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 https://www.bigmacktrucks.com/topic/55493-engine-oil-wt/ Share on other sites More sharing options...
fjh Posted February 4, 2019 Share Posted February 4, 2019 We have been using 15/40 with no issues for 10 years right up till this last year ! 10/30 is just starting to be more popular! Quote Link to comment https://www.bigmacktrucks.com/topic/55493-engine-oil-wt/#findComment-414882 Share on other sites More sharing options...
JoeH Posted February 4, 2019 Share Posted February 4, 2019 If you're in Texas I'd stick with 15/40, if you're in Alaska I'd go with 10/30 because of difference in climate temperatures. Quote Link to comment https://www.bigmacktrucks.com/topic/55493-engine-oil-wt/#findComment-414883 Share on other sites More sharing options...
Mack Technician Posted February 4, 2019 Share Posted February 4, 2019 (edited) The lightest we’d run is 10W-40. We can park 75% of trucks and off road equipment indoors so we generally use heavy oil, mostly Mobil 1300 15W-40. All 4 of our D13's are running 15W-40. Edited February 5, 2019 by Mack Technician Quote Link to comment https://www.bigmacktrucks.com/topic/55493-engine-oil-wt/#findComment-414884 Share on other sites More sharing options...
HeavyGunner Posted February 4, 2019 Share Posted February 4, 2019 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. Quote 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. Link to comment https://www.bigmacktrucks.com/topic/55493-engine-oil-wt/#findComment-414887 Share on other sites More sharing options...
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