If you changed your oil every 5k with Mobil1 AFE 0w-30 & a Napa gold like myself, I spend $28-$30 per change, that's at least $84 a year more or less.
One change of Amsoil SSO 0w-30, even if I have to buy a 5th Q in case I burn oil off, amounts to $68.50 before shipping. $10.50/Q and $16 for the filter. So, if you go just 15k with that oil, rated for 17.5k in severe or as much as 35k normal, you will still be saving money compared to the $84. |
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GM uses a monitoring system that monitors the breakdown of the oil, not just the milage with a dummy light He's wrong, it's neither of those. GM's system monitors engine data that is already normally collected, and uses that to infer oil breakdown. It is quite effective without needing additional oil sensors but can't account for contamination. It doesn't directly monitor breakdown of the oil. I've found it to be good enough. Chrysler uses a system with an actualy oil quality sensor, or did and I assume that they still do. |
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A couple weeks ago I looked up Warren's 5w-30 trying to get a bead on what Wal-mart's stuff is. It is close, maybe a little thinner, to 0w-30 Mobil is viscosity. |
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In at least 2002-2008 GM definitely used the system I described. If it has changed, it would be in the last year or two.
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