jwmcgregor Posted February 4, 2019 Share Posted February 4, 2019 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! Quote Link to comment Share on other sites More sharing options...
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