peter richards Posted July 20, 2018 Share Posted July 20, 2018 truck is due an oil change , ive got some fully synth , and some semi , both the same grade can I mix them mitsi l200 Quote Link to comment Share on other sites More sharing options...
Tyson Posted July 20, 2018 Share Posted July 20, 2018 From what I have read mixing oil can create hot spots in the engine due to different types of oil having different properties. Quote Link to comment Share on other sites More sharing options...
peter richards Posted July 20, 2018 Author Share Posted July 20, 2018 ok thanks Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted July 20, 2018 Share Posted July 20, 2018 They should be comparable being synthetic based, its just mineral that you shouldn't mix with synthetic, never heard of any hot spot scenario. Quote Link to comment Share on other sites More sharing options...
rider Posted July 21, 2018 Share Posted July 21, 2018 You can mix synthetic and semi synthetic oils as unless the cans actually says its based on ester or PAO, generally synthetic oil are just highly refined mineral oil to give it a low volatility because it is solvent refined to a narrower more uniform cut with the light (more volotile) bits removed. Even if the oil is Ester or PAO based they are miscible (mixable) the only potential issues then arise with additive package incompatibility between the different base oils could lead to a little bit of sediment forming of usually the carbonate variety (which is a abrasive solid) so although your oil filter will take care of it its not ideal. If you want to conduct a oil industry sediment test on the oils mix the two oils 50:50ml and have two 100:0 controls and stand in jam jars in the dark at room temperature for 4 weeks and see if any grey sediment forms at the bottom of the jar. If no sediment forms in the mixed then you have two perfectly compatible oils. If you do get sediment in the mix then check the two controls. This test would of course require that you don't need to change the oil any time soon. Quote Link to comment Share on other sites More sharing options...
peter richards Posted July 21, 2018 Author Share Posted July 21, 2018 ok thank you Quote Link to comment Share on other sites More sharing options...
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