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Old 04-28-2013, 03:25 PM
kman kman is offline
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L18 Oil

What oil is everybody running in their 8.1 liters?

Ran several searches and can't find anything about oil or filters for the 8 liter. I found a sticker on the intake that says to use straight 40w and was wondering what everyone was using.
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Old 04-29-2013, 08:47 AM
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15/40 wt

http://www.indmar.com/service-suppor...2003-2005.aspx
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Old 04-29-2013, 11:55 AM
kman kman is offline
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Thanks CantRepeat, however, now I'm more confused. I found the Mastercraft owners manual online, and it shows straight 40w also. So Indmar says 15w40 and Mastercraft says 40w. hhmmm.
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Old 04-29-2013, 12:37 PM
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I'd go with Indmar...... it's their engine.
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Old 04-29-2013, 01:14 PM
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I would call Indmar, they might have updated. I've used straight 50W per Indmar for 8.1 before.
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Old 04-29-2013, 01:56 PM
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Updated says 40 wt and you should increase to 10 qts.
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File Type: pdf SV2006-2 8.1L Oil Level REV.pdf (16.7 KB, 102 views)
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Old 04-29-2013, 02:32 PM
kman kman is offline
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I emailed Indmar and they sent me the advisory regarding the switch to 40w. So, now the problem is where to get it?
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Old 04-29-2013, 08:11 PM
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Quote:
Originally Posted by kman View Post
I emailed Indmar and they sent me the advisory regarding the switch to 40w. So, now the problem is where to get it?
Any of your local oreilly, advanced auto, even west marine has Pennzoil sae 40
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Old 04-30-2013, 05:12 PM
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I have done a lot of research on the L18 and had a few conversations with Indmar engineers along with marine engine builders. Indmar changed their oil requirement to straight 40 wt. because folks weren't checking their oil levels during the summer and the L18 will use some oil and the switch was to help prevent the slight oil usage. I feel, and so do some of the engineers at Indmar that 15-40 is better and just check your oil more often. The GM 8.1 has a 8 quart oil pan but Indmar states 10 quarts once again because folks fail to check their oil level during the summer and the level drops and Indmar wanted the extra oil for safety.

After all that babble - just run 8-10 quarts of 15w-40 and check your oil level often.
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