 40, he also likes Carquest (Now Advance Auto) straight 40... He has a customer book that swears by his work and I can't disagree. I also asked him about the Zinc additive and he said not worth the cost. Just my $.02 from him...

Blackhawk36
09-26-2017, 06:01 PM
I assume you only have low oil pressure when the engine is warmed up. My friend had an '87 stars and stripes with a 351W. Low pressure at idle when the engine was hot drove him crazy. We installed and engine oil cooler and the problem was gone forever. It did not come from the factory with one. Does yours?

88 PS190
09-26-2017, 06:36 PM
Blackhawk that's one of my dream modifications - remote mount an oil cooler and filter somewhere at the upper rear of the engine for easy/clean oil filter changes, more oil capacity etc.

On the '94 I've always thought that it would be cool to put it in the factory battery position next to the fuel tank. Lots of ventilation, hidden location and easy access to slide a pan under it and pull the filter. On the '88 above the transmission somewhere there seems to be a lot of room under the engine hatch.

ted shred
09-26-2017, 10:23 PM
For the last 15 years I've been using Amsoil 15/40 AME. Works great.

Blackhawk36
09-27-2017, 11:42 AM
Blackhawk that's one of my dream modifications - remote mount an oil cooler and filter somewhere at the upper rear of the engine for easy/clean oil filter changes, more oil capacity etc.

On the '94 I've always thought that it would be cool to put it in the factory battery position next to the fuel tank. Lots of ventilation, hidden location and easy access to slide a pan under it and pull the filter. On the '88 above the transmission somewhere there seems to be a lot of room under the engine hatch. The oil cooler we installed was just like the transmission oil cooler. In line with the raw water intake. There is an adapter plate for the 5.7" that mounts between the engine block and the oil filter. Simple install.