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Originally Posted by tjbell
premium gas is recommended for my car and many do not use premium when it is actually is recommended resulting in possible engine problems.
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Premium (92 PON) is recommended for my car as well, but I had been using regular (87 PON) for the past 3 years with no ill effects so far. The manual states that 87 is the lowest octane I can run without causing engine damage, so I assume the timing is altered to accept the lower octane fuel.
However, I'm currently running premium just to see if I notice an increase in fuel economy. So far I am, but it's also my first warm weather with a partial grill block installed, so the jury is still out on if premium makes a difference. I'll switch back to regular at some point and compare.
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as far as oil i am aware you can go near 10,000 on mobil one oil per change, i know used oil analysis shows 3,000 is nothing for mobil one. I am anal about 3,000 mile intervals. just the way i have always done it and how my father did it too. i can get synthetic oil for 4$ a quart for castrol 5w-30 synthetic. guess what, my car needs 0w-40 which at my cost is 7.65. it costs me 38.71$ for piece of mind. worth it to me
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I go 12,000 miles on Mobil 1 and a regular Purolator filter. The Blackstone reports have been good every year so far. I'd bet conventional cheap oil would do similarly well, but I haven't worked up the guts to try it yet.
3000 mi change intervals is excessive in all but the most severe of driving conditions. The dad or grandpa argument is an appeal to authority, and is meaningless to the facts of the matter.
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Originally Posted by freebeard
I change my oil based on its color and opacity, not miles driven. Is that wrong?
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I second the opinion of SoD. Color cannot be used to determine anything relevant (viscosity, acidity, contamination, TBN, etc) to oil. The oil in my diesel truck turns opaque almost immediately after a fresh change, but it continues to lubricate properly long after it has turned black.