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Engine oil wt


jwmcgregor
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We've been putting 15-40 in our small fleet of MP8's.  Purchased used. No decal stating otherwise and thought nothing of it.  Purchased a VNL with D13 and sticker says 10-30.  Research says synth due to added heat in newer engines.   Is anyone running 15-40..is it a real issue?  Is synth 5-40 an option...It would be more versatile oil for us to use.

Thanks! 

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We run synthetic, it’s either 05-40w or 0-40w my memory isn’t working. Trucks start a helluva lot easier in subzero temps with that light oil. Run synthetic in all of the gear boxes as well. 

The problems we face today exist because the people who work for a living are outnumbered by the people who vote for a living.

The government can only "give" someone what they first take from another.

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