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Recently bought this Duramax. Changed the oil when the maintenance reminder came on in the dash. Unknown oil and unknown interval from previous owner. No visible signs of coolant system issues. Upper radiator hose is not hard. No bubbles or soot in overflow tank. Has not used any coolant in...

Honda Civic with the R18Z1 engine and 5MT. Curious to get your guys thoughts on the oil itself and the change interval. I have included below some of the information I have been able to find on honda MTF vs Amsoil and Redline MTL used in a honda SI. Thanks -------------Below here is not...

Overall I'm happy, but curious what you guys think of the TBN 2.1 seams low compared to the Mobil 1 I ran before. Also phosphorus and zinc seam high to me when I compare this to other UOA of Rotella gas truck. Thanks

Honda Civic 2014 r18z1 Engine 3.7 qt sump w/out filter change (does not have direct fuel injection) Mobil 1 5w20 EP Honda OEM oil filter (manufactured by Honeywell?) I choose 5w20 because according to mobile the 0w20 EP has 650ppm phos and 750ppm zinc and the 5w20 EP has 800ppm phos and...