2007-07-25 20:16:45 · 3 answers · asked by John Patrick Soler 1 in Cars & Transportation ➔ Maintenance & Repairs
Sorry, but that makes no sense. At high temperature, the oil should be pretty much the same viscosity, and at lower temperatures it should be a thinner oil. It sounds like there is something else going on.
2007-07-25 20:22:11 · answer #1 · answered by Fred C 7 · 0⤊ 0⤋
The answer relates to the viscosity index
To try and explain in simple terms The SAE 40 oil will be thinner than the 15w/40 at engine operating temperatures (about 80oC) also important is the API of the oil you are using . Late model cars should have API of at least a SL or SM
2007-07-26 04:02:18 · answer #2 · answered by Duigan 3 · 0⤊ 0⤋
You have something else going on with your engine. There is no difference with the oil you are using. With multi viscosity oils like the 15W-40 the "W" stands for winter. It acts as a 15 weight oil at startup, and then it acts as a 40 weight oil when it reaches normal operating temperatures.
2007-07-26 04:52:16 · answer #3 · answered by bobby 6 · 0⤊ 0⤋