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Old 04-12-2015, 06:18   #16
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Re: What oil grade?

I use Delvac I, a Mobile product, all reciprocating engines I own. It is a pure synthetic. Amsoil is the only other producer of pure synthetic oil. The remainder are derived from petroleum.

The pure synthetics are superior in every respect. Delvac I is formulated for diesel truck engines. A great write-up on synthetics below

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Old 04-12-2015, 13:36   #17
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Re: What oil grade?

Originally Posted by a64pilot View Post
RE 10W-40
I doubt it's Diesel oil, check the specs to be sure, but I bet it's spark ignition oil.
10W-40 is a very common car oil, never heard of a 10W-40 Diesel oil, but then of course I'm not in Croatia.
Google's your friend

Shell Helix HX7 Diesel 10W-40 - Shell Global

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Old 04-12-2015, 14:41   #18
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Re: What oil grade?

For my brand new Beta Marine 43 (Kubota) engine, the recommendation is 10W40 mineral or semi synthetic oil (max 30% synt), and synthetic oil is not advisable.

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