Oil weight?

[JakeyBaby]

What is the most recommended oil weight to use for summer time trolling? I have a 350 small block, I want to say I was told straight weight 40 before but can't remember......

Edited May 12, 2015 by JakeyBaby

[devoknevo]

I run straight 30W in my 350 chevy. 

[dvdegeorge]

Straight 30W in my 270 Crusader(350 chevy)

[Xxx]

I run the Shell Rottella strait 40 in my 350 mercruiser

[rod hog]

25w40

[jimski2]

Seventy per cent of engine wear is on start up where the fresh oil needs to get there fast. 10w30 has thinner oil that wears like 40 weight but gets to the cylinders faster than 40 weight. Unless you have a prelude system the multi weight oil is what you want.

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[Silver Fox]

Why don't you ask the expert marine mechanic at east fork marina, where you keep your boat?.......lol

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[JakeyBaby]

I've been bugging him way to much lately! Lol

[W.W.IV.]

Seventy per cent of engine wear is on start up where the fresh oil needs to get there fast. 10w30 has thinner oil that wears like 40 weight but gets to the cylinders faster than 40 weight. Unless you have a prelude system the multi weight oil is what you want.

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I ran 40weight in my 302s to keep the oil presure up at troling speed.(low rpms)never had a problem with them.

[jimski2]

It is the first few moments during start up when the cold 40 weight oil fails to reach the wear points of the engine. Nascar engines use 0w50 weight oil, though expensive, they get quick lubrication and less windage and friction to achieve higher power.

[slow rollin]

The W does not mean (weiight) The lower the # after the w means better oil function at low temperature.

[GAMBLER]

I've been bugging him way to much lately! Lol

He puts straight 30w in my boat Matt.

[lrg355]

From the AMSOIL website

"OK . . .What does a 5W-30 do that an SAE 30 won't?

When you see a W on a viscosity rating it means that this oil viscosity has been tested at a Colder temperature. The numbers without the W are all tested at 210° F or 100° C which is considered an approximation of engine operating temperature. In other words, a SAE 30 motor oil is the same viscosity as a 10w-30 or 5W-30 at 210° (100° C). The difference is when the viscosity is tested at a much colder temperature. For example, a 5W-30 motor oil performs like a SAE 5 motor oil would perform at the cold temperature specified, but still has the SAE 30 viscosity at 210° F (100° C) which is engine operating temperature. This allows the engine to get quick oil flow when it is started cold verses dry running until lubricant either warms up sufficiently or is finally forced through the engine oil system. The advantages of a low W viscosity number is obvious. The quicker the oil flows cold, the less dry running. Less dry running means much less engine wear

[lrg355]

The problem with multi viscosity oils is the addatives necessary to perform the task at different temps are the main culprits in forming sludge. 

[Wolfhound]

I use 30 W with a Zinc additive for wear Like Penn Can  or Valvoline racing oil....This is what my engine builder recommended.

[Chas0218]

if you went with 10w-40 diesel oil it has the additives and also allows for good lubrication at start-up.