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**Dan in Pasadena** · 04-01-2010, 11:20 PM

I'm no expert on the old engines but if it were mine I'd use a straight 30 wt. Like Castrol Heavy Duty.

04-01-2010, 11:20 PM	#2
Dan in Pasadena Senior Member Join Date: Nov 2008 Location: Glendora, CA Posts: 6,351	Re: Oil type for a stock 41 I'm no expert on the old engines but if it were mine I'd use a straight 30 wt. Like Castrol Heavy Duty.